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Hi all yesterday I replaced the old water pump with a new replacement (178983 Grundfos type) as the old pump was making a lot of noise and leaking badly. Since replacement the pump, I've noticed that the heating although working fine, takes quite a bit longer to heat up. With the old pump, the...

I hope you can help. I've I potterton puma 100e boiler that I'm having problems with, symptons are: Draw water either from the tap or a shower and the boilder makes a loud noise that sounds like a jet engine reversing, followed by a release of air and a click as the pilot light goes out...