This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more. Show By closing this message or continuing to use our site, you agree to our cookie policy. Learn More This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more. The AquaMotion AMH2K-7 is designed for plumbing systems with a dedicated return line and a hot water tank (non-tankless). The pump installs into the dedicated return line at the hot water heater. It's a fully automatic stainless union pump with an Aquastat/switch, built-in timer and long tail pieces for mounting. Meets Title 24 in California. Good for up to 250 feet of pipe length. This kit has a timer for activation. The AMH2K-7N is an on-demand version of the AMH2K-7 model system and does NOT have a timer. On-demand gives you the ability to control system activation through a switch or motion sensor. When activated, the pump shuts off after 5 minutes or when the water temperature reaches 105 F. Additional on-demand switches, motion sensors, etc (AMK- parts below) have to be purchased to activate the pump. How a Hot Water Recirculation Pump WorksHot water recirculation pumps work by generating a continuous flow of hot water in your home’s hot water supply line. Systems are available for existing homes and new homes. For an existing home, a retrofit system will work with your cold water line at three points – pipe, pump, and valve (installed at the furthest fixture)– using the cold water line to create a return line. For new construction homes, a dedicated return line is installed and a circulator pump where the return line meets the hot water heater. Three Major Benefits to Hot Water Recirculation Pumps: Depending on the size of your home and the length of the plumbing pipes, some fixtures may require several minutes before hot water arrives from a water heater that might be located some distance away. If you are environmentally conscious, wasting hundreds of gallons of water while you wait for hot water to be delivered isn't acceptable. If you are tired of waiting for hot water or don't like the idea of wasting water, consider installing ahot water recirculating system or having one installed. The principle of these systems is simple: A recirculating pump installed in the plumbing lines creates a loop that slowly and constantly circulates the water in the hot water pipes back into the water heater for reheating. This means that as soon as you open a faucet or turn on a shower, warm water is already present in those pipes, so you don't need to waste water down the draining waiting for the water to heat up. There are many options when it comes to hot water recirculating systems, so you may need to do some research in order to choose the system that is right for you. Traditional Hot Water Recirculating SystemsIn a traditional hot water recirculating system, there is a dedicated return line for the hot water pipes, which runs from the furthest bathroom or fixture back to the water heater. Near the water heater area, a recirculating pump pulls the water from the furthest fixture back into the water heater, creating a loop. This loop keeps hot water going throughout the house so when a fixture is used, hot water is right there. If you have a dedicated return line, then this is a great system to use. You can even get pumps that have timers built in, so the pump only runs during the hours you need it, offering you savings on energy costs. Instant Hot Water Recirculating SystemsThis type of recirculating system does not require a dedicated hot water return loop. It can be installed and used in any house. Instant hot water systems come in many different varieties, so choose what is best for you. The two main pump locations are over-the-water-heater and under-the-sink.
On-Demand Hot Water Recirculating SystemsThis type of recirculating system is similar to the instant recirculating system, but rather than running constantly or at preset timed intervals, it requires the user to activate the pump when hot water is needed. It can be a traditional style with the pump at the water heater with a dedicated return line, or it can be an under-the-sink pump that is installed in the farthest sink and provides hot water throughout the house. When the pump is activated, it will pump cooled water in the hot water pipes back into the cold water pipe and push it back toward the water heater, creating a temporary loop as the water heats up. So, rather than that cooled water being wasted by going down the drain as you wait for hot water to arrive, it is kept in the loop and sent back to the water heater for heating. When the water arriving through the hot water pipe reaches the desired temperature, the pump shuts off, and the hot water runs out the faucet rather than looping back through the cold water pipes. This is a very efficient system because when the hot water is sensed at the pump, it automatically shuts off and stops pushing the water from the hot line into the cold side. Pushing a button may give the impression that you still have to wait for hot water, but the system can be activated by wireless remote or with buttons in multiple locations throughout the house, making it very convenient. Some systems also offer motion sensors that sense the flow of water automatically, turning on and shutting off automatically. Either way, having hot water on-demand is a great option for saving water and conserving energy. Does a recirculating pump need a return line?Not every domestic hot water recirculation system requires a return line. For residential and light commercial applications, there is another way to save water and maintain hot water at the last fixture.
What is a dedicated recirculation line?The Dedicated Recirc System converts an existing hot water circulation line into an efficient on-demand delivery system. The Dedicated Recirc System delivers hot water only when there is a demand: Reducing Energy Costs. Virtually Eliminating Pinhole Leaks.
Can I use PEX for hot water recirculating pump?PEX manufacturers recommend hot water recirculation velocity to be 2–3 fps. For temperatures up to 140° F (60° C), flow maximums should not exceed 3–4 fps or as otherwise recommended by the manufacturer's guidelines. For temperatures greater than 140° F (60° C), follow recommendations by the manufacturer.
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