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Sane advice. Thanks Having never fitted one before, how would I know if it was set too high (or low)?

Hi Hope you can help My Central Heating pump is packing up. An engineer serviced the 10 year old IMI Powermax 135 about a year ago and said that the pump was going to go soon (bearing rumbling) and recently it's started to get worse, so you can hear the rumbling properly. He said it was an...