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We have a small 120v WH at the shop sitting on a mezzanine above the offices. It has a vacuum relief valve as required by code.
Yesterday the city had an outage to change a fire hydrant. My little WH drained dry toasting the element. When they came back up to pressure I had a lot of air. It had been letting air in the whole time the pressure was down.
I had never really thought about this. So I thought I would through it out there. I spose I'll cut a soft seated swing check in the cold feed to prevent this from happening again.
Yesterday the city had an outage to change a fire hydrant. My little WH drained dry toasting the element. When they came back up to pressure I had a lot of air. It had been letting air in the whole time the pressure was down.
I had never really thought about this. So I thought I would through it out there. I spose I'll cut a soft seated swing check in the cold feed to prevent this from happening again.