Easy Heating Engineer

Room-by-Room Heat Loss

Room-by-room heat loss & emitter sizing.

All changes saved

About the building

Rooms

—

kW

Emitter total

—

kW

Generator (design)

—

kW

Typical load

Totals populate once rooms are calculated. Heat-loss engine arrives in the next build step.

Size radiators →

U-value builder

Easy Room-by-Room Heat Loss
Sources: design temperatures — CIBSE 2025 Weather Data; U-values — RdSAP 10; room design temperatures — MCS MIS 3005-D; method basis — BS EN 12831-1 (via the CIBSE Domestic Heating Design Guide).
© 2026 Stephen Denney.
build 2026-08-29 · tools menu + radiator hand-off
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