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My plumber tells me that me that the hot water expansion vessel needs replacing. I've already paid almost £500 in repairs on the heating system (which is only 3 years old), so I was hoping to do this myself. I know that if water comes out of the air valve in the expansion vessel, then the...

While changing a thermostatic valve on our underfloor heating system, it became clear that of the 4 actuators on the manifold (there are 4 heating circuits), only one actually works. The actuators are from Watts Industries. Is it likely that three of the 4 have failed, or is there more likely...

I have a speedfit underfloor heating system and I think my mixing valve is not working properly. Water from the boiler is hot, but it's luke-warm when going into the heating manifold and no turning of the knob on the mixing valve will change the temp. I've purchased a new valve and would like...