This common but incorrect method of adding a second water heater results in unbalanced flow and stagnation in tank 2.
This common but incorrect method of adding a second water heater results in unbalanced flow and stagnation in tank 2.

One of the first things done by the average homeowner who is running out of hot water is to turn up the thermostat on the storage tank. This actually makes some sense because less hot water is required to achieve the same mixed temperature ratio. Raising the storage temperature from 120°F to 140°F will increase energy costs for a standard water heater just $12 per year on average. However, if the problem is really one of insufficient volume, the only practical solution is to install a bigger water heater.

Adding a new bedroom, or a jetted tub, or a multihead "spa" shower are all good reasons to increase a home's existing hot-water supply. One solution is to install a separate, dedicated water heater to handle the new outlet. But depending on the extent of the re-routed distribution lines, installation of a separate stand-alone water...

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