What size copper tubing should I use to install sidearm heat exchanger on domestic hot water heater?

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MikeK

MikeK

Member
Oct 12, 2014
48
MN
I need to install my sidearm heat exchanger on to the domestic hot water heater which is 62 gallons. What size copper tubing should I use? I have some 1/2 inch tubing available. The fittings on the sidearm have 3/4 inch pipe thread. I can't find any specific information on this in other places I have looked, even though they have some videos and good schematics.

Thanks.
 
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