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When shutting main water supply is it dangerous for water heater?
Wiki User
∙ 13y ago
No, with the main shut off, no water can be taken from the heater so it will just sit there. <<
If the flame is left on and not set to pilot or shut off it can be Very dangerous....
Unlike a boiler that has operating controllers and safety devices such as a low water cut off a residential heater has only an operating controller (aqua-stat ) and the only protection is the T&P which is a last resort.
Suppose the water heater is above any tap and the tap is opened, the tank will drain water and now you have an air pocket that can cause a very violent explosion when the heater fires and compresses the air.
Unlike a steam boiler which has a Hartford loop to help protect against dry firing a water heater has no such protection and if a valve is open or a pipe leaks water WILL BE TAKEN FROM THE HEATER
Wiki User
∙ 13y ago
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