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We just bought a house and I removed all the radiators to decorate. I have a back boiler and an Immersion heater I think? A cylinder in the main bedroom with a smaller one above with a pressure gauge? The gauge reads o.5 and i have been told that once i put the radiators back in it will rise back to 1? Is that correct? Also I have been quoted £3000 to replce the system with a Combi boiler? The radiators are quite new, so this seems a lot. We are new to boilers as we have lived in flat with electric heaters for years.