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At the beginning of last month I had my system boiler and hot water cylinder replaced with a Worcester Bosch Greenstar 25SI. Now this may be coincidental but ever since then I've been hearing a low pitch humming noise pretty much everywhere in the house. It's continuous and does not seem to...

Try again :wink: Over the past couple ofweeks, my Energysaver 40e boiler has been making loud "booming" noises after it's been on for about 10-15 mins. After having removed some of the covers and stood in front of the boiler and watched the events, this what is happening: When the...