Sprouto/rdsap10 huggingface dataset:
20 RDSAP10-SPECIFIC METRICS
20.2 Carbon Dioxide emissions and Primary Energy in RdSAP10
|  wood chips |  | 3.07 | 0.023 | 1.046 | 21  |
|  dual fuel appliance (mineral and wood) |  | 3.99 | 0.087 | 1.049 | 10  |
|  Electricity: ${ }^{(h)}$ |  |  |  |  |   |
|  standard tariff | 54 | 13.19 | $0.136^{(x)}$ | $1.501^{(t)}$ | 30  |
|  7-hour tariff (high rate) ${ }^{(h)}$ | 24 | 15.29 | $0.136^{(x)}$ | $1.501^{(t)}$ | 32  |
|  7-hour tariff (low rate) ${ }^{(h)}$ |  | 5.50 | $0.136^{(x)}$ | $1.501^{(t)}$ | 31  |
|  10-hour tariff (high rate) ${ }^{(h)}$ | 23 | 14.68 | $0.136^{(x)}$ | $1.501^{(t)}$ | 34  |
|  10-hour tariff (low rate) ${ }^{(h)}$ |  | 7.50 | $0.136^{(x)}$ | $1.501^{(t)}$ | 33  |
|  18-hour tariff (high rate) ${ }^{(h)}$ | 40 | 13.67 | $0.136^{(x)}$ | $1.501^{(t)}$ | 38  |
|  18-hour tariff (low rate) ${ }^{(h)}$ |  | 7.41 | $0.136^{(x)}$ | $1.501^{(t)}$ | 40  |
|  24-hour heating tariff | 70 | 6.61 | $0.136^{(x)}$ | $1.501^{(t)}$ | 35  |
|  electricity sold to grid, PV |  | $13.19^{(t)}$ | $0.136^{(x)}$ | $0.501^{(t)}$ | 60  |
20 RDSAP10-SPECIFIC METRICS
20.2 Carbon Dioxide emissions and Primary Energy in RdSAP10
|  24-hour heating tariff | 70 | 6.61 | $0.136^{(x)}$ | $1.501^{(t)}$ | 35  |
|  electricity sold to grid, PV |  | $13.19^{(t)}$ | $0.136^{(x)}$ | $0.501^{(t)}$ | 60  |
|  electricity sold to grid, other |  |  | $0.136^{(x)}$ | $0.501^{(t)}$ | 36  |
|  electricity, any tariff ${ }^{(j)}$ |  |  | $0.136^{(x)}$ | $1.501^{(t)}$ | 39  |
|  Heat networks: ${ }^{(k)}$ | $120^{(l)}$ |  |  |  |   |
|  heat from boilers - mains gas |  | 4.24 | 0.210 | 1.130 | 51  |
|  heat from boilers - LPG |  | 4.24 | 0.241 | 1.141 | 52  |
|  heat from boilers - oil (assumes 'gas oil') |  | 4.24 | 0.335 | 1.180 | 53  |
|  heat from boilers that can use mineral oil or biodiesel |  | 4.24 |  | 1.180 | 56  |
|  heat from boilers using HVO from used cooking oil |  | 4.24 |  | 1.180 | 57  |
|  heat from boilers FAME from animal/vegetable oils ${ }^{(e)}$ |  | 4.24 |  | 1.180 | 58  |
|  heat from boilers - B30D ${ }^{(f)}$ |  | 4.24 | 0.269 | 1.090 | 55  |
20 RDSAP10-SPECIFIC METRICS
20.2 Carbon Dioxide emissions and Primary Energy in RdSAP10
|  heat from boilers FAME from animal/vegetable oils ${ }^{(e)}$ |  | 4.24 |  | 1.180 | 58  |
|  heat from boilers - B30D ${ }^{(f)}$ |  | 4.24 | 0.269 | 1.090 | 55  |
|  heat from boilers - coal |  | 4.24 | 0.375 | 1.064 | 54  |
|  heat from electric heat pump |  | 4.24 | $0.136^{(x)}$ | $1.501^{(t)}$ | 41  |
|  heat recovered from waste combustion |  | 4.24 | $0.015^{(p)}$ | 0.063 | 42  |
|  heat from boilers - biomass |  | 4.24 | 0.029 | 1.037 | 43  |
|  heat from boilers - biogas (landfill or sewage gas) |  | 4.24 | 0.024 | 1.286 | 44  |
|  heat recovered from power station |  | 2.97 | $0.015^{(p)}$ | 0.063 | 45  |
|  high grade heat recovered from process (Appendix C4.3) |  | 2.97 | 0.011 | 0.051 |   |
|  low grade heat recovered from process (Appendix C4.4) |  | 2.97 | $0.136^{(x)(v)}$ | $1.501^{(x)(v)}$ |   |
|  heat recovered from geothermal or other natural processes |  | 2.97 |  | 0.051 | 46  |
20 RDSAP10-SPECIFIC METRICS
20.2 Carbon Dioxide emissions and Primary Energy in RdSAP10
|  heat recovered from geothermal or other natural processes |  | 2.97 |  | 0.051 | 46  |
|  heat from CHP |  | 2.97 | as above ${ }^{(q)}$ | as above ${ }^{(q)}$ | 48  |  
| Fuel | Standing <br> charge, <br> $\mathbf{f}^{\text {(a) }}$ | Unit <br> price <br> $\mathbf{p} / \mathbf{k W h}$ | Emissions <br> $\mathbf{k g ~ C O}_{2}$ <br> per $\mathbf{k W h}^{\text {(b) }}$ | Primary <br> energy <br> factor | Fuel <br> code |
| :-- | :--: | :--: | :--: | :--: | :--: |
| electricity generated by CHP |  | N/A | See Table 12f |  |  |
| electricity for pumping in distribution network |  | N/A | $0.136^{(c)}$ | $1.501^{(c)}$ | 50 |
| Fuel from PCDB ${ }^{(a)}$ | Data for each field comes from PCDB table |  |  |  | 99 |
| Energy Cost Deflator ${ }^{(e)}=0.42$ |  |  |  |  |  |
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
(a) The standing charge given for electric off-peak tariffs is the extra amount, over and above the amount for the standard domestic tariff.
