BTU Calculator
Calculate the heat output each room needs · BS EN 442 compliant (Δt 50°C)
–BTU/h
–Watts
Enter your room details to see the heat output you need.
Shop cast iron radiators
Calculated at Δt 50°C to BS EN 442. We recommend choosing a radiator with output 5–10% above the calculated figure; an oversized radiator can always be regulated with a thermostatic valve (TRV). Figures are guidance — for a precise specification, call us on 0161 843 8163.