I'm currently having trouble trying to repressurise my boiler unfortunately, the youtube tutorials and the manual look different to mine! Join the conversation on health. Fill out our form below to get in touch with our team! The latest savings estimates (source: sedbuk) suggest that if you live in a detached home and are replacing an old-style heavyweight boiler with a modern condensing boiler, you will be swapping average fuel bills of £, for £, - a £ saving. Find great.