Did you know that hot water in a “closed” hot water cylinder is pressurised? So to avoid the risk of a possible explosion, houses will normally have…
- A pressure relief valve on the cylinder for houses on mains pressure
- An open vent of some sort to the outside for houses on low pressure
- A thermostat controlling the water temperature or
- An “over-temperature” cut out switch
If your cylinder is on mains pressure check for a relief valve. Pressure should be released minimum every 6 months if not every 3 months by just “flicking” the valve. Put down a towel down and release the valve slowly just in case any water is dispersed.