Is a two-port zone valve needed for underfloor heating?

Question

How do I know whether a two-port zone valve is needed for underfloor heating?

Shaun · Accepted Answer

Hi, most homes don't have a 2 port valve installed on the underfloor circuit, just a 3 port thermostatic mixing valve to regulate the temperature going into the floor. Then you have a separate actuator head to control each circuit. I have in some cases seen a 2 port added to the primary circuit of the underfloor that is connected to a stat kinda like a fail-safe in the event the thermostatic mixer fails, this protects the floor from over heating and causing any potential damage.

The direct answer to your questions is no.

Mal · Answer

Yes a two-port valve is required to separate the circuit from a radiator circuit

Dominic · Answer

You will definitely need a 2 port valve as this will be controlled by a room thermostat, or else it would run continuously

Malcolm · Answer

Yes, it still has to be controlled so it is at a constant temperature and you can switch off in the summer.

Is a two-port zone valve needed for underfloor heating?

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