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Ok thanks for your help. Have contacted the pump manufacturer to see what they have to say. Cheers.

Thanks for the reply. Not quite sure what you mean though, are you saying that there is something loose and oscillating at a certain frequency in the pump? Thanks.

Hope someone can help with this. I recently fitted a whole house pump to our vented system which all went ok. This is pumping hot and cold to all outlets except toilet, washing machine and kitchen cold tap which are on mains. Cold has it's own feed from cold tank and hot is connected via an...