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Add the first boiler-upgrade option to the single "Heating & Hot Water" Recommendation (ADR-0024 expansion): a dwelling whose existing wet boiler heats a hot-water cylinder is offered a new gas condensing boiler, with the cylinder jacketed when under-insulated and given a thermostat when absent. One competing Option (the Optimiser picks <=1), folded into one composite Plan line. The end-state is read from the Elmhurst before/after re-lodgements (cert 001431, gas boiler upgrade - with cylinder), which REVISE ADR-0024: - Target is always a gas condensing boiler, not fuel-preserving: every after lodges fuel 26. Gas->gas always; a non-gas wet boiler ->gas only with a mains-gas connection; electric boilers are left alone (electrification is the upgrade path). Eligibility = wet-boiler SAP code (Table 4a/4b 101-141 / 151-161 / 191-196) + not an electric boiler + mains gas present. - End-state is a Table 4b SAP code, not a PCDB index: code 102 (regular boiler + cylinder). The calculator derives the condensing seasonal efficiency from the code, so no efficiency input exists or is needed. - A modern condensing boiler has a fanned flue: the after flips `fan_flue_present` False->True on every cert (SAP 10.2 Table 4f flue-fan + the Table 4b condensing-efficiency basis). Added as a new HeatingOverlay field, routed to main_heating_details[0]. - Cylinder thermostat is always added when absent (user-locked); the jacket is the 80 mm `cylinder_insulation_type=2` end-state, applied only when the cylinder is below 80 mm (never downgrading a better one). Both are conditional per-dwelling components, not a frozen overlay. Cascade-pinned delta-0 (SAP/CO2/PE) against the relodged after via `_assert_overlay_reproduces_after`. NB the absolute SAP on this dwelling is subject to a separate Summary-path mapper roof-fidelity gap (we read the roof better-insulated than Elmhurst, scoring ~75 vs the printed 56); the gap is identical on before+after (the boiler measure never touches the roof) so it cancels and the pin still proves the exact heating field-delta. Tracked on the calculator branch. Wires the new `gas_boiler_upgrade` MeasureType through contingencies (0.26), the offline sample catalogue, the catalogue-coverage list, and the ARA first-run integration seed (the option fires on any mains-gas boiler+cylinder dwelling). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| billing | ||
| fuel_rates | ||
| modelling | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| tasks | ||
| __init__.py | ||
| test_building_geometry.py | ||
| test_postcode.py | ||