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I've got to connect to some old 1/2 inch copper pipes. Is there enough clearance in the 15mm speedfit type connectors, or have I got to find some 1/2 inch olives from somewhere? Or any other way?

My recently installed unvented C/H system boiler occasionally produces a loud roaring noise on start up. This sometimes lasts a couple of seconds but usually remains until it shuts down. The noise sounds to me as if the air/gas mixture is wrong, like we used to have on a bunsen burner back in...

I was going to have our ancient oil fired boiler replaced with a gas combi, but having read through the various postings, I now think it would be better to fit a conventional unit. I have only researched combi units so far, so the question is, are all boilers now balanced flue? As it looks...