BLT reference number: 135/06 BLT approval number: 035/06

(replaces BLT reference number: 215/01) (replaces BLT approval number: 011/02)

Pellet burner

EVOTHERM HP 14

Applicant and manufacturer:

EVOTHERM

Heiztechnik Vertriebs GmbH

Seeleiten 24

AT 5120 St. Pantaleon

A 3250 Wieselburg, Rottenhauser Straße 1

Tel.: +43 7416 52175 -0, Fax: +43 7416 52175 – 45

blt@josephinum.at, http://blt.josephinum.at

TEST REPORT
REVISED EDITION

The present test report for pellet burner EVOTHERM HP 14, approval no. 035/06, is a revised edition of the 

test report for pellet burner HMS HP 14, approval no. 011/02. 

The pellet burner EVOTHERM HP 14 has been manufactured by Evotherm Heiztechnik Vertriebs GmbH. 

The revised test report has been reissued due to the modified manufacturer and type designation.

The construction of this burner is identical to that of the type-tested pellet burner HMS HP 14, approval no. 

011/02.

For the

factual correctness:

ADir. Dipl.-HLFL-Ing.

Leopold Lasselsberger e. h.

For the 

report and tests:

Ing.

Harald Baumgartner e. h.

Head of the 

accredited test centre:

Hofrat Dipl.-Ing. Dr.

Johann Schrottmaier e. h.

Wieselburg, 21/06/2006

Translation: 31/07/2009

Pellet burner EVOTHERM HP 14

BLT reference number: 135/06
The BLT Wieselburg is an accredited burner test centre issued with identification number 112 according 

accreditation law BGBl. No. 468/1992. The quality management system complies with the requirements 

defined in ÖVE/ÖNORM EN ISOIEC 17 025.

Rottenhauser Straße 1

A 3250 Wieselburg

Austria / Österreich

Tel.: +43-7416-52175-0

Fax: +43-7416-52175-45

E-Mail: blt@josephinum.at

Internet: http://blt.josephinum.at

The test results detailed in this test report exclusively refer to the test piece specified in the chapter 

„Boiler plate information“.

The test report must be published only literally and unabridged.

Exceptions have to be authorized by Francisco Josephinum BLT.

Authorized translation

In the event of doubt the German original shall prevail.
TEST REPORT

BLT reference number: 215/01 BLT approval number: 011/02

Pellet burner HMS HP 14

Applicant:

HMS Heiztechnik Maschinenbau Service

Hofer & Manglberger OEG

Seeleiten 24

5120 St. Pantaleon

Manufacturer:

Same as applicant
Bundesanstalt für Landtechnik

Federal Institute of Agricultural Engineering

Postfach 43

Rottenhauser Straße 1

A 3250 Wieselburg

Austria / Österreich

Tel.: +43-7416-52175-0

Fax: +43-7416-52175-45

E-Mail: direktion@blt.bmlf.gv.at

Internet: http://www.blt.bmlf.gv.at

The test report must be published only literally and unabridged

apart from exceptional cases confirmed in writing.
- 1 - (215/01)

DESCRIPTION

The tested pellet burner HMS HP 14 manufactured by the company HMS Heiztechnik 

Maschinenbau Service Hofer & Manglberger OEG with a nominal heat output of 14,0 kW 

comprises a pellet container, the fuel feeding system with an integrated rotary gate valve, the 

burner and the combustion chamber and a two-pass vertically set up pipe heat exchanger. 

The burner is equipped with an electric ignition fan, a cleaning motor for the heat exchanger 

and the burner, a speed-controlled draught fan, a Lambda sensor and a microprocessor 

control system.

A cuboid sheet metal storage container was used to perform the tests. At the bottom of the 

extraction container a flexible extraction screw is situated which is arranged in a ductile PLT 

pipe. This screw conveyor is connected with a chain with a rotary gate valve situated on the 

back of the boiler and therefore makes up a driving motor which is powered by a DC motor. 

The discharge system and the stoker screw are coupled with a slewable ball clutch system. 

