Review Of Clayton Home Master Bath Hot Water Not As Hot Ideas. If your bathtub water problem developed gradually over a period of months, it could be caused by hard water, which is water with a high mineral content. It looks as if some part of your house is fed from the combi boiler, and the rest off the unvented cylinder.

No hot water in only one bath tub. When we moved in hot water worked well to all parts of the house. Get rid of the airlock.