Method: steady-state 1-D conduction to
ASTM C680 / ISO 12241 (combined outer coefficient h≈10 W/m²·K, still air) — identical to the free
heat-loss calculator. Material properties: typical published datasheet values at the stated mean temperature — always verify against the specific product datasheet before design. Costs at €0.05/kWh fuel, 8000 h/yr, 82% boiler efficiency, 0.183 kg CO2e/kWh (DESNZ 2024) — every figure restates its assumptions. Indicative engineering reference — not a substitute for design to your project spec.
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