### APPENDIX 7-A. RECS 2001 VARIABLES AND VALUES
TABLE OF CONTENTS
7-A.1	 INTRODUCTION .................................................................................................7-A-1 7-A.2	 SAMPLE DETERMINATION..............................................................................7-A-1 7-A.2.1 Water Heater ........................................................................................7-A-1 7-A.2.2 Direct Heating Equipment ...................................................................7-A-3 7-A.2.3 Pool Heaters.........................................................................................7-A-5 7-A.3	 RECS 2001 DATABASE VARIABLE DEFINITIONS .......................................7-A-7
LIST OF TABLES Table 7-A.2.1 Selection of RECS 2001 Records by Fuel Type: Water Heaters...............7-A-1 Table 7-A.2.2 List of RECS 2001 Variables Used in Water Heaters ...............................7-A-2 Table 7-A.2.3 Summary of Direct Heating Equipment Household Sample (RECS 2001) ..........................................................................................................7-A-4 Table 7-A.2.4 List of RECS 2001 Variables Used in Direct Heating Equipment ............7-A-5 Table 7-A.2.5 Criteria for Selection of Pool Heaters Household Sample (RECS 2001)..7-A-6 Table 7-A.2.6 List of RECS 2001 Variables Used in Pool Heaters..................................7-A-6 Table 7-A.3.1 Definitions of RECS 2001 Variables Used in Life-Cycle Cost Analysis..7-A-7

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### APPENDIX 7-A. RECS 2001 VARIABLES AND VALUES
7-A.1 INTRODUCTION Using Microsoft ACCESS, DOE created a database containing a subset of the records 1 

### and variables from DOE’s Energy Information Administration (EIA)’s RECS 2001. DOE used this RECS subset in the life-cycle cost (LCC) analysis of the Residential Water Heaters, Direct Heating Equipment, and Pool Heaters Rulemaking. This appendix explains the variable name abbreviations and provides definitions of the variable values. For the entire RECS 2001 dataset, refer to http://www.eia.doe.gov/emeu/recs/recs2001/publicuse2001.html. 7-A.2 SAMPLE DETERMINATION 7-A.2.1 Water Heater The subset of RECS records used for water heaters met all of the following criteria (see Table 7-A.2.1): 1)Used a water heater as the primary source of heated water, 2)Used one of four fuels (electricity, gas, LPG, or oil as a heating fuel), 3) Provided heated water for only one housing unit, 4) Had an indication of water heater size, 5) Had energy consumption greater than zero. Table 7-A.2.1 Selection of RECS 2001 Records by Fuel Type: Water Heaters

Product Class Algorithm # of Records# of US Households Represented (million) Natural Gas FUELH2O = 1 or 2 WHEATOTH = 0 WHEATSIZ = 1 Or 2 Or 3 Or 6 2220 52.2

Electricity FUELH2O = 5 WHEATOTH = 0 WHEATSIZ = 1 Or 2 Or 3 Or 6 1638 36.8

Fuel Oil FUELH2O = 3 WHEATOTH = 0 WHEATSIZ = 1 Or 2 Or 3 Or 6 107 1.7



### The RECS 2001 variables extracted for pool heaters are listed in Table 7-A.2.2

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### Table 7-A.2.2 List of RECS 2001 Variables Used in Water Heaters Variable Description Location Variables REGIONC Census region DIVISION Census division LRGSTATE Large state designation LRG+DIV* Combined large state (LRGSTATE) and census division (DIVISION) CDD65 Cooling Degree-Days to base 65, 1-04 TO 12-04 HDD65 Heating Degree-Days to base 65, 1-04 TO 12-04 Household Characteristics Variables DOEID DOE 4-digit identification number NWEIGHT The Final Weight TYPEHUQ Type of Home: as report by Respondent YEARMADE Year Home Built NCOMBATH Number of Complete Baths FUELH2O Fuel used for heating water, washing or bathing WHEATOTH Main equipment also heat water for apartments WHEATSIZ Size of household's main water heater tank WHEATAGE How old is your household's main water heater NHSLDMEM How many people normally live in this household YEARS1 How many are infants under the age of 1 YEARS2 How many are children between ages of 1 and 12 YEARS3 How many are adults 65 or older YEARS5 How many are between ages 13 and 64 years old ATHOME Is someone at home all day on a typical weekday DISHWASH Does your household use an automatic dishwasher CWASHER Use a clothes washer in home PGASHTWA Who pays natural gas for hot water LPGPAY Who pays for bottled gas PELHOTWA Who pays electric for hot water
7-A-2FOPAY Who pays for fuel oil CELLAR Home Has Basement BASEHEAT Basement/crawl Space heated PRKGPLC1 Home has Garage or Carport CRAWL Home Has Crawl Space WELLPUMP Electric pump for well water WeatherDataCode* Not part of RECS, added to link to weather data (See App. F) TEMPHOME Setting During the day when someone is home TEMPGONE Setting During the day when no one is home TEMPNITE Setting During sleeping hours *Not part of RECS 2001 variables. 

