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DHW mixing valve and check valve requirements?
One DHW mixing valve installation instructions say a check valves are required, another says "if local code requires check valves", another doesn't say...
Is there something about a DHW mixing valve that triggers need for check valves?
Currently I have no check valves, and no expansion tank, in my entire potable system. Nor do I have a pressure regulator (city pressure is 55psi.) I do have a water tank relief valve.
So if I add a DHW mixing valve (and raise tank temp to 140-150), do I need check valves or anything else?