For calculations including regulated energy uses only (e.g. regulation compliance, energy ratings):  
- The standing charge for electricity standard tariff is omitted;
- The standing charge for off-peak electricity is added to space and water heating costs where either main heating or hot water uses off-peak electricity;
- The standing charge for gas fuels is added to space and water heating costs where the gas fuel is used for space heating (main or secondary) or for water heating.
For calculations inclusive of unregulated energy uses (e.g. occupancy assessment):
- The standing charge for electricity standard tariff is included in all cases;
- The standing charge for off-peak electricity is included in addition if an off-peak tariff applies;
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
- The standing charge for electricity standard tariff is included in all cases;
- The standing charge for off-peak electricity is included in addition if an off-peak tariff applies;
- The standing charge for gas fuels is included where the gas fuel is used for any calculated energy use.  
The unit price used for 'electricity exported to grid' is the 2020 wholesale electricity price taken from Annex M of
'Projections of greenhouse gas emissions and energy demand from 2016 to 2035', existing policies scenario. (It is not based on the export rate used for the Feed in Tariff or similar incentive schemes.)
(b) These are $\mathrm{CO}_{2}$ equivalent figures which include the global warming impact of $\mathrm{CH}_{4}$ and $\mathrm{N}_{2} \mathrm{O}$ as well as $\mathrm{CO}_{2}$. Figures for specific heat networks may be included in the Product Characteristics Database.
(c) https://epr.ofgem.gov.uk/Content/Documents/National\%20Grid\%20Gas\%20Plc\%20-
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
(c) https://epr.ofgem.gov.uk/Content/Documents/National\%20Grid\%20Gas\%20Plc\%20-
\%20Special\%20Conditions\%20Consolidated\%20-\%20Current\%20Version.pdf (see pages 284-287).
(d) For appliances that specifically use bio-liquid HVO to BS EN 15940 certified as wholly derived from waste/used cooking oil
(e) For appliances that specifically use bio-liquid FAME to BS EN 14214 certified as wholly derived from waste animal fats/used cooking oil
(f) For appliances that specifically use a blend of $30 \%$ bio-liquid FAME (e) and $70 \%$ kerosene (B30K) or $70 \%$ gas oil (B30D)
(g) The specific fuel should be assumed for those appliances that can only burn the particular fuel (including Exempted Appliances within Smoke Control Areas).
Where a main heating appliance is classed as dual fuel (i.e mineral and wood), the data for dual fuel should be used, except where the dwelling is in a Smoke Control Area, when the data for solid mineral fuel should be used.
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
Wood should be specified as fuel for a main heating system only if there is adequate provision (at least $1.5 \mathrm{~m}^{3}$ ) for storage of the fuel.
Outside Smoke Control Areas an open fire should be considered as dual fuel, and a closed room heater without boiler if capable of burning wood as burning wood logs.
(h) With certain appliances using an off-peak tariff, some of the consumption is at the low rate and some at the high rate. The high-rate fractions to be used are given in Table 12a in SAP10.2, the remainder being provided at the low rate.
(i) Deducted from costs, emissions or primary energy
(j) This code is used to define the fuel for any electric system. Other codes for electricity are to provide cost data, depending on the applicable electricity tariff.
(k) Cost is per unit of heat generated (i.e. before distribution losses); emission and primary factors are per unit of fuel used by the heat generator.
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
(k) Cost is per unit of heat generated (i.e. before distribution losses); emission and primary factors are per unit of fuel used by the heat generator.
(l) Include half this value if only DHW is provided by a heat network
(m) Based on the mix of petroleum products used to generated heat in the UK (predominantly diesel).
(n) Value for non-domestic coal
(o) Based on the mix of biomass sources used to generate heat in the UK.
(p) Takes account of the reduction in electricity generation that occurs where heat is produced at a high enough temperature to supply a heat network.
(q) Use factor for heat network with boilers according to fuel used.
(r) An energy cost deflator term is applied before the rating is calculated. It will vary with the weighted average price of heating fuels in future so that the SAP rating is not affected by the general rate of fuel price inflation. However, individual SAP ratings are affected by relative changes in the price of particular heating fuels.
Notes to Table (wording of the notes copied from notes to Table 12 in SAP10.2):
(s) $\mathrm{CO}_{2}$ factors for grid electricity vary by month. The average figure given in this table is therefore not used directly. Instead the monthly factors given in Table 12d in SAP10.2 should be used in the SAP worksheet.  
(t) PE factors for grid electricity vary by month. The average figure given in this table is therefore not used directly. Instead the monthly factors given in Table 12e in SAP10.2 should be used in the SAP worksheet.
(u) This allows the possibility of adding new fuels between major updates of SAP. Supplementary guidance may be issued when new fuels are added explaining how they are used in SAP calculations.
(v) Figure assigned to energy used by heat pump to boost temperature.  
The emissions factors are " $\mathrm{CO}_{2}$ equivalent" values, which include $\mathrm{CH}_{4}$ and $\mathrm{N}_{2} \mathrm{O}$ in addition to $\mathrm{CO}_{2}$.
The emission factors and primary energy factors for electricity in Table 12 are a 5-year projection for 2020-2025.