### 7-A.2.2 Direct Heating Equipment The subset of RECS households used for direct heating equipment met all of the following criteria (see Table 7-A.2.3): 1)Used floor/wall pipeless furnace, fireplace or heater as the primary or secondary source of heat, 2)Used a heating fuel that is natural gas or liquefied petroleum gas (LPG), 3) Heated only one housing unit, 4) Primary fireplace equipment has a thermostat or secondary fireplace equipment has a flue vent, and 5) Had energy consumption greater than zero.

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### Table 7-A.2.3 Summary of Direct Heating Equipment Household Sample (RECS 2001)

Category Selection Criteria Fuel Type # of Records # of US Households Represented (million) Primary Equipment

Floor/Wall Furnace EQUIPM = 6 FUELHEAT = 1 Or 2 HEATOTH = 0 BTUNGSPH>0 or BTULPSPH>0 Natural Gas 134 3.1 LPG 11 0.2

Room HeaterEQUIPM = 7 FUELHEAT = 1 Or 2 HEATOTH = 0 BTUNGSPH>0 or BTULPSPH>0 Natural Gas 136 2.8 LPG 53 1.1

Fireplace EQUIPM = 9 FUELHEAT = 1 Or 2 HEATOTH = 0 Number of Housing Units Heated = 1 BTUNGSPH>0 or BTULPSPH>0 THERMAIN = 1 Natural Gas 5 0.1 LPG 3 0.0

Secondary Equipment
Floor/Wall Furnace PIPELESS = 1 PIPEFUEL = 1 or 2 BTUNGSPH>0 or BTULPSPH>0 Natural Gas 7 0.1 LPG 9 0.1

Room HeaterROOMHEAT = 1 RMHTFUEL = 1 or 2 BTUNGSPH>0 or BTULPSPH>0 Natural Gas 47 0.9 LPG 46 0.9 Fireplace CHIMNEY = 1 FPFUEL = 1 or 2 BTUNGSPH>0 or BTULPSPH>0 NGFPFLUE = 1 or 6 Natural Gas 106 2.6 LPG 21 0.4



### The RECS 2001 variables extracted for pool heaters are listed in Table 7-A.2.4

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### Table 7-A.2.4 List of RECS 2001 Variables Used in Direct Heating Equipment Variable Description Location Variables REGIONC Census region DIVISION Census division LRGSTATE Large state designation LRG+DIV* Combined large state (LRGSTATE) and census division (DIVISION) CDD65 Cooling Degree-Days to base 65, 1-04 TO 12-04 HDD65 Heating Degree-Days to base 65, 1-04 TO 12-04 Household Characteristics Variables DOEID DOE 4-digit identification number NWEIGHT 

### The Final Weight YEARMADE 

### Year Home Built EQUIPAGE 

### How old is equipment identified in D-2 heat system FUELUSE* Not part of RECS. Primary or secondary DHE energy consumption. FUEL TYPE* Not part of RECS. Primary or secondary DHE fuel type. SECONDARY EQP?* Not part of RECS. Assigns weather a household has primary or secondary DHE. ENERGY ADJ* Not part of RECS. Assigns weather a household with secondary DHE equipment needs an adjustment to the energy consumption. EQMAMT 

### How much heat main heating equipment provides FUELHEAT 

### Main fuel used for heating home *Not part of RECS 2001 variables. 

### 7-A.2.3 Pool Heaters The subset of records used to select a RECS household sample for pool heaters met all of the following criteria (see Table 7-A.2.5):

1.Has a swimming pool, 2.Used a pool heater to heat pool water, 3.Used a heating fuel that is natural gas or liquefied petroleum gas (LPG), 4.Heater provided heated pool water for only one housing unit.

