Storage water heaters maintain a constant temperature within the tank, monitored by one or more thermostats, which control a burner or heating elements as needed to maintain the desired temperature in the tank. As the water sits in the tank unused, the temperature naturally drops, even though the tank is insulated, triggering the thermostat to heat the water back up to the desired temperature. This stand-by heat loss occurs in all tank style heaters. It wastes energy and reduces the Energy Factor of the heater.
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