Code which identifies a particular storey in a building part. Lower ground Ground 1st 2nd 3rd 4th 5th 6th Roof space Code which indicates an improvement measure for a property. Loft insulation Cavity wall insulation Hot water cylinder insulation Draughtproofing Low energy lights Cylinder thermostat Heating controls for wet central heating system Heating controls for warm air system Upgrade boiler, same fuel Biomass boiler Biomass room heater with boiler New or replacement storage heaters Replacement warm-air unit Solar water heating Double glazing Secondary glazing Solid wall insulation Condensing oil boiler Change heating to Band A gas condensing boiler (no fuel switch) Change heating to Band A gas condensing boiler (fuel switch) Photovoltaics Wind turbine Code which indicates the type of heating system, as defined in SAP table 4a (codes 901-999). Code which indicates a particular low or zero carbon energy source. Biomass main heating Biomass community heating Biomass community heating for some of heat generation Biomass secondary heating Geothermal heat source Combined heat and power Ground source heat pump Water source heat pump Air source heat pump Solar water heating Solar photovoltaics Wind turbine Community heat pump Code which indicates the type of flue. open flue balanced flue chimney omitted (boiler is in an outhouse, so its flue arrangements are not relevant) unknown (there is a flue, but its type could not be determined) 6 mm 12 mm 16 mm or more Code which indicates the type of SAP data. new dwelling as designed new dwelling as built new extension to existing dwelling new dwelling created by change of use existing dwelling other Code which indicates the SAP version. SAP 2005 version 9.80, dated October 2005 SAP version 9.81, dated January 2008 SAP version 9.82, dated Jun 2008 Code which indicates the type of floor (exposure). basement floor ground floor upper floor (if heat loss area > 0, this area is an exposed floor) Code which indicates the country within the UK, taken from BS 6879. England and Wales Scotland Northern Ireland Code which indicates the region within the UK. Borders East Anglia East Pennines East Scotland Highland Midlands North East England North East Scotland North West England Northern Ireland Orkney Severn Valley Shetland South East England South West England Southern England Thames Valley Wales West Pennines West Scotland Western Isles Code which indicates the type of wall (exposure). basement wall exposed wall sheltered wall Code which indicates how the thermal bridge data has been recorded. default 2002 regulations accredited user defined (global y-value) user defined (individual values) Code which indicates a particular type of thermal bridge. Steel lintel with perforated steel base plate Other lintels (including other steel lintels) Sill Jamb Ground floor Intermediate floor within a dwelling Intermediate floor between dwellings Balcony within a dwelling Balcony between dwellings Eaves (insulation at ceiling level) Eaves (insulation at rafter level) Gable (insulation at ceiling level) Gable (insulation at rafter level) Corner (normal) Corner (inverted) Party wall between dwellings other type 1 other type 2 Code which indicates the compass direction. unknown or unspecified North North East East South East South South West West North West Horizontal (windows and roof windows only) Code which indicates the source of opening data. manufacturer declaration SAP table BFRC data Code which indicates the type of opening. solid door half glazed door door to corridor window roof window Code which indicates the type of heating emitter. radiators underfloor both Code which indicates the type of glazing; if U-value is from BFRC or manufacturer declaration, give as one of - single - double - triple. not applicable (non-glazed door) single double double low-E hard 0.2 double low-E hard 0.15 double low-E soft 0.1 double low-E soft 0.05 triple triple low-E hard 0.2 triple low-E hard 0.15 triple low-E soft 0.1 triple low-E soft 0.05 secondary glazing Code which indicates the type of opening frame. wood PVC metal no break metal 4 mm break metal 8 mm break metal 12 mm break metal 20 mm break metal 32 mm break Code which