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Re: 25 gallon water heater
Was this re-circulating system plumbed with 1/4 copper tubing? I've heard they do this so that water is hot at the fixture as soon as you turn it on.
It is done in case where the source is far from the water heater. The system pumps just enough water through the lines to keep the hot supply heated up. When you turn the faucet on, you don't need to wait for hot water. It's right there waiting.
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