The stoker screw transports the wood pellets diagonally upwards from where they fall 

through a drop shaft into the heat resistant metal burner. The fuel is ignited with a hot air 

blower. The ignition procedure and the combustion are monitored by a photo cell. The 

ignition is regulated by a microprocessor system which adjusts the fuel feed with a speedcontrolled draught fan, a Lambda sensor, a photo cell as well as the boiler sensors and flue 

gas temperature sensors according to the required heat output level. The levels of the 

primary air and secondary air flows are preset with factory-made valves. The primary air flow 

is directed through the fuel bed and the combustion gases are supplied with the secondary 

air flow with baffle plates. The combustion gases flow then to the pipe heat exchanger with 

integrated turbulators. The heat exchanger and the burner are automatically cleaned by a 

cleaning motor. The system is automatically cleaned by a two-part tipping grate. The ashes 

from the heat exchanger and the combustion chamber are collected in a common ash box. 

The combustion chamber and the heat exchanger are thermally insulated from the outside.

BOILER PLATE INFORMATION

HMS Heiztechnik Maschinenbau Service

Hofer – Manglberger OEG

Seeleiten 24

A-5120 St. Pantaleon

Heizkessel-Type: HMS HP 14

Brennstoff: Holzpellets

Wasserinhalt: 24 l

Wärmeleistung: 14 kW

Baujahr: 2001

Seriennummer: 10005

Leistungsbereich: 4-14 kW

max. Betriebsdruck: 3 bar

max. Betriebstemperatur: 85 °C

elektr. Anschluss: 230V AC 50 Hz 8 A

Leistungsaufnahme: max. 1,6 kW
- 2 - (215/01)

DIAGRAM OF THE BURNER

TECHNICAL DATA

Burner

Overall width ...............................................................................................................553 mm

Overall depth...............................................................................................................760 mm

Overall depth with stoker unit ....................................................................................1160 mm

Overall height ............................................................................................................1035 mm

Overall weight burner incl. stoker driving unit (without water) ...................................... 200 kg

Water capacity...............................................................................................................29 l

Diameter of flue gas pipe............................................................................................ 130 mm

Height to centre of flue gas pipe ..................................................................................735 mm

Flow / return connection ..................................................................................................1 "

Thermal insulation ..................................................................................................50-150 mm

Thickness of sheets exposed to fire.................................................................................5 mm

Draught fan

Ash box

Heat exchanger

with 

swirls

User display

Inspection glass

Downpipe

inlet

Burner

Control box

Control panel
- 3 - (215/01)

MEASUREMENTS AT THE TEST RIG

Measurements were taken to determine the heat output, boiler efficiency (direct method), flue 

gas composition, flue gas temperature in the measuring section, feed pressure (draught), 

emission characteristics and electrical power consumption. The surface temperatures were 

measured at nominal heat output and at stationary operation; this allowed the surface losses 

to be estimated.

The measurement equipment and the measurement methods correspond to ÖNORM EN 

303-5 and EN 304.

TEST SETUP, MEASUREMENT METHODS

BOILER TEST RIG WITH HEAT EXCHANGER: Heat output measurement by directly 

measuring the amount of water circulated through the heating circuit and its temperature 

increase (DIN 4702-2).

FLUE GAS EXTRACTION through a vertical measuring section, generating the feed 

pressure using a prefabricated flue pipe, diameter 200 mm, height above ground level 9 m, 

feed pressure limited by draught restriction flap.

HEAT OUTPUT MEASUREMENT: Determining the mass flow using the Coriolis mass flow 

meter PROMASS 63 F from Endress & Hauser, as well as the water temperatures at the 

boiler flow/return using a Pt 100 resistance thermometer, 1/3 DIN, calibrated as a pair.

FLUE GAS TEMPERATURE in the measuring section using a measurement system with 5 

Pt 100 resistance thermometers.

FEED PRESSURE with a ring balance meter.

WATER-SIDE RESISTANCE: Differential pressure transducer with ceramic measuring 

membranes DELTABARS PMD 230 from Endress & Hauser.

CARBON DIOXIDE AND CARBON MONOXIDE CONTENT: Non-dispersive infrared gas 

analyser NGA 2000 from Fisher-Rosemount; carbon dioxide: lowest measurement range 0 -

5 %, highest measurement range 0 - 20 %; carbon monoxide: lowest measurement range 0 -

400 ppm, highest measurement range 0 - 20000 ppm; measured in dry flue gas.