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### Table 7-A.2.5 Criteria for Selection of Pool Heaters Household Sample (RECS 2001) By Fuel

Type Selection Criteria # of Records# of US Households Represented(million) Natural Gas or propaneFUELPOOL = 1 or 2 BTUNGAPL> 0 or BTULPAPL >0 41 1.0



### The RECS 2001 variables extracted for pool heaters are listed in Table 7-A.2.6.
Table 7-A.2.6 List of RECS 2001 Variables Used in Pool Heaters

Variable Description Location Variables REGIONC Census region DIVISION Census division LRGSTATE Large state designation LRG+DIV* Combined large state (LRGSTATE) and census division (DIVISION) CDD65 Cooling Degree-Days to base 65, 1-04 TO 12-04 HDD65 Heating Degree-Days to base 65, 1-04 TO 12-04 Household Characteristics Variables DOEID DOE 4-digit identification number NWEIGHT 

### The Final Weight TYPEHUQ 

### Type of Home: as report by Respondent YEARMADE 

### Year Home Built SWIMPOOL 

### Does your own swimming pool with filtering system POOL 

### Is it a heated pool FUELPOOL 

### What fuel is used most often to heat pool water RECBATH 

### Does your home have a heated hot tub, spa FUELTUB 

### What fuel is used to the water in hot tub, spa DRYRFUEL 

### What fuel does clothes dryer use FUELFOOD 

### Which fuels is used most for cooking OTHER APPLIANCE* Not part of RECS. Assigns whether a household has either gas cooking or gas clothes dryer appliances. BTUNGAPL 

### Natural Gas Appliance Use

7-A-6BTUPAPL 

### LPG Appliance Use AVG. DRYER-COOKING USE Not part of RECS. Assigns average gas cooking and/or dryer consumption. ADJUSTED FUEL USE Not part of RECS. BTUNGAPL or BTUPAPL minus AVG. DRYERCOOKING USE *Not part of RECS 2001 variables. 

### 7-A.3 RECS 2001 DATABASE VARIABLE DEFINITIONS

The glossary below lists the variable names alphabetically. A brief explanation of the variable name as it appears in the database file follows the name. Table 7-A.3.1 provides the definitions of the variable’s values. Table 7-A.3.1 Definitions of RECS 2001 Variables Used in Life-Cycle Cost Analysis

Variable Definition Location Variables REGIONC Census region 1 = Northeast 2 = Midwest 3 = South 4 = West DIVISION Census division 1 = New England 2 = Middle Atlantic 3 = East North Central 4 = West North Central 5 = South Atlantic 6 = East South Central 7 = West South Central 8 = Mountain 9 = Pacific LRGSTATE Large state designation 1 = New York 2 = California 3 = Texas 4 = Florida

7-A-7LRG+DIV* Combined large state (LRGSTATE) and census division (DIVISION) 1 = New England 2 = Middle Atlantic (not including New York) 3 = East North Central 4 = West North Central 5 = South Atlantic (not including Florida) 6 = East South Central 7 = West South Central (not including Texas) 8 = Mountain 9 = Pacific (not including California) 10 = New York 11 = California 13 = Texas 14 = Florida CDD65 Cooling Degree-Days to base 65, 1-04 TO 12-04 Cooling degree days are the number of degrees the average daily temperature (ADT) is above the base temperature. HDD65 Heating Degree-Days to base 65, 1-04 TO 12-04 Heating degree days are the number of degrees the ADT is below the base temperature. Household Characteristics Variables DOEID DOE 4-digit identification number TYPEHUQ Respondents reported type of home 1 = Mobile Home 2 = Single-Family Detached 3 = Single-Family Attached 4 = Apartment in Building containing 2-4 units 5 = Apartment in Building containing 5 or more units YEARMADE Year home built 1 = Before 1940 2 = 1940-49 3 = 1950-59 4 = 1960-69 5 = 1970-79 6 = 1980 7 = 1981-1989 8 = 1990 9 = 1991-1995 10 = 1996-1998 11 = 1999 12 = 2000 13 = 2001 96 = Don't Know NWEIGHT Final weight Water Heater Variables

