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thank you for your info. i suppose that if the boiler stat were to fail, i'd get pumping over. and this could be very dangerous as tmy feed and expansion tank is plastic.

i know that with unvented systems you have to be specially trained to work on them. and that they have also a temperature relief device that opens if both the stat and overheat cut out fail. Thyy also require a 2 port motorised valve as a normal 3 port is always open to the hot water, so would...

Is read about this in a newspaper over a year ago. That is why new immersion heaters have an overheat stat and most modern boilers also have an overheat stat/thermistor. Maybe if the vent pipe become blocked/frozen up etc and the stat failed there would be an explosion....

With open vented hot water systems, what situations (s) can occur such as a fault(s) that could cause an explosion?.... I have heard there is a chance of it, but am not sure how? And would like to for obvious reasons? I know the cylinder has a vent pipe to take away steam if the boiler...