Expansion tank can go anywhere.
Randy, I'm telling you, if you run out of a tankless heater with 1/2" you won't have enough flow. You need to run like I said. Sure, you think you have good flow now because a tank water heater doesn’t need flow to give you hot water. Tankless requires flow to operate the burner. Besides, I wouldn't even recommend running 1/2" out of a tank either, but people do. Then they set it up really hot, because of the restriction.
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