Vent on the cold side of water heater when fixtures are lower than heater ?

Dave Carpentier · April 10

Saw a video recently saying that a vent should be installed on a water heater's inlet side, when a sink or such is lower than the heater.

The notion was that the sink could drain water (if you didnt have supply for some reason) and collapse the heater ?

EBEBRATT-Ed · April 10

Could be.

MA where I am requires a vacuum breaker on the cold water line inlet to a tank type water heater between the cold water isolation valve and the tank.

I know some states do not require this. Connecticut I think is one of them.

mattmia2 · April 10

whichever model code michigan's is adapted from requires a vacuum breaker but only if the inlet to the tank is at the bottom.

Larry Weingarten · April 10

Hi, I'm on the other coast and vacuum breakers are only used here on plastic Marathon tanks. I never see them on glass-lined steel tanks. In the old days, tanks were often made of copper, so the vacuum breaker made good sense.

Yours, Larry

Mad Dog_2 · April 10

Very rare occurrence. Mad Dog

Vent on the cold side of water heater when fixtures are lower than heater ?

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