This tab and all the following tabs contain data used exclusively by the Carbon Index Method.
The boxes on this tab correspond closely to those in Section 2 (Ventilation rate) of the SAP worksheet (boxes 7-25),. For guidance, see Section 2 of SAP 2001.
Number of chimneys
Number of flues
Number of fans and passive vents
Ventilation rate for flueless gas fire (m3/hour) – add 40 m3/s for each flueless gas fire if present
Has a pressurisation test been done?
If yes,
L50
If no,
Number of storeys
Construction type
Floor type
Is there a draught lobby?
Percentage of windows & doors draughtstripped
Number of sides on which sheltered
Ventilation type
Select Natural, Mechanical with heat recovery or Mechanical without heat recovery.
SAP 4 & 10. Water heating
The boxes on this tab relate to those in Section 4 (Water-heating energy requirements, boxes 39-52), and Section 10 (Fuel costs, boxes, 88-100 and 89*-100*) of the SAP worksheet. For guidance, see Sections 4 and 10 of SAP 2001.
Water heating system (SAP Table 4a)
Indicate the system used to provide hot water. The options (with the exception of the first) are those appearing in SAP Table 4a under ‘HOT-WATER-ONLY HEATING SYSTEMS’, with ‘Independent electric water heating system’ expanded into ‘Immersion heater (single)’ and ‘Immersion heater (dual)’ to provide the input data required for SAP Table 13 or (in the case of heat pumps) SAP Appendix G:
Provided by space heating system (but not heat pumps)
Select this option if hot water is supplied by the space heating system, except in the case where space heating is provided by heat pumps.
Immersion heater (single)
Select this option or the following if space heating is provided by heat pumps.
Immersion heater (dual)
From a heat exchanger built into a gas warm-air system
Single-point gas water heater
Multi-point gas water heater
Water heating fuel
Select a fuel or electricity tariff to be used in SAP Table 12 or, in the case of heat pumps, SAP Appendix G. The fuel must be consistent with the water heating system.
Is water heated by community heating?
This option is set automatically. If the heating system is set to COMMUNITY HEATING SCHEME and Water heating system (SAP Table 4a) is set to ‘Provided by space heating system (but not heat pumps)’, the box is ticked, with consequences for the calculations done in Section 4 of the SAP form.
Is there a hot water tank or other storage device?
If so, the following data must be entered to provide the data for boxes 41-42 of the SAP form:
Hot water storage volume (litres)
Hot water storage type (SAP Table 2) – data required by SAP Table 2 and its footnotes
Is there a cylinder thermostat (SAP Table 2)?
Insulation thickness (mm) (SAP Table 2)
Area of solar panel (0 if none) (m2) – Enter the area of any solar panel used for water heating.
Primary circuit and keep-hot losses (SAP Tables 3 & 4f)
Water heating system type
Pick an appropriate category for SAP Table 3. If space heating is provided by heat pumps, the appropriate setting is ‘Electric immersion heater’.
Combi boiler?
For a combination boiler, enter the following data used in the section of SAP Table 3 labelled ‘Additional losses for combi boilers’, an in the section of SAP Table 4f labelled ‘Electricity for maintaining keep-hot facility of a gas combi boiler’:
Keep-hot facility type
Controlled by time clock?
Electric power rating (W) (0 if unknown)
SAP 5. Internal gains
The boxes on this tab relate to box 53a of Section 5 of the SAP worksheet: Additional gains from Table 5. For guidance, see Section 5 of SAP 2001.
Central heating pump? – Tick if there is a central heating pump (does not apply to community heating)
Warm-air heating system fans? – Tick if there are warm-air heating system fans (does not apply to community heating)
Mechanical ventilation system – Tick if there is a mechanical ventilation system (do not include if either of the two preceding boxes is ticked)
Oil pump, inside dwelling – Tick if there is an oil pump inside the dwelling and therefore contributing to heat gains
SAP 9 & 10. Space-heating
The boxes on this tab relate to Section 9 (Space-heating requirement, SAP boxes 81-87) and Section 10 (Fuel costs, SAP boxes 88-100) of the SAP worksheet, which apply if space and water heating is not provided by community heating. For guidance, see Sections 9 and 10 of SAP 2001.
