Boiler and water heater connected together?

Old 07-31-18, 06:37 PM
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Boiler and water heater connected together?

Getting familiar with the systems in my son's new house, I discovered that the boiler's water intake is a branch off the HOT line on the water heater. I have never seen this before and was wondering

(a) WHY?


It makes no sense to me.

Thanks in advance for the responses / education.

Old 07-31-18, 11:17 PM
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It had to go to the HOT water out side.
How could you possibly connect to the cold water side with all those couplers there.
At least they took the shortest route possible.

Good questions. Not a proper connection in my mind. If the water heater gets shut off for any reason..... the boiler water is off to. Not sure if hot water is good for the pressure regulator either.
Old 08-01-18, 02:48 AM
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I haven't done that much work on boilers, but I have done some. The boiler shouldn't be taking make up water very often, and feeding it with hot may reduce any thermal shock.

I think it's OK -- seems preferable to feeding a hot boiler with cold water.

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