indicates the amount of window overshading. very little average or unknown more than average heavy Code which indicates the type of conservatory. no conservatory separated unheated conservatory separated heated conservatory not separated Code which indicates whether a pressure test has been done, or whether an assumed value is used. yes (measured value) yes (design value) assumed value no Code which indicates what kind of heating a community heating system is used for. space heating only water heating only space and water heating Codes which indicates where a flat is located within a building. ground floor mid floor top floor Code which indicates the type of floor construction. not suspended timber suspended timber, sealed suspended timber, unsealed Code which indicates the type of wall construction. steel or timber frame other Code which indicates the type of heating system, as defined in SAP tables 4a/4b (codes 101 to 899). CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Manual feed boiler in heated space (mineral or wood) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Manual feed boiler in unheated space (mineral or wood) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Auto (gravity) feed boiler in heated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Auto (gravity) feed boiler in unheated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Wood chip/pellet independent boiler CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Open fire with back boiler to radiators, trapezium grate CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Open fire with back boiler to radiators, rectangular grate CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Closed roomheater with boiler to radiators CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Stove (pellet-fired) with boiler to radiators CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Range cooker boiler (integral oven and boiler) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Solid fuel boilers: Range cooker boiler (independent oven and boiler) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Direct acting electric boiler CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Electric CPSU in heated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Dry core storage boiler in heated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Dry core storage boiler in unheated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Water storage boiler in heated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Electric boilers: Water storage boiler in unheated space CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Ground-to-water heat pump (electric) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Ground-to-water heat pump with auxiliary heater (electric) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Water-to-water heat pump (electric) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Air-to-water heat pump (electric) CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Gas-fired, ground source CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Gas-fired, water source CENTRAL HEATING SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Heat pumps: Gas-fired, air source COMMUNITY HEATING SCHEMES: Community boilers only COMMUNITY HEATING SCHEMES: Community CHP and boilers COMMUNITY HEATING SCHEMES: Community waste heat from power station and boilers COMMUNITY HEATING SCHEMES: Community heat pump COMMUNITY HEATING SCHEMES: Community geothermal heat source and boilers ELECTRIC STORAGE SYSTEMS: Old (large volume) storage heaters ELECTRIC STORAGE SYSTEMS: Modern (slimline) storage heaters ELECTRIC STORAGE SYSTEMS: Convector storage heaters ELECTRIC STORAGE SYSTEMS: Fan storage heaters ELECTRIC STORAGE SYSTEMS: Modern (slimline) storage heaters with Celect-type control ELECTRIC STORAGE SYSTEMS: Convector storage heaters with Celect-type control ELECTRIC STORAGE SYSTEMS: Fan storage heaters with Celect-type control ELECTRIC STORAGE SYSTEMS: Integrated storage/direct acting heater ELECTRIC UNDERFLOOR HEATING: In concrete slab (off-peak only) ELECTRIC UNDERFLOOR HEATING: Integrated (storage/direct acting) ELECTRIC UNDERFLOOR HEATING: Integrated (storage/direct acting) with low (off-peak) tariff control ELECTRIC UNDERFLOOR HEATING: In thin screed (45-60 mm) ELECTRIC UNDERFLOOR HEATING: In timber floor WARM AIR SYSTEMS: Gas-fired warm air with fan-assisted flue: Ducted, on-off control, pre 1998 WARM AIR SYSTEMS: Gas-fired warm air with fan-assisted flue: Ducted, on-off control, 1998 or later WARM AIR SYSTEMS: Gas-fired warm air with fan-assisted flue: Ducted, modulating control, pre 1998 WARM AIR SYSTEMS: Gas-fired warm air with fan-assisted flue: Ducted, modulating control, 1998 or later WARM AIR SYSTEMS: Gas-fired warm air with fan-assisted flue: Roomheater, with in-floor ducts WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Ducted or stub-ducted. on-off control, pre 1998 WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Ducted or stub-ducted. on-off control, 1998 or later WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Ducted or stub-ducted, modulating control, pre 1998 WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Ducted or stub-ducted, modulating control, 1998 or later WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Ducted or stub-ducted with flue heat recovery WARM AIR SYSTEMS: Gas fired warm air with balanced or open flue: Condensing WARM AIR SYSTEMS: Oil-fired warm air: Ducted output (on/off control) WARM AIR SYSTEMS: Oil-fired warm air: Ducted output (modulating control) WARM AIR SYSTEMS: Oil-fired warm air: Stub duct system WARM AIR SYSTEMS: Electric warm air: Electricaire system WARM AIR SYSTEMS: Heat pumps: Ground-to-air heat pump (electric) WARM AIR SYSTEMS: Heat pumps: Ground-to-air heat pump with auxiliary heater (electric) WARM AIR SYSTEMS: Heat pumps: Water-to-air heat pump (electric) WARM AIR SYSTEMS: Heat pumps: Air-to-air heat pump (electric) WARM AIR SYSTEMS: Heat pumps: Gas-fired, ground source WARM AIR SYSTEMS: Heat pumps: Gas-fired, water source WARM AIR SYSTEMS: Heat pumps: Gas-fired, air source ROOM HEATERS: Gas (including LPG) room heaters: Gas fire, open flue, pre-1980 (open fronted) ROOM HEATERS: Gas (including LPG) room heaters: Gas fire, open flue, pre-1980 (open fronted), with back boiler unit ROOM HEATERS: Gas (including LPG) room heaters: Gas fire, open flue, 1980 or later (open fronted), sitting proud of, and sealed to, fireplace opening ROOM HEATERS: Gas (including LPG) room heaters: Gas fire, open flue, 1980 or later (open fronted), sitting proud of, and sealed to, fireplace opening, with back boiler unit ROOM HEATERS: Gas (including LPG) room heaters: Flush fitting Live Fuel Effect gas fire (open fronted), sealed to fireplace opening ROOM HEATERS: Gas (including LPG) room heaters: Flush fitting Live Fuel Effect gas fire (open fronted), sealed to fireplace opening, with back boiler unit ROOM HEATERS: Gas (including LPG) room heaters: Flush fitting Live Fuel Effect gas fire (open fronted), fan assisted, sealed to fireplace opening ROOM HEATERS: Gas (including LPG) room heaters: Gas fire or wall heater, balanced flue ROOM HEATERS: Gas (including LPG) room heaters: Gas fire, closed fronted, fan assisted ROOM HEATERS: Gas (including LPG) room heaters: Condensing gas fire ROOM HEATERS: Gas (including LPG) room heaters: Decorative Fuel Effect gas fire, open to chimney ROOM HEATERS: Gas (including LPG) room heaters: Flueless gas fire, secondary heating only ROOM HEATERS: Oil room heaters: Room heater, pre 2000 ROOM HEATERS: Oil room heaters: Room heater, pre 2000, with boiler (no radiators) ROOM HEATERS: Oil room heaters: Room heater, 2000 or later ROOM HEATERS: Oil room heaters: Room heater, 2000 or later with boiler (no radiators) ROOM HEATERS: Solid fuel room heaters: Open fire in grate ROOM HEATERS: Solid fuel room heaters: Open fire with back boiler (no radiators) ROOM HEATERS: Solid fuel room heaters: Closed room heater ROOM HEATERS: Solid fuel room heaters: Closed room heater with boiler (no radiators) ROOM HEATERS: Solid fuel room heaters: Stove (pellet fired) ROOM HEATERS: Solid fuel room heaters: Stove (pellet fired) with boiler (no radiators) ROOM HEATERS: Electric (direct acting) room heaters: Panel, convector or radiant heaters ROOM HEATERS: Electric (direct acting) room heaters: Fan heaters ROOM HEATERS: Electric (direct acting) room heaters: Portable electric heaters OTHER SPACE HEATING SYSTEMS: Electric ceiling heating Gas boilers (including LPG) 1998 or later: Regular non-condensing with automatic ignition Gas boilers (including LPG) 1998 or later: Regular condensing with automatic ignition Gas boilers (including LPG) 1998 or later: Non-condensing combi with automatic ignition Gas boilers (including LPG) 1998 or later: Condensing combi with automatic ignition Gas boilers (including LPG) 1998 or later: Regular non-condensing with permanent pilot light Gas boilers (including LPG) 1998 or later: Regular condensing with permanent pilot light Gas boilers (including LPG) 1998 or later: Non-condensing combi with permanent pilot light Gas boilers (including LPG) 1998 or later: Condensing combi with permanent pilot light Gas boilers (including LPG) 1998 or later: Back boiler Gas boilers (including LPG) pre-1998, with fan-assisted flue: Low thermal capacity Gas boilers (including LPG) pre-1998, with fan-assisted flue: High or unknown thermal capacity Gas boilers (including LPG) pre-1998, with fan-assisted flue: Combi Gas boilers (including LPG) pre-1998, with fan-assisted flue: Condensing combi Gas boilers (including LPG) pre-1998, with fan-assisted flue: Condensing Gas boilers (including LPG) pre-1998, with balanced or open flue: Wall mounted Gas boilers (including LPG) pre-1998, with balanced or open flue: Floor mounted, pre 1979 Gas boilers (including LPG) pre-1998, with balanced or open flue: Floor mounted, 1979 to 1997 Gas boilers (including LPG) pre-1998, with balanced or open flue: Combi Gas boilers (including LPG) pre-1998, with balanced or open flue: Back boiler Combined Primary Storage Units (CPSU) (mains gas and LPG): With automatic ignition (non-condensing) Combined Primary Storage Units (CPSU) (mains gas and LPG): With automatic ignition (condensing) Combined Primary Storage Units (CPSU) (mains gas and LPG): With permanent pilot (non-condensing) Combined Primary Storage Units (CPSU) (mains gas and LPG): With permanent pilot (condensing) Oil boilers: Standard oil boiler pre-1985 Oil boilers: Standard oil boiler 1985 to 1997 Oil boilers: Standard oil boiler, 1998 or later Oil boilers: Condensing Oil boilers: Combi, pre-1998 Oil boilers: Combi, 1998 or later Oil boilers: Condensing combi Oil boilers: Oil room heater with boiler to radiators, pre 2000 Oil boilers: Oil room heater with boiler to radiators, 2000 or later Range cooker boilers (mains gas and LPG): Single burner with permanent pilot Range cooker boilers (mains gas and LPG): Single burner with automatic ignition Range cooker boilers (mains gas and LPG): Twin burner with permanent pilot (non-condensing) pre 1998 Range cooker boilers (mains gas and LPG): Twin burner with automatic ignition (non-condensing) pre 1998 Range cooker boilers (mains gas and LPG): Twin burner with permanent pilot (non-condensing) 1998 or later Range cooker boilers (mains gas and LPG): Twin burner with automatic ignition (non-condensing) 1998 or later Range cooker boilers (oil): Single burner Range cooker boilers (oil): Twin burner (non-condensing) pre 1998 Range cooker boilers (oil): Twin burner (non-condensing) 1998 or later Code which indicates the type of ventilation. natural with intermittent extract fans natural with passive vents positive input from loft positive input from outside mechanical extract, centralised (MEV c) mechanical extract, decentralised (MEV dc) balanced without heat recovery (MV) balanced with heat recovery (MVHR) Code which indicates the source of SAP data. Applies to both ventilation and heating. from database from manufacturer declaration from SAP table Code which indicates the type of duct. flexible rigid Code which indicates the type of duct insulation. not insulated insulated Code which indicates the type of boiler for the case where the fuel is gas or oil. regular combi CPSU range cooker Code which indicates the type of combi boiler. instantaneous, no store or keep hot primary storage secondary storage CPSU untimed keep-hot by fuel timed keep hot by fuel untimed keep-hot by electricity timed keep hot by electricity untimed keep-hot by fuel and electricity timed keep hot by fuel