DUST CONTENT: Dust meter by company Ströhlein with nominal suction quantity of 4 m3/h, 

dust separation on stuffed quartz wool filter; filter is located directly after sampling probe and 

elbow, determination of partial flow volume by dry gas meter and upstream drying tower. The 

sampling point for determination of dust content is arranged directly after the measuring 

section.

CONTENT OF ORGANIC GASEOUS SUBSTANCES: Flame ionisation detector from JUM, 

Type VE 5; samples taken via heated filter and heated pipe (thermostatically controlled to 

180 °C); measured in damp flue gas.

NITROGEN MONOXIDE CONTENT: Gas analyser from ECO Physics Type CLD 700 E1-ht; 

chemiluminescent measurement principle; samples taken via heated filter and heated pipe; 

gas cooler; measured in damp flue gas.
- 4 - (215/01)

DATA LOGGING using data logging system from Schlumberger Scorpio SI 3535D, sampling 

interval 10 seconds, average value determined from 6 measurements, average data stored 

to media.

PERFORMANCE OF HEATING TESTS

HEAT OUTPUT: The measurements were carried out in accordance with ÖNORM EN 303-5 

at nominal and minimum heat output (< 30 % of the nominal heat output) respectively. The 

nominal heat output measurements were performed after the burner had been in operation 

for at least 3 hours in the nominal heat output range. The measurements themselves were 

taken over a test period of at least 6 hours. 

EMISSIONS: Carbon dioxide, carbon monoxide, organic carbon and nitrogen oxide values 

were averaged over the whole test duration. For determining the dust content the extraction 

time per filter was limited to 30 minutes. The dust content was determined by 6 half-hourly 

averages, evenly distributed over the test duration. Calibration gases were used to check the 

gas analysers before and after every test period. 

The measurements were carried out in accordance with ÖNORM EN 303-5. The emissions 

of dust and nitrogen oxides were determined only at nominal heat output.

SETTINGS: The declared measurements relate to reproducible tests using optimised 

settings. The settings were made during preliminary tests based on recommendations of the 

manufacturer. It was aspired to maximise the carbon dioxide content whilst at the same time 

minimising the carbon monoxide content. 

FUEL: The measurements were performed with wood pellets with a diameter of 6 mm and a 

water content of 10,5 % and 10,6 % according to ÖNORM M 7135. The calorific value and 

the water content were determined; the average values of the chemical data relating to the 

water- and ash-free substances were taken from ÖNORM M 7132.

FUNCTION CHECK of the temperature controller, safety temperature limiter and monitor. 

The measurements at the boiler were performed as specified in 5.13 of ÖNORM EN 303-5. 

The functional check to verify the rapid shutdown of the burner system was performed as 

specified in 3.35 and 4.1.5.11.2 according to ÖNORM EN 303-5:1999.

INTERPRETATION OF EMISSION MEASUREMENTS

The emission measurements were analysed by calculating the complete flue gas analysis 

using the carbon monoxide and the carbon dioxide content averaged over the measurement 

period together with the fuel composition data. The speed of the flue gas at the measuring 

point was calculated from the flue gas volume taking into account the pressure and 

temperature. 

The content of organic gaseous substances was measured in damp flue gas, the emissions 

were then converted for dry flue gas conditions and declared as organic carbon and NO2. 
- 5 - (215/01)

