Boiler, radiator, and pipe sizing tools.
Estimate the boiler power in kW you need from floor area, ceiling height, insulation level, and climate zone, with a heat-load breakdown.
Open →Find the BTU/h a room air conditioner needs from floor area, using the ENERGY STAR chart with sun, occupant and kitchen adjustments. Cooling only.
Open →Find the required pipe inside diameter from flow rate and water service, then pick the smallest copper type L or M tube and see its actual velocity.
Open →Minimum fall for a horizontal drain by pipe size and code — IPC, IRC, UPC or UK Approved Document H — as inches per foot, mm per metre, percent and 1:N.
Open →Calculate the number of radiator sections needed for a room based on volume, insulation, climate, and section heat output.
Open →Estimate pipe length, heat output, and number of circuits for wet underfloor heating. Supports bathroom, kitchen, living, bedroom room types.
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