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7 Jan 2001 at 5:05 am
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Either line is fine. I usually install them on the cold side just because I don’t like the combination of heat and pressure, even though the tank is rated for it. The warm water in the tank won’t be useable as hot water drawdown anyway since the pressure is always above that of the precharge in the tank.
Just be sure to install it downstream of an back-check devices!