Khalim Conn-Kowlessar 152db1aef4 Slice S0380.155: SAP 10.2 Table 4a — heat-pump water-efficiency column dispatch ... SAP 10.2 Table 4a (PDF p.163-164) heat-pump rows split efficiency into two columns — "space" and "water": Code System space water 211 Ground source HP with flow temp <= 35°C 230 170 213 Water source HP with flow temp <= 35°C 230 170 215 Gas-fired GSHP with flow temp <= 35°C 120 84 216 Gas-fired WSHP with flow temp <= 35°C 120 84 217 Gas-fired ASHP with flow temp <= 35°C 110 77 521 Warm-air electric GSHP 230 170 523 Warm-air electric WSHP 230 170 525 Warm-air gas-fired GSHP 120 84 526 Warm-air gas-fired WSHP 120 84 527 Warm-air gas-fired ASHP 110 77 The split reflects real physics: heat pumps lose efficiency raising water to ~55°C DHW temperatures vs ~35°C space-heating flow. ASHP "in other cases" (codes 214, 221, 223, 224) and the "other cases" gas-fired rows (225-227) have space == water = 170 / 84 / 77 — no distinct DHW column. Pre-slice the cascade routed WHC ∈ {901, 902, 914} ("HW from main heating") through `seasonal_efficiency(main_code)`, which only consults the Space column. For SAP code 211 the cascade returned 2.30 (= space) when the spec requires 1.70 (= water). HW fuel kWh undercounted by 26% on the heating-systems corpus gshp variant: cascade 841.47 kWh vs worksheet 1138.46 kWh. New `_TABLE_4A_HEAT_PUMP_WATER_EFFICIENCY` dict (10 codes where Space ≠ Water) consulted in `_water_efficiency_with_category_inherit` before falling through to the existing `seasonal_efficiency` path. Codes where Space == Water keep the legacy inheritance — no behaviour change. Non-HP main heating (boilers, storage heaters) likewise unchanged. Closures (gshp variant — SAP code 211 + WHC=901 + cylinder): HW fuel kWh: 841.47 → 1138.45 (matches worksheet 1138.46) ΔSAP_c: +0.9373 → -0.0178 Δcost: -£21.60 → +£0.41 ΔCO2: -34.98 → +7.06 kg/yr ΔPE: -418.92 → +33.52 kWh/yr No regressions on 40 other corpus variants — gshp is the only fixture that lodges a heat-pump code with diverging Space/Water columns. Cohort-1 ASHP closure (S0380.28 reciprocal interpolation) is unaffected because that path runs through `heat_pump_record` PCDB Appendix N3 when a PCDB Table 362 record is lodged; this fix is the Table 4a fallback for cases without a PCDB record. Extended handover suite: 899 pass / 0 fail. Pyright net-zero (43 → 43). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-06-01 15:13:21 +00:00
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fixtures	Slice S0380.52: cert 000565 Elmhurst-only mapper-driven cascade pin + glazing-label coverage	2026-05-28 22:03:52 +00:00
__init__.py	Map to RdSapSiteNotes from site notes JSON 🟥	2026-04-16 13:54:03 +00:00
test_elmhurst_end_to_end.py	Slice S0380.17: map Elmhurst §11 glazing-type labels to SAP10 codes	2026-05-27 23:05:52 +00:00
test_elmhurst_extractor.py	extract window frame details from elmhurst site notes 🟥	2026-04-27 15:50:25 +00:00
test_end_to_end.py	P6.1 follow-on: unbox BuildingPartIdentifier at backend boundaries	2026-05-20 09:58:23 +00:00
test_extractor.py	Handle wall thickness "Unmeasurable" 🟩	2026-04-30 16:41:16 +00:00
test_heating_systems_corpus.py	Slice S0380.155: SAP 10.2 Table 4a — heat-pump water-efficiency column dispatch	2026-06-01 15:13:21 +00:00
test_pdf.py	rename example site notes to PasHub_ and add Elmhurst example	2026-04-24 13:01:51 +00:00
test_summary_pdf_mapper_chain.py	Slice S0380.143: RdSAP 10 §10.11 Table 29 — derive cylinder insulation defaults from construction age band when §15.1 lodges "No Access"	2026-05-31 21:03:10 +00:00