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Now you come to ask............... :wink:

Found new info which fully clarifies this for me... even though it seems to annoy others....... "The Elegance TRV is specially designed for installation on either the flow or return pipework, in any orientation and with the flow of water in any direction" Sorted - End of discussion, and...

As I understand it - the flow arrows are there so you can put the body the right way round at the installation phase. I have used Danfoss ones before where you rotate a sleeve to suit either flow or return pipe use of the valve. Looking again at the description of the one in question, it...

Why do most have flow arrows then?

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...

Pictures of both ends of a bi-directional TRV which doesn't have any flow arrows.<br>Supplier says it doesn't matter - I dont agree....

Just to let you know - Fitting the single check valve on the outlet from the coil worked perfectly. Thanks for your help and advice. Col

Thanks for the confirmation. Think I'll stick with Y plan and just add the check valve - considerably cheaper! Col

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...