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Method for heating domestic tap water from heated drain water has valve governed electronically by thermostats to heat additional cold water tank supplying hot water tank
Method for heating domestic tap water from heated drain water has valve governed electronically by thermostats to heat additional cold water tank supplying hot water tank
The additional cold water tank (8) has a heat exchanger through which the used water (1) from hot water appliances (10) is passed when the tank temperature (6) is lower than the drain temperature (5). A separate toilet (9) drain (2) is provided.
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