Test identification Nominal heat output 

 Number of test: hka604

 Name of boiler: Pellet burner HMS HP 14 

 Nominal heat output: 14 kW

 Minimum Average Maximum

 value value value

Test conditions

 Start of test: 2001-08-22 06:53

 End of test: 2001-08-22 12:54

 Test duration: 06:01

 Ambient temperature: °C 21,5 22,0 22,9

 Outside temperature: °C 17,5 18,4 21,0

 Air pressure: mbar 996

Test fuel, heat input

 Test fuel Wood pellets 01_203 

 Water content kg/kg 0,105

 Ash content kg/kg 0,003

 Carbon content kg/kg 0,453

 Hydrogen content kg/kg 0,055

 Oxygen content kg/kg 0,383

 Calorific value of anhydrous

 and ash-free substance MJ/kg 19,0

 Calorific value of test fuel MJ/kg 16,6

 Applied fuel quantity kg 19,1

 Hourly fuel quantity kg/h 3,2

 Fuel heat input kW 14,7

Heat output, efficiency

 Water circulation kg/h 533,6 552,2 559,8

 Flow temperature °C 49,8 54,6 56,5

 Return temperature °C 70,4 76,2 80,1

 Temperature difference K 18,1 21,6 26,2

 Heat output kW 14,0

 Utilisation % 100,0

 Boiler efficiency % 94,9

Measured values at flue gas measuring section

 Flue gas temperature °C 85,2 96,5 100,4

 Manometric pressure Pa 1,5 2,0 4,2

 Carbon dioxide % 10,6 13,7 17,7

 Carbon monoxide ppm 5,3 59,6 3943,2

 Organic gaseous substances ppm 0,3 0,9 51,0

 Nitrogen monoxide ppm 73,0 94,0 106,8
- 6 - (215/01)

EMISSION MEASUREMENTS

Measurement results test: hka604

(Calculation depending on CO2-measurement)

Suction start: hh:mm 07:05 08:05 09:05 10:05 11:05 12:05

Suction period: min 30 30 30 30 30 30

CO2-content (measured): % 14,8 13,4 13,2 12,9 13,7 13,8

O2-content (calculated): % 5,6 7,1 7,3 7,5 6,8 6,6

Density of gas sample:

Dry gas: kg/Nm3 1,37 1,36 1,36 1,36 1,36 1,36

Humid gas: kg/Nm3 1,30 1,30 1,30 1,30 1,30 1,30

Water content: g/Nm3 92,6 84,9 83,7 82,4 86,6 87,3

Velocity:

At sampling point: m/s 0,59 0,65 0,66 0,67 0,64 0,63

At probe head: m/s 0,69 0,71 0,71 0,72 0,72 0,71

Dust separated mg 7,4 5,0 8,6 3,9 5,2 8,8

Dust separated relating 

to sample volume mg/Nm3 12,9 8,5 14,6 6,5 8,8 15,1

EVALUATION

 relating to relating to

 O2-content of 13 % applied energy

 mg/Nm3 mg/MJ

 Dust 6 4

 Carbon monoxide (CO) 42 28

 Organic gaseous

 substances (OGC) 1 <1

 Nitrogen oxides (NOx) 122 81
- 7 - (215/01)

OUTPUT-RELATED MEASUREMENTS

0 60 120 180 240 300 360

Time [min]

0

4

8

12

16

20

24

[kW]

Heat output

hka604

0 60 120 180 240 300 360

Time [min]

0

50

100

150

200

250

300

[°C]

Flue gas temp.

Flow temp.

Return temp.

hka604
- 8 - (215/01)

FLUE GAS COMPOSITION

0 60 120 180 240 300 360

Time [min]

0

4

8

12

16

20

24

CO2 [%]

0

1000

2000

3000

4000

5000

6000

CO [ppm]

Carbon dioxide

Carbon monoxide

hka604

0 60 120 180 240 300 360

Time [min]

Dust

0

25

50

75

100

125

150

Dust [mg/Nm3]

Organic C

0

25

50

75

100

125

150

OGC, NOx [ppm]

Nitrogen oxide

hka604
- 9 - (215/01)

Test identification Minimal heat output 

 Number of test: hka606

 Name of boiler: Pellet burner HMS HP 14 

 Nominal heat output: 14 kW

 Minimum Average Maximum

 value value value

Test conditions

 Start of test: 2001-08-22 22:46

 End of test: 2001-08-23 07:35

 Test duration: 08:49

 Ambient temperature: °C 25,2 26,1 26,2

 Outside temperature: °C 18,0 18,5 19,4

 Air pressure: mbar 997

Test fuel, heat input

 Test fuel Wood pellets 01_203 

 Water content kg/kg 0,106

 Ash content kg/kg 0,003

 Carbon content kg/kg 0,453

 Hydrogen content kg/kg 0,055

 Oxygen content kg/kg 0,383

 Calorific value of anhydrous

 and ash-free substance MJ/kg 19,0

 Calorific value of test fuel MJ/kg 16,6

 Applied fuel quantity kg 8,4

 Hourly fuel quantity kg/h 1,0

 Fuel heat input kW 4,4

Heat output, efficiency

 Water circulation kg/h 123,6 133,7 151,2

 Flow temperature °C 50,4 51,9 53,6

 Return temperature °C 71,1 78,2 82,9

 Temperature difference K 19,4 26,3 31,2

 Heat output in the

 boiler circuit kW 4,1

 Utilisation % 29,3

 Boiler efficiency % 92,9

Measured values at flue gas measuring section

 Flue gas temperature °C 67,4 68,7 70,1

 Manometric pressure Pa 1,5 1,5 1,6

 Carbon dioxide % 3,7 9,3 13,4

 Carbon monoxide ppm 24,3 109,7 1821,7

 Organic gaseous substances ppm 0,3 1,7 78,2
- 10 - (215/01)

