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Heat-­‐Flo, Inc.| Solar Hot Water Storage Tanks Page| 13
Solar Piping
HOT WATER RECIRCULATION
Hot Water Recirculation for Solar Tanks
Hot water recirculation is for the continuous circulation of hot water for instant hot water at
the hot water faucets. With the solar tanks, tappings are provided for the hot water
recirculation return at the distance mid-­‐height at the side of the tank. See Figure 7. The
location of the tapping will not allow for the mixing of back-­‐up heated hot water (boiler indirect
of electric element) into the lower solar heated section of the tank.
When an anti-­‐scald device is installed, it is critical to feed the cold supply of the mixing valve
with the return of recirculated hot water. This is important to keep the hot water recirculation
loop operating through the mixing valve even if the tank temperatures are above the mixing
valve setting. Otherwise, the mixing valve will not allow the flow of hot water through it and
disable the recirculation loop of hot water.