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There are 3 floors plus attic, good cold water pressure (we changed the water supply pipes to the house at installation to 25mm??) and a Keston Spa unvented 200l cylinder.
I have had a C25 for around 6 years, the first four were a nightmare despite regular servicing and Keston coming to make adjustments because of a "glitch". While, touch wood, the boiler has been behaving itself over the last couple of years, I have absolutely no confidence in it and the inside...