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Appendix T defines the circumstances under which recommendations for improvements are made on EPC. RdSAP software tests for the relevance of improvement measures, and applies them where relevant, in the order shown in this table.  
Several heating measures apply when mains gas is not available (J,K,R,I). When mains gas is available, they are substituted by a fuel switch recommendation (item T). A recommendation is made only if it increases the SAP rating by at least 1 (one) SAP point, or 0.5 SAP point in the case of C (cylinder insulation), D (draughtproofing) and E (LEL). Several measures are marked as "Alternative measures"; these may not be shown on EPCs subject to the EPC design adopted by the EPC Register. In the case of new dwellings only items E, N, U and V2 are considered (this applies to all countries for new dwellings).  
Table 33 : Improvement measures
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Table 33 : Improvement measures  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  A | Loft insulation at ceiling level
Note. This is assumed to include insulation of the loft hatch. | Pitched roof (slates or tiles), accessible loft, insulation at ceiling level, not thatched roof.
Note: This does not include insulation of a room-in-roof | Loft insulation $\leq 150 \mathrm{~mm}$ or
U-value from Table 16 or Table 18 or entered by assessor $\geq 0.35 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 270 mm insulation or U-value $0.16 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$.
See Note 2.
For park home insulated loft 220 mm insulation or U-value $0.20 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 5  |
|  A2 | Flat roof insulation | Flat roof, known insulation or
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
See Note 2.
For park home insulated loft 220 mm insulation or U-value $0.20 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 5  |
|  A2 | Flat roof insulation | Flat roof, known insulation or
Pitched roof with sloping ceiling, known insulation | Flat roof insulation $<125 \mathrm{~mm}$ or U-value from Table 16 or Table 18 or entered by assessor $>0.35 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 270 mm insulation or U-value $0.16 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$. NI: $0.18 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$.
For park home insulated flat roof U-value 0.20 $\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}$ | 45  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
For park home insulated flat roof U-value 0.20 $\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}$ | 45  |
|  A3 | Roof room insulation | Roof rooms, not thatched roof, as built age band $<=\mathrm{H}$ or insulated with $\mathrm{U}>0.35 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | Any part of roof rooms with U-value from Table 16 or Table 17 or entered by assessor $>0.35 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 270 mm insulation or U-value $0.16 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$. NI: $0.18 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$.
See Note 13. | 46  |
|  B | Cavity wall insulation on its own | Unfilled cavity wall (assessed as "as built" and not "unknown");
Wall is suitable for cavity insulation; See Note 3 | Wall U-value entered by assessor or assumed from RdSAP tables $>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$. | England, Wales, Scotland, NI, IoM:
Cavity filled wall. Improved U-value $=0.55 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 6  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Cavity filled wall. Improved U-value $=0.55 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 6  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  Q | Solid wall insulation (internal) | Solid wall or park home wall, assessed as "as built" and not "unknown" | (Q-1) Wall U-value (as entered by assessor or assumed from RdSAP tables) $>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | Internal wall insulation with: U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
For a park home insulated wall has U-value 0.30 $\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}$
See Note 7 | 7  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
For a park home insulated wall has U-value 0.30 $\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}$
See Note 7 | 7  |
|   | Solid wall insulation (external) | Solid wall or park home wall, assessed as "as built" and not "unknown" | (Q-2) Wall U-value (as entered by assessor or assumed from RdSAP tables) $>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | External wall insulation with: U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
For a park home insulated wall has U-value 0.30 $\mathrm{W} / \mathrm{m}^{2} \mathrm{~K}$
See Note 7 | 65  |
|  Q2 | External insulation with cavity wall insulation (Alternative measure). | Cavity walls and there is already a recommendation to insulate cavity (measure B)
Or
cavity already insulated | (Q2-1) Cavity fill recommendation B
Or
Cavity wall U-value $<0.55 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
(which means insulated cavity) | For the walls which are already recommended for cavity fill:
U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 55  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
(which means insulated cavity) | For the walls which are already recommended for cavity fill:
U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 55  |
|   | Internal insulation with cavity wall insulation (Alternative measure). | Cavity walls and there is already a recommendation to insulate cavity (measure B)
Or
cavity already insulated | (Q2-2) Cavity fill recommendation B
Or
Cavity wall U-value $<0.55 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
(which means insulated cavity) | For the walls which are already recommended for cavity fill:
U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 66  |
|  W1 | Floor insulation (suspended floor) | Below the building part there is:
- ground, or
- external air, or
- unheated space
and floor is suspended | no insulation, or $\mathrm{U}>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | Insulated floor with U-value:
$\mathrm{U}=0.25 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
and floor is suspended | no insulation, or $\mathrm{U}>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | Insulated floor with U-value:
$\mathrm{U}=0.25 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$
For a park home insulated floor has U-value $0.30 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 57  |
|  W2 | Floor insulation (solid ground floor) | Below the building part there is
- ground
