Radiator Retrofit Checker
Will your existing radiators work with a heat pump?
See how much output standard steel panel radiators can lose when system water temperature is reduced. The result is a screening calculation, not a final retrofit design.
Radiator and temperature data
Use the combined catalogue output of the radiators at ΔT50. If the radiator manufacturer publishes output at the intended low-temperature operating point, that published data takes priority.
Transparent methodΔT uses mean water temperature minus room temperature.
Panel radiator screeningn≈1.3 is used only where better manufacturer data is unavailable.
Room-by-room final checkA whole-house total is not enough for final sizing.
Send the result for engineering review
The screening result is included automatically. Add your contact details and any useful information about the existing system.
Buffer tank or hydraulic separation? Check active water volume, zone closure, multiple pumps and mixed-temperature circuits without applying a universal litres-per-kW rule. Open Hydraulic Precheck