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Just bought a new bi-directional TRV to suit a new radiator. There are no markings on the body to indicate which way the flow should go. The supplier assures me it doesn't matter, but I always understood it does. Advice appreciated. I have two pictures of the valve to help, one end...

Revamped my sealed heating system recently and noticed that when system is off, the new pipe layout allows the hot water from the vented cylinder to thermal syphon around the circuit, through the boiler and back into the cylinder coil. Question is, is it OK to add a single check valve to the...