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SAP 10.2 Table 12a Grid 1 (PDF p.191): an electric room heater (RdSAP main_heating_category 10, e.g. SAP code 691) is direct-acting electric, so it sits on the "Other systems including direct-acting electric" row — 7-hour high-rate fraction 1.00, 10-hour 0.50. It runs on demand, mostly at the HIGH rate; it does NOT earn the 100%-low-rate of overnight storage charging (which is category 7). `_table_12a_system_for_main` only mapped ASHP, so an electric room heater fell through to the "100% low-rate" fallback (5.50 p, £0.0550), under- charging space heating by ~9.79 p/kWh and systematically OVER-rating the cluster. Now maps electric cat-10 mains to OTHER_DIRECT_ACTING_ELECTRIC (gated on `_is_electric_main`, so gas/solid-fuel cat-10 room heaters are excluded). The same Table 12a fraction flows through cost, CO2 (Table 12d) and PE (Table 12e) — all three callers already pre-gate on electric. Mirror of S0380.228 (same fallback bug for electric SECONDARY heating). 1,000-cert 2026 API sample (no worksheet for this cluster — ±0.5-vs-lodged fallback bar): cat-10 mean |err| 9.49 → 7.11, %<0.5 10.4% → 16.7%; headline %<0.5 42.5% → 42.9%, overall mean |err| 2.29 → 2.16. cat-7 (storage) and cat-2 (gas) unchanged. Full §4 suite green (2405 passed). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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