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Thank you Wayne

I don't see too many ID heaters here with tempering valves installed. They are required now on new installations. On existing systems I've installed them for the sole purpose of getting more hot water from the existing water heater and/or consistent hot water temperature out of the water...

Hi John, I understand your point but keep in mind that at the water heater the cold side never gets hot. Its still "cold" or room temperature at worst. Never hot. The manifold under the farthest sink basically has a pin-head hole in it that moves a very small amount of hot water into the cold...

Wow. Thanks for all the responses. However, I think I didn't make myself clear as to what was being installed and/or asked. Watts (and Grundfros) make a recirc pump that typically mounts to the hot outlet on top of the water heater. The pump has a clock/timer that tells the circ to move water...

A customer has a large house and it takes a long time to deliver hot water to the farthest fixture in the house. In the past I have successfully installed the Watts (or Grundfros) Recirc pump system at the water heater. However we also want to install a mixing valve/tempering valve at the water...