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Going to be changing my central heating pump soon. I'm hoping to get away with just changing the pump head but if I end up changing the whole thing is it best to use a fibre or rubber washer for the joints between the pump and gate valves? Some people have told me to use a rubber washer with...

Hi Everyone, this is my first post so I'd be really grateful for any help given. The 3 amp fuse on my hw/ch system blew the other day, so I tried replacing it and it blew again immediately. I then noticed that the top of the pump housing was wet as the spindle end of the gate valve above it...