BoilerBuying Guide2026-03-10
Can a Combi Boiler Run Underfloor Heating?
Yes — combis can power underfloor heating, often with a mixing valve for lower temperatures.
Underfloor heating works well with combi boilers when set up correctly.
How it works
Underfloor heating runs at lower temperatures than radiators, so a mixing valve or manifold blends the flow to suit.
Considerations
The combi must be sized for the load, and underfloor zones pair well with weather compensation for efficiency.
Key takeaways
- Combis can run underfloor heating
- A mixing valve sets lower temperatures
- Size the combi to the load
- Pairs well with weather compensation
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