Adds a "build THIS in Elmhurst" specification — dwelling, dual condensing
oil-combi (code 130) heating, combi/no-cylinder DHW (Table 3a keep-hot
600), per-element fabric W/K targets, room-in-roof gables, the 5 vertical
+ 6 roof-of-room windows, lighting (8 LED), no PV — so a generated
worksheet reproduces cert 0240 as closely as possible. Flags the three
load-bearing differences vs case 6 (combi code 130, no cylinder, boiler
interlock PRESENT → no -5pp) that the new worksheet must capture.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Records why case 6 (worksheet-validated dual-oil archetype) did not close
0240's residual: 0240 is API-only with an INTEGER-rounded register target
(PE 122, CO2 6.0), so 0 residual at 1e-4 is not well-posed without a
worksheet. 0240's unvalidated path vs case 6 is the condensing-combi
(code 130) + no-cylinder HW (Table 3a keep-hot 600 kWh) — case 6 used a
regular boiler + cylinder. Recommends generating an exact-0240 worksheet
(or a 'case 7' = case 6 with the combi swapped in) to get a 1e-4 target.
Notes the lodged RHI water_heating 2842.82 already matches the cascade
HW output exactly (HW demand is right; any residual is in efficiency).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
