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Hi everyone I just had a vaillant 937 boiler fitted with a vrt 392 controller fitted on the upstairs landing my question is can I buy another 392 controller and fit it to the same two bus wires which the other one is connected to so I can control it from downstairs? Will they both work if not...

Hi Everyone i have read so many post with the same issue and still dont know what to do i have just had a new vaillant combi 937 fitted and am doing a new bathroom my old boiler was system fed and cold tank. My question is the boiler has 15mm hot outlet should i go up to 22mm into the bath room...

Hi everyone I have an open vented conventional boiler system with a copper tank, i am planning on keeping this system in place and fitting a megaflow system for the hot water my qeustion is does my boiler still need this copper water cylinder to run the central heating? or can i get rid of it...