and floor is solid | no insulation, or $\mathrm{U}>0.7 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | Insulated floor with U-value:
$\mathrm{U}=0.25 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 58  |
|  C | Hot water cylinder insulation | Cylinder present and accessible. | (C-1) No cylinder insulation | Minimum 80 mm jacket | 1  |
|   |  |  | (C-2) Factory-applied insulation <= 25 mm | Add 80 mm jacket. See Note 1a. | 3  |
|   |  |  | (C-3) Jacket < 80 mm | Add additional jacket. See Note 1b | 2  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|   |  |  | (C-2) Factory-applied insulation <= 25 mm | Add 80 mm jacket. See Note 1a. | 3  |
|   |  |  | (C-3) Jacket < 80 mm | Add additional jacket. See Note 1b | 2  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  D | Draught proofing of windows and external doors | Existing dwelling has single-glazed windows or external doors which are not draught-proofed | Less than 100\% draught proofing of windows and doors | 100\% draught proofing | 10  |
|  E | Low energy lights | New or existing dwelling | LEL < 100\% of fixed outlets | LEL in all fixed outlets with efficacy 75 lumens/Watt (LEL includes LED and CFL bulbs) | 35  |
|  F | Cylinder thermostat | Cylinder present and accessible | No cylinder thermostat
(Note: cylinder thermostat is assumed for electric immersion) | Cylinder thermostat | 4  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|  F | Cylinder thermostat | Cylinder present and accessible | No cylinder thermostat
(Note: cylinder thermostat is assumed for electric immersion) | Cylinder thermostat | 4  |
|  G | Heating controls for wet central heating system | Main heating by boiler with radiators | (G-1) No controls | Room thermostat*, programmer and TRVs
*See Note 17 | 11  |
|   |  |  | (G-2) Programmer only | do. | 12  |
|   |  |  | (G-3) Room thermostat only | do. | 15  |
|   |  |  | (G-4) Room thermostat and TRVs | do. | 66
(new)  |
|   |  |  | (G-5) Programmer, single room thermostat (no TRVs) | do. | 13  |
|   |  |  | (G-6) TRVs (no room thermostat or BEM), with or without programmer | do. | 14  |
|   |  |  | (G1-1) Programmer and at least two room thermostat | Time and temperature zone control | 16  |
|   |  | Main heating by boiler with underfloor heating | (G1-2) Less than time and temperature zone control | Time and temperature zone control | 16  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|   |  | Main heating by boiler with underfloor heating | (G1-2) Less than time and temperature zone control | Time and temperature zone control | 16  |
|   |  | Main heating by heat pump with radiators or underfloor heating | (G1-3) Less than time and temperature zone control | Time and temperature zone control | 16  |
|  G2 | Water heating controls | Water heating present | No separate water controls | Separate time and temperature control for water heating | 70  |
|  H | Heating controls for warm air system | Main heating by mains gas or LPG warm air, or by heat pump | (H-1) No control | Programmer/time switch and room thermostat or
Programmable room thermostat | 17  |
|   |  |  | (H-2) Programmer only | do. | 18  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  J | Biomass boiler | House or bungalow.
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
No  |
| --- | --- | --- | --- | --- | --- |
|  J | Biomass boiler | House or bungalow.
Independent solid fuel boiler (not biomass or dual fuel) | Mains gas not available and if SAP rating with measure J is better than SAP rating with measure Z1 or Z2 | Manual feed biomass boiler in heated space (wood logs) with radiators. See Note 8. | 22  |
|  J2 | Biomass boiler
(Alternative measure) | House or bungalow
Heating other than by solid fuel or community | Heating system recommendation already given | Efficient wood logs boiler.
See Note 8 | 54  |
|  K | Biomass room heater with boiler | House or bungalow
Solid fuel open fire with or without boiler (not biomass or dual fuel) | (K-1) Mains gas not available and if SAP rating with measure K-1 is better than SAP rating with measure Z1 or Z2 | Wood pellet stove with radiators, summer immersion heater. See Note 8. | 23  |
|   |  | House or bungalow
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|   |  | House or bungalow
Solid fuel room heater with or without boiler (not biomass or dual fuel) | (K-2) Mains gas not available and if SAP rating with measure K-2 is better than SAP rating with measure Z1 or Z2 | Wood pellet stove with radiators, summer immersion heater. See Note 8. | 39  |
|  Z1 | Air or ground source heat pump with radiators | House or bungalow (not flat or maisonette); for flats and maisonettes heat pump is not recommended.
Heating other than by:
- heat pump or
- community
- wet underfloor system | Dwelling is fairly insulated, e.g. measures A to Q2 are NOT triggered. and
compare SAP rating from implementing Z1 with the SAP rating from the heating system recommendation (this will be one of R,S,T or L2);
recommend Z1 as a measure when SAP rating assessed with Z1 is equal or better than with heating measures (i.e. one R,S,T or L2).
Otherwise recommend R,S,T or L2 | Air or ground source heat pump and radiators.
(Z1-1) Heating system recommendation ASHP
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Otherwise recommend R,S,T or L2 | Air or ground source heat pump and radiators.
(Z1-1) Heating system recommendation ASHP
(Z1-2) Heating system recommendation GSHP
See note 9 | $\begin{aligned} & 51 \ & 75 \end{aligned}$  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  Z2 | Air or ground source heat pump with underfloor heating | House or bungalow (not flat or maisonette); for flats and maisonettes heat pump is not recommended.
Heating other than by:
- heat pump or
- community
and wet underfloor system
and Z1 not applicable | Dwelling is fairly insulated, e.g. measures A to Q2 are NOT triggered and
compare SAP rating from implementing Z2 with the SAP rating from the heating system recommendation (this will be one of R,S,T or L2);
recommend Z2 as a measure when SAP rating assessed with Z2 is equal or better than with heating measures (i.e. one R,S,T or L2).
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
recommend Z2 as a measure when SAP rating assessed with Z2 is equal or better than with heating measures (i.e. one R,S,T or L2).
Otherwise recommend R,S,T or L2 | Air or ground source heat pump and radiators.
(Z2-1) Heating system recommendation ASHP
(Z2-2) Heating system recommendation GSHP
See note 9 | $\begin{aligned} & 52 \ & 76 \end{aligned}$  |
|  Z3 | Micro-CHP
(Alternative measure) | Heating other than by micro-CHP or community and mains gas available | Heating system recommendation already given | Heating by micro-CHP.