and electricity Code which indicates the type of heating control, as described in SAP table 4e. Code which indicates the type of underfloor heat emitter. in concrete slab in thin screed in timber floor Code which indicates the type of boiler fuel feed. gravity manual screw other Code which indicates the source of SAP data. Like "SAP-DataSourceCode", but without the "database" option. This is why the enumeration doesn't start at "1". from manufacturer declaration from SAP table Code which indicates the type of thermal store. none hot water only integrated Code which indicates the type of heating distribution system. Piping system <= 1990, not pre-ins, medium/high temp, full flow Piping system <= 1990, pre-insulated, low temp, full flow Piping system >= 1991, pre-insulated, medium temp, variable flow Piping system >= 1991, pre-insulated, low temp, variable flow no corridor heated corridor unheated corridor Code which indicates the type of heating system, as defined in SAP table 4a (codes 901-999). HOT WATER SYSTEMS: From main heating system HOT WATER SYSTEMS: From secondary heater HOT WATER SYSTEMS: Electric immersion (on-peak or off-peak) HOT WATER SYSTEMS: Back boiler (hot water only), gas HOT WATER SYSTEMS: From a circulator built into a gas warm air system, pre 1998 HOT WATER SYSTEMS: From a circulator built into a gas warm air system, 1998 or later HOT WATER SYSTEMS: Single-point gas water heater (instantaneous at point of use) HOT WATER SYSTEMS: Multi-point gas water heater (instantaneous serving several taps) HOT WATER SYSTEMS: Electric instantaneous at point of use HOT WATER SYSTEMS: From hot-water only community scheme Code which indicates the type of heating control, as described in SAP table 4e. BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: No time or thermostatic control of room temperature BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer, no room thermostat BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Room thermostat only BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer and room thermostat BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer and at least two room thermostats BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer, room thermostat and TRVs BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer, TRVs and bypass BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer, TRVs and flow switch BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Programmer, TRVs and boiler energy manager BOILER SYSTEMS WITH RADIATORS OR UNDERFLOOR HEATING: Time and temperature zone control HEAT PUMPS: No time or thermostatic control of room temperature HEAT PUMPS: Programmer, no room thermostat HEAT PUMPS: Room thermostat only HEAT PUMPS: Programmer and room thermostat HEAT PUMPS: Programmer and at least two room thermostats HEAT PUMPS: Programmer, TRVs and bypass HEAT PUMPS: Time and temperature zone control COMMUNITY HEATING SCHEMES: Flat rate charging, no thermostatic control of room temperature COMMUNITY HEATING SCHEMES: Flat rate charging, programmer, no room thermostat COMMUNITY HEATING SCHEMES: Flat rate charging, room thermostat only COMMUNITY HEATING SCHEMES: Flat rate charging, programmer and room thermostat COMMUNITY HEATING SCHEMES: Flat rate charging, programmer and TRVs COMMUNITY HEATING SCHEMES: Charging system linked to use of community system, programmer, and TRVs ELECTRIC STORAGE SYSTEMS: Manual charge control ELECTRIC STORAGE SYSTEMS: Automatic charge control ELECTRIC STORAGE SYSTEMS: Celect-type controls WARM AIR SYSTEMS (including heat pumps with warm air distribution): No thermostatic control of room temperature WARM AIR SYSTEMS (including heat pumps with warm air distribution): Programmer, no room thermostat WARM AIR SYSTEMS (including heat pumps with warm air distribution): Room thermostat only WARM AIR SYSTEMS (including heat pumps with warm air distribution): Programmer and room thermostat WARM AIR SYSTEMS (including heat pumps with warm air distribution): Programmer and at least two room thermostats WARM AIR SYSTEMS (including heat pumps with warm air distribution): Time and temperature zone control ROOM HEATER SYSTEMS: No thermostatic control of room temperature