William Keogh
David, I am not sure why anyone would say that you need a pumped Domestic Hot Water if it is gravity fed. If you are changing the Boiler and currently your Domestic Hot Water from your Hot Water Cylinder is on Gravity Feed then you do not need a Domestic Hot Water Pump. You need to ask why you need a Pump and then contact another Plumber and ask them if that is correct, has there may be an exception why you need a pump. Bill Pipe Dreams Plumbing Services, Bournemouth, Dorset