See Note 10 | 53  |
|  I | Upgrade boiler, same fuel | Main heating by mains gas boiler (including range cooker boiler) or CPSU
or main heating by LPG or oil boiler (including range cooker boiler) and mains gas not available
Note. Not applicable to liquid biofuels. | (I-1) Boiler, not condensing, hot water cylinder in dwelling | Condensing regular boiler, same fuel as original. See Note 4 | 20  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Note. Not applicable to liquid biofuels. | (I-1) Boiler, not condensing, hot water cylinder in dwelling | Condensing regular boiler, same fuel as original. See Note 4 | 20  |
|   |  |  | (I-2) Boiler, not condensing, no hot water cylinder in dwelling | Condensing combi boiler, same fuel as original. See Note 4 | 20  |
|   |  |  | (I-3) CPSU, not condensing | Condensing combi boiler.
See Note 5 | 36  |
|   |  |  | (I-4) Range cooker boiler, hot water cylinder in dwelling | Condensing regular boiler, same fuel as original. See Note 4 | 37  |
|   |  |  | (I-5) Range cooker boiler, no hot water cylinder in dwelling | Condensing combi boiler, same fuel as original. See Note 4 | 38  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  R | Condensing oil boiler | Main heating by oil warm air | (R-1) Mains gas not available, hot water cylinder in dwelling and
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
No  |
| --- | --- | --- | --- | --- | --- |
|  R | Condensing oil boiler | Main heating by oil warm air | (R-1) Mains gas not available, hot water cylinder in dwelling and
if SAP rating with measure R-1 is better than SAP rating with measure Z1 or Z2 | Condensing regular oil boiler, radiators.
See Note 4 | 28  |
|   |  |  | (R-2) Mains gas not available, no hot water cylinder in dwelling and
if SAP rating with measure R-2 is better than SAP rating with measure Z1 or Z2 | Condensing combi oil boiler, radiators. See Note 4 | 28  |
|   | Change heating to gas condensing boiler (no fuel switch) | Main heating by mains gas fires | (S-1)
Hot water cylinder in dwelling | Condensing regular mains gas boiler, radiators.
See Note 4 | 40  |
|   |  |  | (S-2)
No hot water cylinder in dwelling | Condensing combi mains gas boiler, radiators.
See Note 4 | 40  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
See Note 4 | 40  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  T | Change heating to gas condensing boiler (fuel switch) | Main heating by:
- solid mineral fuel boiler
- LPG boiler (non-condensing)
- oil boiler (non-condensing)
- LPG fires
- oil warm air
- solid mineral fuel room heaters
- oil room heaters
Also if no space heating system present | (T-1) Mains gas available, hot water cylinder in dwelling | Condensing regular mains gas boiler, radiators. See Note 4 | 29  |
|   |  |  | (T-2) Mains gas available, no hot water cylinder in dwelling | Condensing combi mains gas boiler, radiators. See Note 4 | 29  |
|   |  | Main heating by:
- electric storage heating
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|   |  |  | (T-2) Mains gas available, no hot water cylinder in dwelling | Condensing combi mains gas boiler, radiators. See Note 4 | 29  |
|   |  | Main heating by:
- electric storage heating
- electric off-peak underfloor heating | (T-3) Mains gas available, hot water cylinder in dwelling | Condensing regular mains gas boiler, radiators. Change electricity meter to single. See Note 4 | 27  |
|   |  |  | (T-4) Mains gas available, no hot water cylinder in dwelling | Condensing combi mains gas boiler, radiators. Change electricity meter to single. See Note 4 | 27  |
|   |  | Main heating by LPG CPSU | (T-5) Mains gas available | Mains gas condensing CPSU | 42  |
|  T2 | Flue gas heat recovery | New or replacement gas boiler recommended (I, S or T) | Replacement boiler provides DHW | Add FGHRS | 50  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  L2 | New or replacement storage heaters | Main heating by storage heaters, Old (large volume) or Slimline | (L2-1) Mains gas not available, and hot-water heating by cylinder with single immersion, or from solid-fuel secondary heater and if SAP rating with measure L2-1 is better than SAP rating with measure Z1 or Z2 | High heat retention storage heaters (409) and controls (2404), and dual immersion water heating, large cylinder with 50 mm factory-applied insulation.
See Note 14. | 59  |
|   |  |  | (L2-2) Mains gas not available, and any other hot water system and if SAP rating with measure L2-2 is better than SAP rating with measure Z1 or Z2 | High heat retention storage heaters (409) and controls (2404).
See Note 14. | 60  |
|   |  | Main heating by:
- electric room heaters
- electric ceiling heating
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
See Note 14. | 60  |
|   |  | Main heating by:
- electric room heaters
- electric ceiling heating
Also if no space heating system present | (L2-3) Mains gas not available, and hot-water heating by cylinder with single immersion or from solid-fuel secondary heater or no hot water system present and if SAP rating with measure L2-3 is better than SAP rating with measure Z1 or Z2 | High heat retention storage heaters (409) and controls (2404), 7-hour off-peak tariff and dual immersion water heating, large cylinder with 50 mm factoryapplied insulation.
See Note 14.
Secondary electric heaters (693) if no existing secondary. | 61  |
|   |  |  | (L2-4) Mains gas not available, and any other hot water system and if SAP rating with measure L2-4 is better than SAP rating with measure Z1 or Z2 | High heat retention storage heaters (409) and controls (2404), 7-hour off-peak tariff.
See Note 14.
Secondary electric heaters (693) if no existing secondary | 62  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
See Note 14.
Secondary electric heaters (693) if no existing secondary | 62  |
|  M | Replacement warm-air unit | Main heating by mains gas | (M-1) Non-condensing | New condensing warm-air unit, same fuel as original. See Note 15. | 26  |
|   |  | Main heating by LPG warm air | (M-2) Age before 1998 | New (non-condensing) warm-air unit, same fuel as original, on-off control, fan-assisted flue | 26  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  N | Solar water heating | RdSAP assessment, house or bungalow, not thatched roof on main dwelling | (N-1) No solar panel | Solar panel with parameters per
Table 29 : Heating and hot water parameters in RdSAP10 specification.