ROOM HEATER SYSTEMS: Appliance thermostats ROOM HEATER SYSTEMS: Programmer and appliance thermostats ROOM HEATER SYSTEMS: Room thermostats only ROOM HEATER SYSTEMS: Programmer and room thermostats OTHER SYSTEMS: No thermostatic control of room temperature OTHER SYSTEMS: Programmer, no room thermostat OTHER SYSTEMS: Room thermostat only OTHER SYSTEMS: Programmer and room thermostat OTHER SYSTEMS: Temperature zone control OTHER SYSTEMS: Time and temperature zone control Code which indicates the form in which a property is built. Detached Semi-Detached End-Terrace Mid-Terrace Enclosed End-Terrace Enclosed Mid-Terrace Code which indicates the type of solar collector. unglazed flat panel evacuated tube Code which indicates the source of solar collector data. default declared values Code which indicates the compass direction. Like SAP-OrientationCode, but without the "unknown" and "horizontal" options. North North East East South East South South West West North West Code which indicates the vertical pitch (angle). horizontal 30 degrees 45 degrees 60 degrees vertical Code which indicates the amount of solar collector overshading. none or very little modest significant heavy Code which indicates the type of hot water storage insulation. factory-applied loose jacket Code which indicates the type of heating fuel, as defined in SAP table 12. Gas: mains gas Gas: bulk LPG Gas: bottled LPG Oil: heating oil Solid fuel: dual fuel appliance (mineral and wood) Solid fuel: house coal Solid fuel: manufactured smokeless fuel Solid fuel: anthracite Solid fuel: wood logs Solid fuel: wood chips Solid fuel: wood pellets (in bags, for secondary heating) Solid fuel: wood pellets (bulk supply in bags, for main heating) Electricity: electricity sold to grid Electricity: electricity displaced from grid Electricity: electricity, unspecified tariff Community heating schemes: heat from heat pump Community heating schemes: heat from boilers - waste combustion Community heating schemes: heat from boilers - biomass Community heating schemes: heat from boilers - biogas Community heating schemes: waste heat from power stations Community heating schemes: geothermal heat source Community heating schemes: heat from CHP Community heating schemes: electricity generated by CHP Code which indicates the type of immersion heater. Dual Single Code which indicates the type of heating system, as defined in SAP tables 4a/4b (codes 101 to 899). Code which indicates the type of terrain. urban suburban rural Code which indicates the type of electricity tariff. standard tariff off-peak 7 hour off-peak 10 hour 24 hour exposed floor semi-exposed upper floor to unheated space semi-exposed upper floor to partially heated space Codes used to indicate a category of main heating system. none boiler with radiators or underfloor heating micro-cogeneration heat pump with radiators or underfloor heating heat pump with warm air distribution community heating system electric storage heaters electric underfloor heating warm air system (not heat pump) room heaters other system Codes used to indicate a category of secondary heating system. Codes are aligned with those of 'SAP-MainHeatingCategoryCode'. none room heaters Code which indicates the type of boiler for the case where the fuel is solid. independent open fire closed room heater England and Wales: before 1900; Scotland: before 1919; Northern Ireland: before 1919 England and Wales: 1900-1929; Scotland: 1919-1929; Northern Ireland: 1919-1929 England and Wales: 1930-1949; Scotland: 1930-1949; Northern Ireland: 1930-1949 England and Wales: 1950-1966; Scotland: 1950-1964; Northern Ireland: 1950-1973 England and Wales: 1967-1975; Scotland: 1965-1975; Northern Ireland: 1974-1977 England and Wales: 1976-1982; Scotland: 1976-1983; Northern Ireland: 1978-1985 England and Wales: 1983-1990; Scotland: 1984-1991; Northern Ireland: 1986-1991 England and Wales: 1991-1995; Scotland: 1992-1998; Northern Ireland: 1992-1999 England and Wales: 1996-2002; Scotland: 1999-2002; Northern Ireland: 2000-2006 England and Wales: 2003-2006; Scotland: 2003-2007; Northern Ireland: not applicable England and Wales: 2007 onwards; Scotland: 2008 onwards; Northern Ireland: 2007 onwards