What Temperature Should I Set My Cylinder Thermostat?

What Temperature Should I Set My Cylinder Thermostat? A domestic hot water cylinder thermostat should be set at 60-65oC. This is high enough to kill off harmful bacteria such as Legionella. If you set the thermostat much higher than this the water that comes out of the taps will be too hot and there’ll be

What Size Line Should You Run From The Relief Valve On A Residential Water Heater?

What Size Line Should You Run From The Relief Valve On A Residential Water Heater? The pipe leaving the relief valve should be the same diameter as the exhaust port of the valve — usually 3/4 inch. Moreover, the pipe should be made of a material that is not adversely affected by heat, such as