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The water temperature measured at the pop off valve is 140 degrees F. We get the same reading at 2 of the faucets. The rest of the faucets range from 112 to 120 degrees F. We turned off the hot water at the heater and tested to see if any water came out when we turned on the hot at the fixtures. It did not. We assume that there is nothing crossed. There is a hot water re-circulation line that was added before the slab was poured. It is approximately 120 ft. long and runs in a loop around the house to all of the fixtures. This was added after the rough was completed. In the confusion a cold water line was tied into a hot manifold. We had hot water at the hose bibs and no hot water in the house. We traced the lines and corrected this problem. I have never measured the temperature like this at any other house. Is this drop normal? All of the fixtures are single handle Delta mixing valves. We have checked and adjusted all of them. It seems that we should be able to get the same temperature at all the fixtures if they are run long enough. We cannot. Any ideas would be greatly appreciated.
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Norman.
Bypass the Delta and take temp from hot valve.
KK
*Norman,are the Delts mixing valves the anti scald type? You could be getting cross feeding at the mixing valves, if that is the case. Even if they are not anti- scald, that could still be the case. Turn off one supply (hot or cold) at the valve. Turn the valve on in the direction of the shut off supply. If you get water, you have a bleed over problem.You might also want to check the water pressure at the supply valves. I just recently worked on a similar problem at woork with "hands free" mixing valves. A four pound pressure differance between the hot and cold supply valves was causing the cross bleeding through the anti-scald feature of the mixing valves.By the way 140 degree domestic hot water will hurt the unwary. I would set it back to no more than 120 degrees to be safe. IMHO
*Some anti-scald valves never give you full hot, even when working right (unless you dig inside and remove a piece or two). It is annoying because then you crank the HWH to get a hot bath and end up with the 130-140 scqald hazard that DaveR warns about. And shower valves are the hardest ones in the house to replace! -David
Norman: I had a similar problem and had to install a check valve on the recirculation line. Water was back feeding from the water heater. Without the check valve hot water was being delivered from two parts of the water heater tank, the top hot outlet and the bottom of the tank from the return line. Good luck. Dale