Hot water in cold line


Old 04-27-03, 08:46 PM
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Question Hot water in cold line

Ive seen this asked before but can't find it. I have hot water in my cold water lines. The water heater is electric. any suggestions appreciated.
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Old 04-27-03, 08:59 PM
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do you have hot water anywhere?
Old 04-27-03, 09:09 PM
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I have hot water coming out the hot valves on faucets and also coming out the cold side when initially turned on. Just to make sure i didn't have bad valves in the faucets i checked the main lines in the morning before anyone was up and the hot and cold lines just off the water heater were both hot.
Old 04-28-03, 05:38 AM
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Water expands when heated. This is thw most likely cause of hot water in the cold water line at the heater. Natural convection also occurs where heat goes to cold and this is alos a reason why you have heated water in the cold supply line.
Hot water at a faucet can be caused by the valves letting water pass into the supply line with the lower pressure. This is usually found on the single handle faucets with the ball valve (Delta, Peerless style).

Hope this helps, more questions ask away and someone will answer them...
Old 04-28-03, 05:40 AM
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Are you on public water?
Do you have a Pressure Reducing Valve?
If you do, it creates a closed system, and you may need an expansion tank on the water heater to help prevent this.
Old 04-28-03, 12:34 PM
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If you have any Moen single handle faucets in the house, check them. They cause the problem you have too.

Old 04-28-03, 04:04 PM
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i would probably guess water expansion time i hooked up a refrigerator line and used a tee off the main but it was too close to the hot tank and it would run hot water for a long time befor it would cool down.if i remember it was two 40 gallon hot tanks and copper water lines.the copper was a good conductor of heat so they hot easily.could be the same problem with your lavratory tee in too close to hot tank.
Old 04-30-03, 03:57 PM
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thanks for the input. Unfortunately all faucets are single handle, but on the plus side was getting ready to replace them with two handle faucets. So i'll try that first. thanks the way well water.
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