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reply to John97

Re: Not enough hot water - house has 2 WH connected together.

The lower element is for keeping the water warm, the top element is for heating water as you are using it I believe, so both will never be on at the same time.

Could it be possible one waterheater services one half of the house and the other the other half?

When I installed my new W/H I replaced 2 low boys in parallel with a single low boy and a thermostatic mixing valve. It allows me to set the hot water heater at 150F and the valve at 120F, I get more H/W than if the tank was set at 120F alone.