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HeatPumpy calculates heat loss and radiator sizing using EN 12831-1:2017, the same standard used by qualified installers. It's a strong pre-design estimate, but not a substitute for a full on-site survey.

Just your postcode and address. We pull EPC data automatically where available, and you can upload a floorplan to speed things along — defaults are provided for anything missing.

Yes. Every estimated value — U-values, ceiling height, airtightness, ventilation type — can be reviewed and overridden before you run the calculation.

Once your heat loss is calculated, we recommend heat pump models sized to your property's output requirement, along with radiator sizing for each room.

Postcode, address, and EPC data are used only to generate your estimate and are never sold to third parties. See our Privacy Policy for full details.