OUTPUT-RELATED MEASUREMENTS

0 90 180 270 360 450 540

Time [min]

0

1

2

3

4

5

6

[kW]

Heat output

hka606

0 90 180 270 360 450 540

Time [min]

0

50

100

150

200

250

300

[°C]

Flue gas temp.

Flow temp.

Return temp.

hka606
- 11 - (215/01)

FLUE GAS COMPOSITION

0 90 180 270 360 450 540

Time [min]

0

4

8

12

16

20

24

CO2 [%]

0

400

800

1200

1600

2000

2400

CO [ppm]

Carbon dioxide

Carbon monoxide

hka606

0 90 180 270 360 450 540

Time [min]

Organic C

0

25

50

75

100

125

150

OGC, NOx [ppm]

hka606
- 12 - (215/01)

SURFACE LOSSES

The heat loss through the boiler surface is determined using DIN 4702-2:1990 basing on 

radiation coefficients and arrangements of technical surfaces (according to Nusselt). During a 

test temperatures were measured at 40 points on the boiler surface at the nominal heat output 

and the heat loss through the surface was determined using DIN 4702-2. The measurement 

results are shown in the following table:

Test number: HKA604

Ambient temperature: 22 °C

Flow temperature: 76 °C

Flue gas temperature: 98 °C

Heat output in the boiler circuit: 14,0 kW

Radiation losses from boiler: 0,11 kW

Percentage loss at nominal heat output: 0,8 %

Measuring point A1 A2 A3 A4 A5 B1 B2 B3 B4 B5

temperature [°C] 25 26 23 23 23 22 23 22 22 22

Measuring point C1 C2 C3 C4 C5 D1 D2 D3 D4 D5

temperature [°C] 26 28 27 26 26 25 23 23 25 23

Measuring point E1 E2 E3 E4 E5 F1 F2 F3 F4 F5

temperature [°C] 24 32 23 23 22 38 34 29 27 31

Measuring point G1 G2 G3 G4 G5 H1 H2 H3 H4 H5

temperature [°C] 30 31 31 29 31 34 33 27 32 30

G 2,G 1

G 3

G 5,G 4

F 2,F 1

F 3

F 5,F 4

A 1 A 3 A 2

A 4 A 5

B 1 B 2

B 3

B 4 B 5

C 4,C 1 C 3 C 5,C 2

E 1 ,E 2

E 3

E 5 ,E 4

D 1 D 2

D 3

D 4 D 5

H 1,H 4 H 3 H 2,H 5 H 4 ,H 5 H 3 H 1 ,H 2
- 13 - (215/01)

FUNCTION CHECK OF THE TEMPERATURE CONTROLLER / SAFETY TEMPERATURE 

LIMITER ON THE BOILER

The functional check of the temperature controller was performed in accordance with section 

5.13 of ÖNORM EN 303-5 by operating the boiler at nominal heat output with wood pellets. 

The flow temperature at test start amounted to 71,0 °C, the heat loss was reduced to 40%. 

After 13 minutes the highest flow temperature of 97,3 °C was reached.

The functional check of the safety temperature limiter was performed at nominal heat output. 

At a flow temperature of 70,2 °C the heat loss was reduced to 40% by disconnecting the 

temperature controller. After 5 minutes the heating was powered off at 94,7 °C by the safety 

temperature limiter. A minute later the highest flow temperature was reached at 100,5 °C. 

Therefore the requirements were fulfilled in accordance with section 5.13 of ÖNORM EN 

303-5.

Since the tested pellet burner HMS HP 14 from the company HMS Heiztechnik 

Maschinenbau Service Hofer & Manglberger OEG is not equipped with a device to dissipate 

the residual heat as described in section 4.1.5.11.3 of ÖNORM EN 303-5, the operating and 

fault conditions associated with a power outage and sudden loss of heat extraction were 

simulated in order to satisfy the definition of a burner system with a rapid shutdown facility.

