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FatherOfNine

02:58AM | 08/23/03
Member Since: 08/22/03
4 lifetime posts
Bvhvac
I moved into a 5 year old home with the original water heater installed. It is a "State" 73 gallon unit rated at 40,000 BTUH. I want to connect a GE 40 gallon unit to it rated at 34,000 BTUH. How should I go about this, which one should drain first and which should be the "backup", and what size vent pipe do I need for the gases?

FatherOfNine

06:46AM | 08/24/03
Member Since: 08/22/03
4 lifetime posts
thanks for the reply. Ok so assuming i can find the manuals for each, how then do i come up with the size of the pipe? do i need to hire a professional to do this? I have been told my an HVAC professional that i need to replace my current 5 inch pipe with a 6 inch pipe. I'm not sure how he came up with that but he says it was to code that way.

daveg

03:43PM | 08/24/03
Member Since: 03/01/03
22 lifetime posts
There must be something I'm missing... If they were piped in parallel, when the smaller runs out of water, cool water would mix with the warm water from the larger heater. This would drop the overall hot water temp after the small heater ran out of water. If they were in series, wouldn't you get the total of the two tanks before you started losing temperature? That's what it would seem like to me.

FatherOfNine

05:17PM | 08/24/03
Member Since: 08/22/03
4 lifetime posts
I was wondering the same thing. The solution that was proposed to me at one point by a friend (a non-professional) was to have the more efficient unit feed into the less efficient unit. Set the two temps to be the same. The less efficient unit would be the first tank to service hot water requests and when it's thermostat kicked on, the fill from the more efficient unit would already be hot, turning the less efficient unit's thermostat off quicker, then the more efficient unit's thermostat would kick on and would cause the water to fill back up in its tank and heat up to the same temp as the less efficient unit. This theory sounded good to me but he did stress that I needed to check out the BTU's with a local professional first to make sure that would work. What do you all make of that?
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