Increase a normal or unknown size cylinder to medium (see * below). | 19  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Table 29 : Heating and hot water parameters in RdSAP10 specification.
Increase a normal or unknown size cylinder to medium (see * below). | 19  |
|   |  | SAP assessment, house or bungalow | (N-2) No solar panel | Solar panel, $3 \mathrm{~m}^{2}$ aperture area, evacuated tube with $\eta=0.70, \mathrm{a}*{1}=1.80, \mathrm{a}*{2}=0.005$, facing South, pitch $30^{\circ}$, modest overshading. Combined DHW cylinder at least 190 litres (see * below), solar part 75 litres; or if combi boiler, CPSU or instantaneous water heater, a separate solar pre-heat cylinder of 75 litres. | 19  |
|   |  | All cases: |  | * Cylinder change not applicable to water heating by:
- combi boiler
- CPSU
- heat pump (including hot water only)
- micro-CHP with integral DHW vessel
- instantaneous water heater
- community heating.
In these cases add a separate solar cylinder of 75 litres
Cylinder has cylinder thermostat and 50 mm factoryapplied insulation. |   |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
- instantaneous water heater
- community heating.
In these cases add a separate solar cylinder of 75 litres
Cylinder has cylinder thermostat and 50 mm factoryapplied insulation. |   |
|  Y | Waste water heat recovery | Dwelling has a mixer shower and no WWHRS
Recommendation applicable only if hot water if from a cylinder or a combi boiler. | WWHRS not present | Add WWHRS for each shower.
See Note 16. | 49  |
|  O | Double glazed windows (replace single-glazed windows with doubleglazed) | Single glazed windows present | Less than $80 \%$ of windows with multiple glazing | All single glazed windows replaced by double glazing with $\mathrm{U}=1.4 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (vertical windows) or $\mathrm{U}=1.6$ (roof windows) and $\mathrm{g}=0.63$.
See Note 12. | 8  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
See Note 12. | 8  |  
|  Item | Measure | To be considered when existing dwelling is/has: | Recommended if existing dwelling has: | Improve to: | Rec
No  |
| --- | --- | --- | --- | --- | --- |
|  O3 | Glazing replacement | Double glazing with PVC frames and 12 mm gap installed before 2002 (E\&W) or 2003 (Scotland) or 2006 (Northern Ireland) | At least $80 \%$ of windows are of that type | Replace double glazing units with new glazing giving whole-window values of $\mathrm{U}=1.4$ and $\mathrm{g}=0.63$. | 56  |
|  P | Secondary glazing | Single glazing present but assessor de-selected measure O. See Note 6 | Less than $80 \%$ of windows with multiple glazing | apply secondary glazing to single glazed windows with
$\mathrm{U}=2.9 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (vertical windows) or
$\mathrm{U}=3.2 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (roof windows)
and $\mathrm{g}=0.76$.
Otherwise, windows with single glazing changed to double glazing with
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
$\mathrm{U}=3.2 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (roof windows)
and $\mathrm{g}=0.76$.
Otherwise, windows with single glazing changed to double glazing with
$\mathrm{U}=1.4 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (vertical windows) or
$\mathrm{U}=1.6 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ (roof windows)
and $\mathrm{g}=0.63$.
See Note 12. | 9  |
|  X | Insulated doors | House, bungalow, or park home, or (Flat or maisonette) and (no corridor or more than one door) i.e. door directly to outside | Door(s) directly to outside not insulated | Change doors directly to outside to insulated doors with $\mathrm{U}=1.4 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}$ | 48  |
|  U | Photovoltaics | House or bungalow, not thatched roof | No photovoltaics | Photovoltaics, 2.5 kWp , facing South, pitch $30^{\circ}$, modest overshading, connected to dwelling's electricity meter. Add Addenda item 15, see Table 30 : Addendum | 34  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|  V2 | Wind turbine | House or bungalow in rural location | No wind turbine | Wind turbine on mast, blade diameter 4.0 m , hub height 10 m above ridge | 44  |
|  Y2 | PV diverter | Dwelling has PV
No PV battery storage present
No solar water heating present | Hot water tank present | Add PV diverter | 73  |
|  Y1 | PV battery | Dwelling has PV | PV but no battery storage | One battery 5 kWh | 72  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
No solar water heating present | Hot water tank present | Add PV diverter | 73  |
|  Y1 | PV battery | Dwelling has PV | PV but no battery storage | One battery 5 kWh | 72  |  
Note 1 : Improvement A. Loft insulation is considered separately for main roof and extensions 1, 2, 3, 4 as applicable and applied to all accessible roofs with insulation $<=150 \mathrm{~mm}$. Note 1a : Improvement C. Cylinder insulation, existing is factory applied $<=25 \mathrm{~mm}$ : SAP Table 2 is constructed on the basis that 80 mm jacket is equivalent to 25 mm factory-applied insulation. Therefore an additional 80 mm jacket can be implemented by increasing the existing insulation thickness by an additional 25 mm , to the nearest RdSAP thickness option for cylinders. Thus 12 mm improves to 38 mm , and 25 mm improves to 50 mm .
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Note 1b : Improvement C. Cylinder insulation, existing is jacket $<80 \mathrm{~mm}$ : 12 or 25 mm improves to 80 mm , and 38 or 50 mm improves to 120 mm . Note 3 : Cavity wall insulation. Cavity wall insulation is considered separately for main wall, extensions 1, 2, 3, 4 and alternative walls as applicable and applied to all fillable walls. When cavity fill is recommended the data collection includes whether there might be issues of cavity less than 50 mm , high exposure or difficulties of access. If any of those apply an addendum is included on the EPC saying that the issues should be investigated to establish the best treatment for the walls, e.g. dwelling should be assessed for exposure to driving rain.
