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Underfloor Heating Kit Calculator
Input your room details and let our calculator do the rest!
1
Design settings
Calculations assume an external design temperature of −1 °C (typical UK winter condition). U-values use typical figures from Approved Document L (2021) and CIBSE Guide A.
2
Add a room
3
Heat source & calculate
Choose your heat source
Prefer personal advice? Our design team will check your figures for free. Call 020 3336 7444.
⚠️ Important Notice
This calculator provides indicative sizing and product guidance for in-screed underfloor heating systems only. All calculations assume a design flow temperature of 50 °C for boiler systems and 40 °C for heat-pump systems, and that the property meets current UK building insulation requirements as a minimum. U-values used are typical figures consistent with Approved Document L (2021) and CIBSE Guide A. Results are for general guidance only. Actual heating design requirements depend on the building’s construction and insulation levels, and must be verified by a qualified architect or building designer with reference to the specific U-values of the building fabric. The Floor Heating Warehouse Ltd cannot accept responsibility for installations or purchases made solely on these results.
This calculator provides indicative sizing and product guidance for in-screed underfloor heating systems only. All calculations assume a design flow temperature of 50 °C for boiler systems and 40 °C for heat-pump systems, and that the property meets current UK building insulation requirements as a minimum. U-values used are typical figures consistent with Approved Document L (2021) and CIBSE Guide A. Results are for general guidance only. Actual heating design requirements depend on the building’s construction and insulation levels, and must be verified by a qualified architect or building designer with reference to the specific U-values of the building fabric. The Floor Heating Warehouse Ltd cannot accept responsibility for installations or purchases made solely on these results.
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