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Posted by Ronald G. Scalzo on March 21, 2007 at 23:13:45:
I just had a Taco 5000 mixing valve installed with a Watts expansion tank on my Burnham Alliance indirect water heater. The heater is now set to 140 degrees and the valve is at 120 degrees. I will experiment with those numbers as time goes on.
The problem is that the cold supply side of the Taco valve is as hot as the hot supply side. This thermosiphoning goes all the way down the cold side to the inlet of the water tank. I'd say thats a good 8' run in 3/4" pipe. I bgt a 3/4" copper trap which the plumbing supply said will help. However I've read about check valves that should also be installed. The supply house did not know of this.
If this is the solution do I use both the trap and the valve (pz let me know what valve to get) and where does the trap and valve go. On the hot or cold side. Thanks...
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