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
Note 3a: Insulation of party walls can be considered for semi-detached or terraced houses or bungalows. When party wall insulation is recommended, an Addendum on the EPC shall advise on the need for any statutory approvals (planning approval, Listed Building Consent, Party Wall Notices or approval under the Building Regulations) for the proposed improvement work.  
Note 4 : Improvements I, R, S, T. Use database boiler as follows:  
|  Replacement boiler fuel and type | Boiler database index | Replacement boiler fuel and type | Description  |
| --- | --- | --- | --- |
|  mains gas regular | 690001 | mains gas regular | Regular, condensing $88.9 \%$  |
|  mains gas combi (not storage combi) | 690002 | mains gas combi | Instant combi, condensing $88.9 \%$  |
|  mains gas storage combi | 690003 | mains gas storage combi | Storage combi, condensing $89.4 \%$  |
|  LPG regular | 690004 | LPG regular | Regular, condensing $91.1 \%$  |
21 IMPROVEMENT MEASURES FOR ENERGY PERFORMANCE CERTIFICATES (FORMER APPENDIX T)
|  mains gas storage combi | 690003 | mains gas storage combi | Storage combi, condensing $89.4 \%$  |
|  LPG regular | 690004 | LPG regular | Regular, condensing $91.1 \%$  |
|  LPG combi | 690005 | LPG combi | Instant combi, condensing $90 \%$  |
|  oil regular | 690006 | oil regular | Regular, condensing $92 \%$  |
|  oil combi | 690007 | oil combi | Instant combi, condensing $90.1 \%$  |  
The table below is shown here for information and will be deleted at the final stage. Controls are:  
- for radiator systems:
- programmer,
- room thermostat and TRVs (or time and temperature zone control if already present),
- if interlocked, separate timing of space and water heating (if regular boiler);
- if a gas-fired combi boiler is installed at least one of the following should be installed: (these are options a to d from ADL-2021 paragraph 6.2) a. FGHR b. Weather compensation c. Load compensation d. Smart thermostat with automatization and optimisation
for underfloor systems:
- time and temperature zone control.  
Also:  
- emitter temperature unknown;
- cylinder insulation and stat: 50 mm factory-applied insulation and cylinder thermostat.
- cylinder size:
- for measure I, leave cylinder size as it is;
- in the case of measures R, S and T, if regular boiler, cylinder of at least normal size (no solar panel) or medium size (solar panel present).  
When there are two boilers, if main system 1 is being upgraded to a new boiler the new boiler does the water heating, unless main system 2 is also being upgraded to a new boiler (improvement I for both boilers) and the water heating was from main system 2 - in that case water heating stays with main system 2.  
In the case of improvement I, if only system 2 is being upgraded leave water heating source, cylinder (size, insulation, stat) and secondary heating system unchanged.  
- if a gas-fired range cooker: a replacement includes two independently controlled burners (one for cooking and one for the boiler)
for underfloor systems:
- if a gas-fired range cooker: a replacement includes two independently controlled burners (one for cooking and one for the boiler)
- If gas-fired warm air system: time and temperature control .  
Note 5 : Replacement CPSU. Replacement is database condensing combi boiler 690003 (mains gas) or 690005 (LPG). Controls are programmer, room thermostat and TRVs, interlocked system. (690003 is a primary storage combi boiler. At present there are no condensing CPSUs available.) Note 6 : Secondary glazing. If any of the windows are single glazed, a recommendation should be made for double glazing of all single-glazed windows. If the assessor cancels this recommendation, a recommendation is made for secondary glazing for the single-glazed windows. The secondary glazing option should appear only in these circumstances.
for underfloor systems:
Note 7 : Improvement Q. Solid wall insulation is considered for main wall, extensions 1, 2, 3 and 4 and alternative wall as applicable and applied to all applicable walls. Implemented by changing the wall insulation to external wall insulation but leaving the building dimensions (in the reduced data set) unchanged.  
Note 8 : Improvements J, J2, K. Database boiler 691001 (wood logs) or 691002 (wood pellets). Heating controls are programmer, room thermostat and TRVs. Upgrade hot water cylinder to medium size with 50 mm factory-applied insulation and cylinderstat, separate timing of water heating.  
This table is for information and will be deleted at the final stage.  
