The controller on the pump has several settings, one is that you can leave the pump on all the time, another setting is to use the timer to have the pump only run at certain times of the day when you know you normally expect hot water like in the mornings or evenings.
The Watts Hot Water Recirculating Pump can be used for nearly any house where you have to wait for the water to get hot at a distant faucet. With 10 draws per day, that will waste almost 31 gallons of water if the water runs for one minute while you wait for it to get hot. Over a year, that equals 11, gallons. The system is not recommended for tankless or instant water heater type systems since those types of systems are based on different methods to heat the water.
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So i bought this unit for my outdoor tankless water heater. Can this be installed under the sink in between the hot water line and sensor valve? This website uses cookies so that we can provide you with the best user experience possible.
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Watts Premier Hot Water Re-Circulating pump provides water to your faucet or shower instantly, eliminating water waste caused by waiting for water to heat up.
This pump offers quiet, maintenance-free operation and includes a programmable timer that can be set to activate the pump only when you need it or set it to run hours a day. The device uses the pump at the water heater and a patented under-sink sensor valve to create a pressure differential.
The pressure differential allows the cold and cool water in the hot water supply line to bypass into the cold water supply line at a low volume through the thermostatically controlled sensor valve, keeping the water in the hot water supply line at a "no-wait" temperature throughout the home. The only difference and main disadvantage with the under sink application is that it will only bring hot water to all of the fixtures BETWEEN the water heater and the sink where the pump is installed.
If there are downstream plumbing fixtures from the pump, then those won't get instant hot water. There are also complete hot water recirculating pump systems, and these are the least common type in my experience. With these systems, it is installed in the same way as the above hot water pump system except for the fact that there is a separate return line back to the water heater created a dedicated loop.
So instead of using the cold water supply line as a return, it has it's own dedicated return water line. With this type of system, the dedicated return water line branches off the hot water line at the farthest fixture from the water heater behind the wall, not under the sink.
The dedicated return water line connects to the bottom of the water heater which is where the circulating pump is installed rather than at the top.
The main benefit is that you get hot water faster than without a dedicated return line because water doesn't have to be kept in the hot water line in order to keep the cold water supply available. Remember, without a separate return line, the water pump is using the cold water SUPPLY line to send water back to the water pump for a brief time. So when the pump stops working, it can't keep using the cold water supply line because you won't be able to have cold water.
But if you have a separate dedicated return line, then the water in the hot water line can be constantly drained which means that when you are ready for hot water through the recirculating pump you get hot water much more quickly. The main disadvantage with the complete recirculating system is the cost to install a dedicated return line. It may be worth it in a very large house, but it would still be costly. Most of these installations are in new construction.
Hot water recirculating pumps are a great way to get almost instant hot water to your showers and sinks. In essence, it is a simple water pump that turns on when the water drops to a particular temperature usually around 85 degrees. Then, the water pump shuts off when the water hits around 95 degrees.
Hot water recirculation pumps use a special valve with a temperature sensor installed at the farthest sink called a sensor valve.
The valve opens and closes which turns the pump on. You can have additional control over the recirculating pump by using a timer or a switch so it will only turn on when you are home. In addition to hot water recirculators, there are also on demand single fixture heaters that you can install for a single shower. Read my guide on all of the ways to get an instant hot water shower. I hope you enjoyed my article. If you have any questions or comments , please leave it at the bottom of this article in the comment box.
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