I'd like to change the 3 way valve on the central heating as the radiators
are getting hot
when just the hot water is selected on my gas boiler. (Valve sezied I'm sure
I've been told I'm not allowed to do it because I'm not corgi registered ?
ks was my response, surely its plumbing  and a bit of electrics, I'm
not touching the gas side of things
anyone like to differ ?
 drain system, swap valve, refill system inc inhibitor, wire valve.