|  Replacement boiler fuel and type | Boiler database index | Description  |
| --- | --- | --- |
|  Wood logs | 691001 | Independent boiler $82 \%$ efficient  |
|  Wood pellets | 691002 | Closed room heater $82 \%$ efficient  |
|  Wood pellets | 691003 | Independent boiler $83 \%$ efficient  |
for underfloor systems:
|  Wood logs | 691001 | Independent boiler $82 \%$ efficient  |
|  Wood pellets | 691002 | Closed room heater $82 \%$ efficient  |
|  Wood pellets | 691003 | Independent boiler $83 \%$ efficient  |  
Note 9 : Improvements Z1, Z2. Use database heat pump as follows using the design heat loss of the dwelling allowing for any insulation measures already included: Ground source HP:  
|  Emitter | Design heat loss
$\mathbf{k W}$ | Illustrative HP
$\mathbf{k W}$ | Boiler database
index | efficiency  |
| --- | --- | --- | --- | --- |
|  Radiators | $<5 \mathrm{~kW}$ | 4.6 | 693001 | 374.5  |
|  Radiators | $5-8 \mathrm{~kW}$ | 7.6 | 693002 | 374.5  |  
|  Radiators | $>8 \mathrm{~kW}$ | 9.8 | 693003 | 374.5  |
| --- | --- | --- | --- | --- |
|  Fan coils | $<5 \mathrm{~kW}$ | 4.9 | 693007 | 411  |
|  Fan coils | $5-8 \mathrm{~kW}$ | 8.0 | 693008 | 411  |
|  Fan coils | $>8 \mathrm{~kW}$ | 10.4 | 693009 | 411  |
|  Underfloor | $<6 \mathrm{~kW}$ | 5.3 | 693004 | 414  |
for underfloor systems:
|  Fan coils | $5-8 \mathrm{~kW}$ | 8.0 | 693008 | 411  |
|  Fan coils | $>8 \mathrm{~kW}$ | 10.4 | 693009 | 411  |
|  Underfloor | $<6 \mathrm{~kW}$ | 5.3 | 693004 | 414  |
|  Underfloor | $6-10 \mathrm{~kW}$ | 8.5 | 693005 | 414  |
|  Underfloor | $>10 \mathrm{~kW}$ | 10.9 | 693006 | 414  |  
Air source HP:  
|  Emitter | Design heat loss
$\mathbf{k W}$ | Illustrative HP
$\mathbf{k W}$ | Boiler database
index | efficiency  |
| --- | --- | --- | --- | --- |
|  Radiators | $<3 \mathrm{~kW}$ | 2 | 693010 | 328.2  |
|  Radiators | $3-8 \mathrm{~kW}$ | 5.4 | 693011 | 328.2  |
|  Radiators | $>8 \mathrm{~kW}$ | 14 | 693012 | 328.2  |
|  Fan coils | $<3 \mathrm{~kW}$ | 2.8 | 693013 | 359.1  |
|  Fan coils | $3-8 \mathrm{~kW}$ | 5.7 | 693014 | 359.1  |
|  Fan coils | $>8 \mathrm{~kW}$ | 14 | 693015 | 359.1  |
|  Underfloor | $<4 \mathrm{~kW}$ | 3 | 693016 | 359.7  |
|  Underfloor | $4-8 \mathrm{~kW}$ | 6.1 | 693017 | 359.7  |
|  Underfloor | $>8 \mathrm{~kW}$ | 14 | 693018 | 359.7  |
for underfloor systems:
|  Underfloor | $<4 \mathrm{~kW}$ | 3 | 693016 | 359.7  |
|  Underfloor | $4-8 \mathrm{~kW}$ | 6.1 | 693017 | 359.7  |
|  Underfloor | $>8 \mathrm{~kW}$ | 14 | 693018 | 359.7  |  
Software selects HP on a basis of Design Heat Loss (DHL), calculated as dwelling's heat loss coefficient multiplied by a temperature difference of 24.2 K ; refer to SAP10.2 Specification Appendix N for further details on DHL.  
Note: Z1-1 (ASHP ) and Z1-2 (GSHP) have different installation costs. Note 10 : Improvement Z3. Database micro-CHP 692001 (mains gas). If the PSR is out of range cancel the recommendation. Heating controls are programmer and room thermostat. If DHW is not from main system, change it to main system. If no existing DHW cylinder add one of normal size ( 110 litres) with 50 mm factory insulation; Upgrade an existing hot water cylinder to at least normal size (no solar panel) or medium size (solar panel present) with 50 mm factory-applied insulation and cylinderstat.
for underfloor systems:
Note 11: Alternative measures (Q2, J2, Z1, Z2, Z3). These are to be included in the XML (except for park homes) so that they can be mentioned on the EPC, subject to the selection conditions shown in the table for the measure and their attaining a cost saving (using current prices) of at least $£ 10$.  
In the case of the heating alternatives (J2, Z1, Z2, Z3):  
- implement each applicable alternative recommendation (in the case of heat pumps as an air source heat pump)
- if total costs are reduced by at least $£ 10$ mark it as a possible alternative recommendation
- remove amended heating system and proceed to next one  
- finally check the effect of the heating upgrade for the main recommendation list, retain alternatives that meet the above criterion if the main heating upgrade is recommended; if not discard the alternatives as well
for underfloor systems:
Note 12 : Improvements O, P. If there is already some single glazing, the double glazing or secondary glazing improvement is implemented by changing single glazed windows changed to above specification and other windows left as they are. If Assessor cancels double/glazing recommendation, the recommendation becomes "secondary glazing".  
Note 13: Improvements for roof rooms. Any roof room element with a U-value 'known' to be $>0.35$ should be improved to 0.16 . 'Known' means i) U-value entered by the assessor, ii) U-value deduced from the insulation thickness entered by the assessor, or iii) an as built U-value taken from RdSAP Tables. Any roof room element with an 'unknown' U-value should not be improved. 'Unknown' means i) the presence of insulation is unknown, or ii) an element is known to have insulation, but the insulation thickness is unknown.  
Therefore, based on the insulation status the following logic applies:
for underfloor systems:
Therefore, based on the insulation status the following logic applies:
a. Roof room insulation type or insulation thickness $=$ unknown: No improvement recommendation.
b. Roof room insulation $=$ as built: Change all elements of roof rooms with U-value $>0.35$ (from RdSAP Tables) to $\mathrm{U}=0.16$
e. Roof room details (area and U-values) provided: Recommend improvement if any elements with U-value $>0.35$ to $\mathrm{U}=0.16$  
Note 14 : Improvement L2. New storage heater is 697101.
Note 15 : Improvement M. Warm air system is 697001 (space only) or 697002 (space and water). If the existing cylinder is indicated as "no access" in the RdSAP data its size is reassessed according to Table 28 : Cylinder size. If the heating system being replaced was not providing water heating, the water heating arrangements remain as they are.