A customer complained that his Ariston unvented water heater that he installed himself had leaked water. The model is a 3100306 undersink type. He said that water was leaking from the heater inside the house in his utility room. I asked about the discharge pipe and he looked blank. He said that the pipework took care of the hot water pressure build up. The unvented heater did not seem to have a pressure/temperature relief valve, tundish or pipework to the outside. Nor does it have a pressure reducing valve. A warning label on the front says that if water leaks out to turn off the heater and call an engineer. He poo pooed that idea. Will it eventually blow up or flood the house?
