After installing a new water heater, I discovered that the Mixet faucet valve in a neaby bathroom tub had what the plumber called "crossover." That is, with the house water back on but the cold water valve to the new heater turned off, the tank began filling with water flowing throught the Mixet (cold to hot line with the valve "off") and then backflowing through the hot water line to the new tank. Replacing the Mixet cartridge doesn't seem to help the problem.
Any suggestions will be greatly appreciated.
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