7-A-8TYPEHUQ Type of Home: as report by Respondent 1 = Mobile Home 2 = Single-Family detached 3 = Single-Family Attached 4 = Apartment in Building containing 2-4 units 5 = Apartment in Building Containing 5 or more units NCOMBATH Number of Complete Baths FUELH2O Fuel used for heating water, washing or bathing 1 = Natural gas from underground pipes 2 = Bottled gas (LPG or propane) 3 = Fuel oil 4 = Kerosene 5 = Electricity 7 = Wood 8 = Solar 9 = District steam 10 = Coal 99 = No Answer/Not Applicable WHEATOTH Main equipment also heat water for apartments 1 = Yes 0 = No 9 = No Answer/Not Applicable WHEATSIZ Size of household's main water heater tank 1 = Small (30 gallons or less) 2 = Medium (31 to 49 gallons) 3 = Large (50 gallons or more) 5 = Two separate water heaters 0 = Don't have a separate water heater 6 = Don't know 9 = No Answer/Not Applicable WHEATAGE How old is your household's main water heater 1 = Less than 2 years old 2 = 2 to 4 years old 3 = 5 to 9 years old 4 = 10 to 19 years old 5 = 20 years or older 0 = Don't have a separate water heater 96 = Don't know 99 = No Answer/Not Applicable NHSLDMEM How many people normally live in this household 1-15 = Number that live in household YEARS1 How many are infants under the age of 1 0-15 = Number of infants under age 1 YEARS2 How many are children between ages of 1 and 12 0-15 = Number of children between 1 and 12 YEARS3 How many are adults 65 or older 0-15 = Number of adults 65 or older YEARS5 How many are between ages 13 and 64 years old 0-15 = Remaining adults between 13 and 64 7-A-9ATHOME Is someone at home all day on a typical weekday 1 = Yes 0 = No 6 = Don't know DISHWASH Does your household use an automatic dishwasher 1 = Yes 0 = No CWASHER Use a clothes washer in home 0 = No 1 = Yes PGASHTWA Who pays Natural gas for hot water 1 = Household pays 2 = Rent/Fee 3 = Paid to third party 6 = Household with gas wells on their property 9 = No Answer/Not Applicable LPGPAY Who pays for bottled gas 1 = Household pays 2 = Rent/Fee 3 = Paid to third party 4 = Combined household bill 9 = No Answer/Not Applicable PELHTWA Who pays electric for hot water 1 = Household pays 2 = Rent/Fee 3 = Paid to third party 6 = Household with gas wells on their property 9 = No Answer/Not Applicable FOPAY Who pays fuel oil 1 = Household pays 2 = Rent/Fee 3 = Paid to third party 6 = Household with gas wells on their property 9 = No Answer/Not Applicable CELLAR Home Has Basement 0 = No 1 = Yes 9 = Not Applicable BASEHEAT Basement/crawl Space heated 0 = None 1 = All 2 = Part 9 = Not applicable PRKGPLC1 Home has Garage or Carport 0 = No 1 = Yes 9 = Not Applicable

7-A-10CRAWL Home Has Crawl Space 0 = No 1 = Yes 9 = Not Applicable WELLPUMP Electric pump for well water 0 = No 1 = Yes WeatherLocationCode* Not part of RECS, added to link to weather data (See App. F) TEMPHOME Setting During the day when someone is home 40-94 = Temp when someone home 95 = Heat turned off 96 = Don't know 97 = Did not live in unit last winter 98 = Refused 99 = No Answer/Not Applicable TEMPGONE Setting During the day when no one is home 40-94 = Enter degrees Fahrenheit 95 = Heat turned off 96 = Don't know 97 = Did not live in unit last winter 98 = Refused 99 = No Answer/Not Applicable TEMPNITE Setting During sleeping hours 40-94 = Night temp 95 = Heat turned off 96 = Don't know 97 = Did not live in unit last winter 98 = Refused 99 = No Answer/Not Applicable Direct Heating Equipment Variables FUELHEAT Main fuel used for heating home 1 = Natural gas from underground pipes 2 = Bottled gas (LPG or propane) 3 = Fuel oil 4 = Kerosene 5 = Electricity 7 = Wood 8 = Solar 9 = District steam 10 = Coal 99 = No Answer/Not Applicable

