Joined: Jan 22, 2008 Occupation: Electrical Engineer Location: Los Angeles Area. Have a question or two? I had an interesting discussion recently about the use of check valves. Julius Ballanco, P.E., CPD, F-ASPE, is president of J.B. Engineering and Code Consulting, P.C. This article was originally titled “The direction of flow” in the June 2016 print edition of Plumbing & Mechanical. Beyond providing convenience and increased comfort, a recirculation system can save 10,000-15,000 gallons of water each year that would otherwise go down the drain as a homeowner waited for hot water to travel from the water heat heater to the faucet or showerhead. The valve is designed to close and keep the hot water in the pipes once it’s up to temperature. Pressure is the energy that moves water through the piping. Protect the Earth – and your water bill in 2019 by saving up to 15,000 gallons of water – plus extra money on your heating bill! Some plumbing contractors have told me they can eliminate the check valve on the recirculating piping by running the pump 24/7. 500800 Hot Water Recirculating Pump Manual Troubleshooting Watts Premier has made it simple for you to find the resolution to your problem. A hot water recirculating pump works by keeping the hot water in your pipes readily available. The reason given for installing the check valve downstream of the flow control valve is to prevent the flow control valve from being subjected to possible swings in pressure or reversals of water flow. However, plumbing water distribution systems are never that simple; rarely does the water always go in the direction we would like. It also helps reduce the fresh water shortage.Wa… For webinar sponsorship information, visit or email If you have two water lines intersecting, the flow is always going to go from high pressure to low pressure. In analyzing this piping layout, it was easy to see where check valves were needed by looking at the direction of flow and possible direction of flow. It returns the hot water back to your heater when you close the hot water faucet. Copyright ©2021. A domestic hot water (DHW) recirculation system can do that as well as prevent lukewarm water from being dumped down the drain by bypassing it into the cold water line. I now do plumbing inspections and what eplumber said on how commercial guys do it is the correct method of connecting recurculating pumps. Hence, hot water will come out of the cold water faucet. That could potentially radiate hot water as well. 247.66 $ 247. In order for your hot water spout to produce hot water, all of the cold water that has been sitting in the pipe must be pushed out of the way. Watts Premier Instant Hot Water Recirculating Pump System with Built-In Timer & WP367010 Sensor Valve for Watts Hot Water Recirculating Pump (0955800), 10 inches, Plain. If the recirculation system connects to the cold water supply to the water heater, the water can reverse course and go into the cold water supply. Saves water, time, and money. Printer Friendly (PDF) Share this Post. The pump runs … When you open a faucet, it only draws hot water from the hot outlet of the water heater. If you run out of pressure, the flow stops. By visiting this website, certain cookies have already been set, which you may delete and block. It has 3/4-inch pipe thread connectors, and you place it in the hot water line next to the water heater or near the fixture that needs the hot water. The ideal situation is still to install a check valve on the recirculating piping. There's an important step in starting up a new hot water recirculation system that has not been mentioned. But I’m not going to say how I do it, so as to not offend those who follow the opposite point of view. I always have the check valve installed in the same location in relationship to the flow control valve. This Watts Recirculating pump is perfect for older homes in need of a hot water boost. I'm a real plumber and eplumber is a real plumber. The stated purpose of this valve is to prevent "thermal cycling", in which the heat differential between the two legs of your recirculating system cause the water to circulate on its own. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. in Munster, Ind. By closing this message or continuing to use our site, you agree to the use of cookies. … But that’s a subject of another column. The conversation regarding check valves all centered around hot water recirculation systems, so let me limit this review to those systems. Visit our Customer Support page to find the answers you're looking for. Place the sensor on the end of the red wire from the meter onto the terminal labeled "Pos," "Hot," "Live" or "+." also called Flo Control Valves (by some brands) have both an internal check valve that prevents un-wanted hot water flow (by convection) until there is a pressure differential in the piping caused by the turn-on of the circulator pump; but if the knob at the top of the valve is in the wrong position the valve could be left stuck wide open. If a fixture is opened to flow water, the pressure in the line is instantly lowered. Where they were once provided as a convenience to clientele, they are now being used as a way to cut costs ar… No more waiting for the water to warm up. Pretty simple philosophy. A sensor valve acts as a passing guard between the hot and cold water pipes below your faucet. Another contractor said, “I use positive displacement pumps, so you can eliminate the check valves.”, Being the instigator that I am, I asked, “How many check valves should there be on a hot water recirculation system and where do you install them?”. Hi all, About 2 years ago I implemented a recirc system in my house that uses a small Taco pump and a third recirc leg. In that situation, the cold water will still flow in reverse and come out some of the hot water faucets. Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jdf405, Feb 2, 2014. jdf405 Electrical Engineer. For a better experience, please enable JavaScript in your browser before proceeding. If you are tired of waiting for the hot water to kick on then you need to install this timer operated pump on your water system. They are required to be controlled with a shutdown period. In stock on December 20, 2020. But who wants hot water out of a faucet before they get the cold water? PROFIT-BASED ENGINEERED VS. EFFICIENCY-BASED ENGINEERED . A check valve must be installed in the line to ensure hot water only goes in one direction. I do not like swing checks in plumbing water distribution systems, ever! That is because the pressure differentials allow the cold water to flow to the fixture rather than the hot water. When hot water is needed, the recirculation pump installed at the fixture purges the water line of cold water and diverts it back into the cold water supply. In that same situation, if the recirculation pump is off and someone opens the hot water faucet near the intersection, cold water will come out and probably continue to come out of the faucet. Many master (ASSE 1017) thermostatic mixing valves do not close off 100% (Caleffi's 521 and 5231 Series, for example). What was just described is an installation where two check valves are necessary: one on the cold water supply to the water heater before the connection of the recirculating piping, and the other on the recirculating piping after the last connection of a hot water fixture. Turned off the recirculating pump (and ball valve before and after pump). When it senses that hot water is returning to the heater, it shuts off the pump. Now, that doesn’t mean that you’ll have hot water circulating 24 hours a day through that line. Getting it to flow in a convection loop is one thing, keeping it from flowing backwards during hot water use is entirely different. Carefully place the sensor on the end of the black wire from the meter onto the terminal block that the wires from the plug connect to first marked "Neu," "Neg," or "-." The purpose of a hot water recirculator is to make sure that your pipes always have hot water in them. Tell me how we can improve. At the furthest point from the boiler, you’ll need a dedicated hot water line that runs back to the tank, creating a perfect hot water loop. A proper design will have a flow control valve installed at the end of the zone to regulate how much water goes through that zone. What was just described is an installation where two check valves are necessary: one on the cold water supply to the water heater before the connection of the recirculating piping, and the other on the recirculating piping after the last connection of a hot water fixture. Without two check valves, the system will not work properly. Check valves in hot water recirc loop. Basically, hot water rises, so if one side is hotter than the other, the hot water … By visiting this website, certain cookies have already been set, which you may delete and block. Problem is that you have it on the wrong side of the recirc pump line, so there's no way to put a check valve there that will stop the water from going that direction. If you think you only need a flow control valve and not a check valve, I can take you to many buildings where the hot water recirculation system failed. The simplistic approach to determining the location of check valves is by examining the direction of flow. Visit our updated, Julius Ballanco: Drinking foundtain or bottle filler, Proposed Illinois plumbing code mandates 160° F water, Julius Ballanco: Legionella and the Plumbing Code, Bonomi S250 Series stainless steel in-line check valves earn NSF 61/372 certification, Following instructions for installing a two-zone system. I want to hear from you. The other problem is you could have an overwhelming demand for hot water in the piping system. This phenomenon doesn’t last long. A temporary bleed is needed past the outlet of the pump and check valve to vent :wink2. One plumbing contractor commented that most plumbers don’t know how and where to install check valves. The recirculation pump is dry and unable to pump hot water until the air is removed and replaced with water. Pump runs, depending on the length and size of the pipe, three to four times an hour for one or two minutes to maintain instant hot water at the faucet. Customer Support . Connecting the recirculating system check valve to the system under the sink furthest away allows the system to provide quick hot water all along the line because the hot water is circulating throughout the house. However, when you get into larger commercial buildings, there are many zones, hence, many check valves. Once you have installed your Instant Hot Water Recirculating System you can locate any issue you are experiencing here and we will walk you through step-by … Hot Water Recirculating Systems Hot Water Recirculating Systems. What about single-family dwellings? One contractor’s opinion was that anytime you have a recirculation system, you need a check valve. Happybuy RS15-6 Hot Water Recirculating Pump 110V Circulation Pump 3/4-Inch NPT 3-speed Recirculation Pump 9.5 Gpm for Water Heater System. Installing a new check valve and recirculating pump - YouTube Endless hot water but hot water pressure throughout the house is dramatically reduced -- 25 percent of the water pressure available on the cold side) Plumber No. Mark, if a master mixing valve does not close off tight at the hot inlet port, you need those 2 "balancing" valves to minimize the amount of hot water going back to the storage. This process saves water, utility costs, and energy and sewer expenses. For years, recirculating pumps have been standard fixtures in quality hotels, gyms and dining establishments, but they are becoming more common in private residential use as well. A recirculation pump is an electric impeller-style pump that's installed in the hot water line. FREE Shipping by Amazon. It is easier to install the check valve when the system is being installed, as opposed to dealing with lawsuits and installing check valves after the building is up and running. As soon as the pressures equalize, the cold water again begins to flow out of the faucet. ABOUT HOT WATER RECIRCULATING PUMPS There are two main components to an effective hot water recirculating system: the recirculating pump installed on the hot water discharge line of your home’s water heater, and the sensor valve installed on the supply lines of a faucet at the farthest distance from the water heater. We all know what direction of flow we want in a piping system. My system uses a Grudfos "UP 10-16 BU/ATLC", which has an internal valve. The Watts Premier 0955801 Sensor Valve Kit for Watts Hot Water Recirculating Pump comes with a sensor valve, two 12 inch supply lines with fittings and two mounting screws. By closing this message or continuing to use our site, you agree to the use of cookies. An aqua-stat is mounted to the hot-water