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Hi all, I am going to be replacing my 3 port valve this weekend and understand that you need to drain the system down first. My question is that looking at the piping my pump has 2 isolating valves either side of it. Can i not just close these and then replace the valve and then reopen...

Hi My new house has had some very dodgy work done to the heating system before i bought it. Basically, what i found when i arrived was a 3 port valve (i am assuming it is 3 port cos it has 3 pipes on it) with no actuator motor attached meaning i have to manually select hot water/heating and...