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Very simply, the pump is installed at the water tank as depicted in picture below:
The comfort valve is then installed under the faucet farthest from the water heater. The UP 15 series recirculation pump
moves the hot water from the heater throughout the pipe back to the heater through the cold water line. As the water heats
up at the comfort valve, it closes. When a faucet is turned on, warm water is instantly available for use with no waste.
 What if I have multiple hot water branches?
You will need to get an extra comfort valve for every extra
branch that you have.
if you send the hot water back through the cold water pipes to the water heater, wouldn't
you waste hot water when trying to get cold water?
You lose a little bit because the "cooled off" hot water dumped
into the cold water line heats the cold water a little bit. This is only important if you are drawing a glass of cold water.
More than 99 percent of the cold water is used for other purposes, such as cooking, cleaning, washing the car and toilet flushing.
The slightly warm "cold" water is perfectly fine for all these purposes.
The Grundfos instant hot water system comes
with an 18 month limited warranty.
Timer: 24 hr, 3 position, 15 minute intervals. Electrical Cord: 10' Power: 115 VAC
Pump
Data: Flow Range: 0-3.4 U.S. GPM Head Range: 0-3.5 U.S. Feet Motor: Single Phase, 115V Min. Fluid Temperature 36 Degrees F
Max. Fluid Temperature 150 Degrees F Max. Working Pressure: 145 PSI
Valve Technical Data: Patented Technology Integral
Check Valve
ANSI/NSF61 & IAPMO Approved. CUL/UL/UL EPH/UPC listed.
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