At a flow temperature of 72,1 °C at nominal heat output the power supply was cut off for 

control and the heat flow was turned off. After 13 minutes the highest flow temperature was 

reached at 85,6 °C.

The functional check of the sudden heat loss was performed at nominal heat output. At test 

start the flow temperature amounted to 71,3 °C and the heat loss was reduced to 40%. After 

13 minutes the highest flow temperature was reached at 99,7 °C.

During the course of the checks on the temperature controller, the safety temperature limiter 

and the rapid shutdown facility the content of CO and CO2 in the flue gas was measured. 

Thereby the highest measured value of 7720 ppm CO at a CO2 content of 16,9% was 

registrated.

WATER-SIDE RESISTANCE OF BOILER

The water-side resistance for the flow rates was determined at nominal heat output which 

occured at temperature differences of 10 K and 20 K respectively.

Flow rate

[l/h]

Temperature 

difference [K] 

Water temperature

[°C]

Differential pressure

[mbar]

 600 20 20,9 6,6

1200 10 19,1 26,7
- 14 - (215/01)

ELECTRICAL POWER CONSUMPTION

Load Pel [W] *)

Drive motor – extraction screw 65

Drive motor – stoker screw 67

Draught fan 66

Hot air blower - ignition 1520

Cleaning motor – heat exchanger / grate cleaner 50

*) All values of active power were measured incl. control in stand-by position.

During the test of 367 minutes 500 Wh were took up at nominal output; this complies with 0,6 

% of the nominal heat output.

SUMMARY OF RESULTS

The pellet burner HMS HP 14 from the company HMS Heiztechnik Maschinenbau Service 

Hofer & Manglberger OEG with a nominal heat output of 14,0 kW was tested in the power 

range of 4,1 to 14,0 kW using wood pellets compliant to ÖNORM M 7135 having a diameter 

of 6 mm, a bulk density of 650 kg/m3and a water content of 10,5 % and 10,6%.

Since the boiler flue gas temperature is less than 160 K above room temperature at nominal 

heat output, the boiler manufacturer shall make recommendations in accordance with 

ÖNORM EN 303-5, regarding the flue installation in order to ensure sufficient draught and to 

prevent sooting up of the chimney and condensation. 

The results of the measurements were as follows:

Heat

output

Flue gas 

temperature

Load 

(direct)

Carbon

dioxide

Carbon

monoxide

Organic

carbon

Nitrogen

oxides

Dust

[kW] [°C] [%] [%] [mg/MJ] [mg/MJ] [mg/MJ] [mg/MJ]

Nominal heat output: Wood pellets w = 10,5 %

14,0 96,5 94,9 13,7 28 <1 81 4

Minimum heat output: Wood pellets w = 10,6 %

4,1 68,7 92,9 9,3 75 2 n.g. n.g.

Emission values in mg/MJ (relating to the applied energy)
- 15 - (215/01)

Heat

output

Flue gas

temperature

Load 

(direct)

Carbon

dioxide

Carbon

monoxide

Organic

carbon

Nitrogen

oxides

Dust

[kW] [°C] [%] [%] [mg/m3] [mg/m3] [mg/m3] [mg/m3]

Nominal heat output: Wood pellets w = 10,5 %

14,0 96,5 94,9 13,7 42 1 122 6

Minimum heat output: Wood pellets w = 10,6 %

4,1 68,7 92,9 9,3 114 3 n.g. n.g.

Emission values in mg/m3(relating to 13 % O2)

Based on the results, one can hereby confirm that the pellet burner HMS HP 14 from the 

company HMS Heiztechnik Maschinenbau Service Hofer & Manglberger OEG can be 

provided with the test mark of the Federal Institute for Agricultural Engineering.

Head of department for 

biogenic fuels:

Amtsdirektor Dipl.-HLFL-Ing.

Leopold Lasselsberger e.h.

For the 

report and tests:

Ing.

Harald Baumgartner e.h.

Head of the

Federal Institute:

Hofrat Dipl.-Ing. Dr.

Johann Schrottmaier e.h.

Wieselburg, 13/05/2002