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Old 04-24-2011, 02:29 PM   #1
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Dual 40 gallon hot water tanks


We have a 2500 square foot house with 2 1/2 baths. House is 11 years old and the original gas hot water tanks are both 40 gallons. Both original tanks are plumbed in series. What are the advantages of having 2 hot water tanks over 1 that is maybe 80 gallons?

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Old 04-24-2011, 02:46 PM   #2
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Dual 40 gallon hot water tanks


It's crucial that when you're using two hot water heaters, they are plumbed in parallel, and all the piping is symetrical. Otherwise, due to water naturally taking the path of least resistance, one of the heaters does all the heating, and the other is just a storage tank.

One big tank is likely a better scenario than two.

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Old 04-24-2011, 03:27 PM   #3
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Dual 40 gallon hot water tanks


The advantage recovery time, unless you are going to purchase a $3000 80 gallon unit there is more BTU's total with 2 x 40 gal residential units.

Piping in parallel is one way to do it, there are many opinions on that one though.

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