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

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

Asked by Sharon on 25th Jan 2022
Expert Trade Answers
Best 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."
Answered on 25th Jan 2022 - Member since Jan 2022 - report
"Yes a two-port valve is required to separate the circuit from a radiator circuit"
Answered on 27th Jan 2022 - Member since Jan 2019 - report
"You will definitely need a 2 port valve as this will be controlled by a room thermostat, or else it would run continuously"
Answered on 10th Feb 2022 - Member since Feb 2022 - report
"Yes, it still has to be controlled so it is at a constant temperature and you can switch off in the summer."
Answered on 25th Jan 2022 - Member since Feb 2020 - report
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