Re: Warm to Hot Water in Toilet
I agree it might be a symptom of cross-over from any mixing valve. You may have a mixing valve to your toilets (to warm the water a bit by adding a trickle of hot water in with the cold) during a fill cycle to prevent condensation on the tank) and now either the fill valve or the flapper need replacement, this could evidence itself as HOT or very warm water in the toilet bowl when flushed. If so replacing the flapper and/or fill valve would resolve the problem.
I would check the cold water inlet pipe to the water heater, check to see if it feels warm when you notice this. If this occurs only after a first flush after a longer period of no water use (such as being away all day at work) it is not uncommon for hot water to back up into the cold lines during a period of non use when you have a water heating storage tank.
Since you indicate this is a newer discovery after seven years, and if there has been no newer installations or modifications to the plumbing, I'd first investigate and check out the water heater, especially if it hasn't been maintained regularly. I'd be checking the TPRV on the water heater/storage tank, water logged expansion tank, and the setting on the water heater. If a fuel fired direct water heater I'd also be flushing sediment from the tank.
Some closed plumbing systems are designed so that the first sign of water heater troubles show up in the toilet tanks first (esp. if no expansion tank), for example a Watts Governor 80 is designed to vent thermal expansion into a toilet tank. If you have a pressure regulator/reducer on your main/cold inlet it may not be working or may have accidentially dialed up to a higher pressure - thus tripping the Govenor 80 but not enough to lift the TPRV (or the TPRV might be stuck). You can check the water pressure with a guage at any hose bib.
Last edited by Gray Watson; 08-11-2009 at 07:52 PM.
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