My kitchen sink has a peculiar setup I haven't seem before. The faucet has 3 pipes and there is an electric water heater under the sink. The first pipe brings cold water into the faucet. The second pipe bring cold water from the faucet into the water heater. The third pipe brings warm water from the heater back to the faucet. Why can't the cold water be supplied directly to the water heater without the initial trip to the faucet?
Plumbing – Why does the kitchen faucet have 3 pipes
kitchen-sinkplumbingwater-heater
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Best Answer
This is known as a vented tap.
The valve part of the hot water tap operates on the mains pressure cold water inlet to the heater.
The outlet part of the hot water tap is vented i.e. always open, so the hot water can expand and relieve pressure without restriction.