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Extend the gas-boiler-upgrade Option to combi (no-cylinder) dwellings and add the controls upgrade shared by both boiler shapes. A dwelling has a cylinder or it does not, so the one `gas_boiler_upgrade` Option is shaped per dwelling: - no cylinder -> a gas condensing combi (Table 4b code 104), no cylinder fields touched; - a cylinder -> a regular boiler (code 102) heating it, with the conditional cylinder jacket/thermostat (slice 1). Controls: bring an inadequate boiler control up to full programmer + room thermostat + TRVs (SAP 10.2 Table 4e Group 1 code 2106). "Inadequate" = the Group-1 codes with NO room thermostat (2101, 2102, 2107, 2108, 2109, 2111) — these lack boiler interlock (Table 4c(2) / footnote c) p.171), so adding a room thermostat genuinely improves SAP. Room-thermostatted (2103/2104/2105/2106/2113) or better zone controls (2110/2112) are left unchanged — never downgraded, so no phantom uplift. The with-cylinder cert (control 2106) is therefore untouched and its pin still holds at delta 0. Validated by the combi before/after re-lodgement (cert 001431, gas boiler upgrade - no cylinder): control 2111 "TRVs and bypass" -> 2106, fan flue False->True, SAP code 112 -> 104. Cascade-pinned delta 0 (SAP/CO2/PE). Removed the slice-1 placeholder test asserting no boiler Option fires without a cylinder (the combi Option now correctly fires there). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| ashp_from_gas_boiler_001431_before.pdf | ||
| ashp_from_gas_boiler_instant_hw_001431_before.pdf | ||
| ashp_from_system_boiler_with_cylinder_001431_after.pdf | ||
| ashp_from_system_boiler_with_cylinder_001431_before.pdf | ||
| boiler_combi_gas_001431_after.pdf | ||
| boiler_combi_gas_001431_before.pdf | ||
| boiler_cyl_gas_001431_after.pdf | ||
| boiler_cyl_gas_001431_before.pdf | ||
| cavity_wall_001431_after.pdf | ||
| cavity_wall_001431_before.pdf | ||
| double_glazing_001431_after.pdf | ||
| double_glazing_001431_before.pdf | ||
| flat_roof_001431_after.pdf | ||
| flat_roof_001431_before.pdf | ||
| google_building_insights_001431.json | ||
| hhr_storage_001431_after.pdf | ||
| hhr_storage_from_electric_storage_001431_before.pdf | ||
| hhr_storage_from_no_system_001431_before.pdf | ||
| loft_001431_after.pdf | ||
| loft_001431_before.pdf | ||
| loft_thatched_001431_after.pdf | ||
| loft_thatched_001431_before.pdf | ||
| low_energy_lighting_some_leds_001431_after.pdf | ||
| low_energy_lighting_some_leds_001431_before.pdf | ||
| low_energy_lighting_zero_leds_001431_after.pdf | ||
| low_energy_lighting_zero_leds_001431_before.pdf | ||
| secondary_glazing_001431_after.pdf | ||
| secondary_glazing_001431_before.pdf | ||
| sloping_ceiling_001431_after.pdf | ||
| sloping_ceiling_001431_before.pdf | ||
| solar_pv_001431_before.pdf | ||
| solar_pv_no_battery_001431_after_1.pdf | ||
| solar_pv_no_battery_001431_after_2.pdf | ||
| solar_pv_no_battery_001431_after_3.pdf | ||
| solar_pv_with_battery_001431_after.pdf | ||
| solid_brick_ewi_001431_after.pdf | ||
| solid_brick_ewi_001431_before.pdf | ||
| solid_brick_iwi_001431_after.pdf | ||
| solid_brick_iwi_001431_before.pdf | ||
| solid_floor_001431_after.pdf | ||
| solid_floor_001431_before.pdf | ||
| suspended_floor_001431_after.pdf | ||
| suspended_floor_001431_before.pdf | ||
| system_built_ewi_001431_after.pdf | ||
| system_built_ewi_001431_before.pdf | ||
| system_built_iwi_001431_after.pdf | ||
| system_built_iwi_001431_before.pdf | ||
| timber_frame_iwi_001431_after.pdf | ||
| timber_frame_iwi_001431_before.pdf | ||