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Old 01-17-2012, 08:47 AM   #1
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Water heater install


Hey,

Installing an A.O. Smith Pro Max power vent water heater.

Do I need to install a drip tee in the exhaust before going through the outside wall?
Do I need an expansion tank?
If so, where does it go? What does it do?

Thanks,

Dave

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Old 01-17-2012, 09:11 AM   #2
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Water heater install


You do need an expansion tank. It should go in the cold water line between the cold water shutoff and the tank inlet. It provides an air cushion. Each tankful of water will expand a little when heated and can trip the temperature/pressure relief valve if there is no expansion tank.

(The expansion tank will work anywhere provided there is no closed valve between it and the water heater but the inspector likes to see it quickly when he looks at the water heater.)

I have not read about drip tees in flues but I have heard about water vapor condensing in the flue and running back down into the furnace or water heater.

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Last edited by AllanJ; 01-17-2012 at 09:15 AM.
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Old 01-17-2012, 10:24 AM   #3
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Water heater install


Might read:
http://www.hotwater.com/lit/im/res_gas/315465-000.pdf
talks about venting the unit and what to do about condensate.
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