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Thanks for the replies. It's a Tower 2 port zone valve. There is a small arm that sticks out. Should this be set to manual, auto or half way?

Hello I have underfloor heating, which only seems to work when the hot water is on. The temperature settings are all set correctly. However, the temperature starts to drop and the only way to get it warm again is by turning the hot water on. The person i bought the house off told me...