7-A-11EQUIPM Type of heating equipment provides the heat 4 = Heat pump 3 = Central warm-air furnace with ducts 2 = Steam/hot water system with radiators 5 = Built-in electric units installed in walls 6 = Built-in floor/wall pipeless furnace 7 = Built-in heater burning gas, oil, kerosene 8 = Heating stove burning wood, coal, coke 10 = Portable electric heaters 11 = Portable kerosene heaters 9 = Fireplace 12 = Cooking stove used to heat and cook 14 = Geothermal heat pump 21 = Equipment not listed 99 = No Answer/Not Applicable EQUIPAGE How old is equipment identified in D-2 heat system 1 = Less than 2 years old 2 = 2 to 4 years old 3 = 5 to 9 years old 4 = 10 to 19 years old 5 = 20 years or older 96 = Don't know 99 = No Answer/Not Applicable PIPELESS Secondary Heating Equipment Built-in floor/wall pipeless furnace 1 = Yes 0 = No 9 = No Answer/Not Applicable ROOMHEAT Secondary Heating Equipment Built-in room heater burning 1 = Yes 0 = No 9 = No Answer/Not Applicable PIPEFUEL What fuel used in secondary pipelines furnace 1 = Natural gas from underground pipes 2 = Bottled gas (LPG or propane) 4 = Kerosene 5 = Electricity 7 = Wood 99 = No Answer/Not Applicable RMHTFUEL What fuel used in secondary room heater 1 = Natural gas from underground pipes 2 = Bottled gas (LPG or propane) 3 = Fuel oil 4 = Kerosene 99 = No Answer/Not Applicable BTUNGSPH Natural gas space heat use estimated thousands of BTU 9999999=Not Applicable BTULPSPH LPG space heat use estimated thousands of BTU 9999999=Not Applicable

7-A-12EQMAMT How much heat main heating equipment provides 1 = Almost all 2 = About three-fourths 3 = Close to half of all your heat 6 = Don't know 9 = No Answer/Not Applicable Pool Heater Variables SWIMPOOL Does your own swimming pool with filtering system 0 = NO 1 = Yes 9 = No Answer/Not Applicable POOL Is it a heated pool 0 = NO 1 = Yes 9 = No Answer/Not Applicable FUELPOOL What fuel is used most often to heat pool water 1 = Natural gas from underground pipes 2 = Bottled Gas (LPG or Propane) 5 = Electricity 8 = Solar 99 = No Answer/Not Applicable BTUNGAPL Natural appliance use estimated thousands of BTU 9999999=Not Applicable BTULPAPL LPG appliance use estimated thousands of BTU 9999999=Not Applicable RECBATH Does your home have a heated hot tub, spa 0 = No 1 = Yes FUELTUB What fuel is used to the water in hot tub, spa 1 = Natural gas from underground pipes 2 = Bottled Gas (LPG or Propane) 3 = Fuel oil 5 = Electricity 8 = Solar 99 = No Answer/Not Applicable DRYRFUEL What fuel does clothes dryer use 1 = Natural gas from underground pipes 2 = Bottled Gas (LPG or Propane) 5 = Electricity 99 = No Answer/Not Applicable FUELFOOD Which fuels is used most for cooking 1 = Natural gas from underground pipes 2 = Bottled gas (LPG or propane) 5 = Electricity 99 = No Answer/Not Applicable *Not part of RECS 2001 variables.

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### REFERENCES
1. U.S. Department of Energy - Energy Information Administration,Residential Energy Consumption Survey: 2001 Public Use Data Files,2001. <http://www.eia.doe.gov/emeu/recs/recs2001/publicuse2001.html>

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