Heat from secondary system (Table 11 & Appendix F)
The following provide the data for SAP Table 11 (Fraction of heat supplied by secondary heating system), SAP Table 4a (secondary system efficiency for SAP box 84) and the calculation of fuel costs in Section 10 of the SAP form. In the case of electric CPSUs, SAP Appendix F is used in place of Table 11.
Main System - this field, which is used as input to SAP table 11 (for SAP box 82 is set automatically from data entered on the Heating System tab, as follows
When Heating system is ‘CENTRAL HEATING...’ or ‘WARM-AIR SYSTEM’, ‘Main system’ is set to ‘Boiler’, except where ‘Heating system type’ is ‘Heat pumps’, when the setting is ‘Heat pump’.
When Heating system is ‘STORAGE RADIATOR SYSTEM’, ‘Main system’ is set to ‘Fan assisted storage heaters’ or ‘Electric storage heaters not fan assisted’, depending on the Heater type.
When Heating system is ‘ROOM HEATER SYSTEM’, the ‘Main system’ setting depends on ‘Room heater system type’ and ‘Heater type’. When ‘Room heater system type’ is ‘Gas’, the setting is ‘Gas room heaters’. When ‘Room heater system type’ is ‘Solid Fuel’, and ‘Heater type’ is any of the options beginning ‘Open fire...’, the setting is ‘Coal fires or other electric systems’. In all other cases the setting is ‘Coal or electric room heater’.
When Heating system is ‘OTHER SPACE-HEATING SYSTEMS’ (which means Electric ceiling heating) ‘Main system’ is set to ‘Coal fires or other electric systems’
Secondary system – select options from the two boxes describing any secondary heating system for SAP Table 11 and Table 4a (ROOM HEATER SYSTEMS)
Additional Gains (SAP table 4f) - Describe additional gains from SAP Table 4f for inclusion in SAP boxes 87a-87e:
Central heating pumps? – tick if there is a central heating water pump, or a CPSU pump (see SAP Appendix F) or a heat pump (see SAP Appendix G)
Boiler oil pump? – tick in the case of an oil boiler to allow for the oil pump and flue fan
Gas boiler with flue fans? – tick in the case of a gas boiler with a fan-assisted flue
SAP 9* & 10*. Space-heating (community heating)
The boxes on this tab relate to ‘Section 9*’ (Space-heating requirement, SAP boxes 82*-88*), Section 10(*) (Fuel costs, SAP boxes 88-100) of the SAP worksheet, which apply if space and water heating is provided by community heating. For guidance, see Sections 9 and 10 of SAP 2001.
Fuel data from this tab is also used in the sections of the SAP form headed ‘Carbon Index (CI) for individual and community heating without CHP’ and ‘Carbon Index (CI) for community heating schemes with CHP or heat recovered from power stations’.
Community heating schemes use heat from one or more of the following three sources: CHP, recovered heat from power stations, and community boilers.
Fraction of heat from CHP unit or fraction of heat recovered from power station – for SAP box 83*. The remaining fraction is assumed to be provided by community boilers.
Distribution loss factor for group and community schemes (SAP Table 12a) – select an option for the specification of distribution loss factor in SAP box 85*
Community boilers fuel (SAP Table 15) – identify the fuel used by community boilers (if present). In the case of community boilers supplementing CHP or heat recovered from power stations, this will be used to set carbon emission factors in the boxes to the left of SAP boxes 109* and 112*. In the case of community heating without CHP or heat recovered from power stations, this setting is not used.
The following fields apply only to community heating schemes using CHP:
Electrical efficiency of CHP unit (eg 0.3) – for SAP box 101*
Heat efficiency of CHP unit (eg 0.5) – for SAP box 102*
CHP fuel (SAP Table 15) – for SAP box 103*. Select a fuel for use in SAP Table 15: Carbon dioxide emission
CHP heat to power ratio (enter 0 if unknown) – for SAP box 106*
