1609 Tempering Valve Required - Water Heaters - Combination Systems -

Image Text: In order to maximize the capacity of the combination system, the water heater temperature is sometimes turned way up > a TEMPERING VALVE adds a little cold water to the very hot water coming out of the water heater so that it is cool enough for domestic use > fan coil unit > air return > air flow > blower > air flow > filter > furnace coil > water flow > 180 degrees Fahrenheit > thermostat > check valve > pump > cold > hot > cold water > 55 degrees Fahrenheit > mixed (tempered) water to fixtures > 140 degrees Fahrenheit > tempering valve > 180 degrees Fahrenheit > hot water from water heater > gas water heater (high efficiency) (large capacity)