I have a Gloworm 30SXi boiler and it is leaking water from the bottom of the heat exchanger. Read in another post that this is a common fault. Pressure is only 1.2 bar and it does not leak all the time and it is only a drip but obviusly acuumulates a fair amount of water inside after a few days. I had a gas safe plumber round who seemed ok quoted a reasonable price to replace the seal and also replace my hot water valve that is no longer working. He then phoned up saying that it must be the hat exchanger damaged if it is leaking and recommended replacing the whole boiler for £1200. Anyone on here know if it is more likely to just be the gasket/seal on the heat exchanger door? Thanks for any advice.