I ran across this 25 gallon water heater today. It was in a nice new home about 2600 sq ft. Had approval stickers for plumbing approval. It had some type of re-circulating system on it. I have not ever seen a 25 gallon water heater set up this way. Any knowledge would be appreciated. Side note - the gas service was off so I could not run water to see how long the hot water would last.

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