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Thanks for the advice, problem was solved eventually. There was two walls of calcium in the heat exchanger with an air gap in between them and it was cleared eventually by using an extra strong descaler. The system is now silent again.

To pump a decent amount of water out of a three foot high monolith go for a pump with a two metre head because at three feet you will only get about half the rate at which the pump is rated. A pump with a three foot heat will not lift any water to 3 and a half feet. A pump rated at 4000 lph at...

This system was fitted 18 years ago and is serviced every year. The boiler is a Stelrad, with a DAB 65 pump running 5 x 48" singles,2 x 24" singles and 1 48" double radiators. Recently the boiler started ketteling and making a loud banging noise when the boiler is working. I have flushed the...