I have always known check valves for conventional residential hot water recirculating systems to be on the discharge side of recirculating pump and for there to be isolation valves on both sides of pump and check valve configuration. I have since run into a situation where this is being questioned. Also, in my area the water is extremely hard and wreaks havoc on check valves (sticking closed) and dead heading pump and eventually prematurely burning it out when installed at the base of the water heater where the T.D.S. is highly concentrated. Taco documentation shows on their 006 documentation that it is on the discharge side, however a tech with Taco said it doesn't matter. My question to him was "Then why do you not state either side is fine." Can someone please enlighten me with a code reference so that I may save face. I have the 2003 UPC Training Manual, but it doesn'[t specify. Thank you in advance to any help you can lend. Thank you. Jason (22 year plumbing contractor CA.).
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