Selgas
If you have water running out of the “expansion pipe” on your roof then one of three things must be happening, 1. the pressure reducing valve seat is failing allowing excessive water pressure to built up and travel up the expansion pipe to discharge on the roof, 2. The thermostat although new may be faulty in so far as it’s tollerances are concerned – it may reach max set temp switch off the power but not allow the temperature to drop sufficiently before reactivating itself again causing the water in the top of the tank to build up with latient heat and account for the very hot outlet pipe temperature. Before I attempt #3 I would like to know if the cylinder is mains or reduced pressure for certain – please advise.