pipe. Helping You to Do It Yourself! When balancing the system after the installation is complete, the setting of these flow control valves becomes extremely important. JavaScript is disabled. Water will take the path of least resistance, and if the line from the bottom of the tank has less resistance than the normal hot, yes, you will need a check valve to prevent diluting the hot with the colder water from the bottom of the tank. It comes down to analyzing the pressure differentials that can occur in a piping system. When water at the faucet cools down, the sensor turns on the pump and shuts it off when hot water arrives. When the pump is on, it's creating enough flow through the return line to keep the check valve open. In this way, the hot water plumbing pipes remain filled with hot water, and you do not have to wait to use hot water. I have the Grundfos UP-10-16 B5/ATLC which doesn't have an internal check valve like yours does. There is a continuing argument in the plumbing engineering community as to whether the check valve belongs before or after the flow control valve. When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions, I have always piped a normal WH recirc through the CW supply. An instant hot water recirculating system usually comes with everything you need to install it. He can be reached at by email at A hot water recirculation pump provides hot water without wasting water. I countered with, “Shouldn’t the engineer designing the system tell the plumbing contractor where the check valves must be installed?”. It is true that if the pump is always running, you may never need the second check valve. Today, users don’t want to wait minutes for hot water to arrive at the faucet or shower when they turn it on — they want it in less than 10 seconds. Easy to install. Design, CMS, Hosting & Web Development :: ePublishing, This website requires certain cookies to work and uses other cookies to help you have the best experience. Please click here to continue without javascript.. All Rights Reserved BNP Media. However, the energy codes no longer allow recirculating pumps to run continuously. 66. His response was very appropriate: “What about single-family dwellings?” Touche! And I will install a check valve to prevent the hot water movement in the wrong direction when the pump is off. It connects between the hot and cold-water shut-off valves at the farthest sink away from the heater. Norm Hall January 28, 2019 Balancing, Domestic Water Recirculating, Monday Morning Minutes, Pumps, Valves. For that matter, what about any water distribution system? This pump be placed over the boiler will circulate the hot water from the tank to your faucet. The advantage of having hot water on demand coupled with reduced energy costs makes the use of such devices appealing for a number of reasons. _____ If the water in the piping system always went in that direction, we would never need a check valve. A hot water recirculation system is designed to provide hot water to each of the home’s hot-water taps instantly. Simple to install, you will not require additional pumps for your hot water line. The Watts Premier 0955801 Sensor Valve Kit for Watts Hot Water Recirculating Pump comes with a sensor valve, two 12 inch supply lines with fittings and two mounting screws. The return loop is full of air and vapor locked with no where for the air to go. Check valves make sure that water only goes in the direction of flow we want. Wondering what that other cold line runs to. Hence, in a recirculating system, the hot water being pumped through the piping always tends to have a higher pressure than the return line to which it connects. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! You verified that it's the check valve when you turned off the gate valve just after it, taking the check valve … You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. When and where do we install check valves? Simple to install, you will not require additional pumps for your hot water line. Hot Water in the Cold Pipe If you turn on the cold water and get hit with hot water instead, you may actually have a problem with the bypass valve that’s a part of your hot water recirculation system, rather than the pump itself., VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Check if electricity is getting to the pump using a voltmeter. If a faucet or fixture is opened to only flow the cold water, the hot recirculating water will flow into the cold water. Our hot water recirculating system supplies hot water instantly at every faucet or shower. Comfort Valve Hot Water Circulator PROBLEMs. Without two check valves, the system will not work properly. Whenever a zone connects to the main piping in the recirculation system, a check valve is required. You should check the specs for your pump. 2: Hot water heater is fine; Replaced the recirculating pump. When we get into a more complex system, there may be multiple zones in the hot water distribution system. In this video, I delve into hot water recirculating pump reviews by going over the details that you will want to know. A timer is used to ensure that the system isn't maintaining the recirculation line when you're away at work or sleeping. Then the pump’s small increase in pressure is lost by a hot water demand greater than anticipated. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Hot Water Recirculation Pumps. To be clear, I’m only speaking about spring-loaded check valves. The prevention of Legionella growth in plumbing systems is a topic on most of our minds. The pump uses the cold-water line to send water back to the water heater! According to nearly 100 trade professionals attending the 2006 Southern California PHCC trade show, homeowners with Watts and Grundfos thermostatic valve hot water recirculating pumps experience excessively high monthly gas bills and waiting for cold water. In this example, hot water may not come out of the faucet until the recirculation pump turns back on. Note that many recirculating system pumps have internal check valves. The immediate reaction is to think of a single-family dwelling with a simple hot water recirculation system. The reason given for having the check valve before the flow control valve is because the flow control valve can be set up with the pressure drop across the check valve already considered. 2 checks and through the cold inlet. There are two types of hot water recirculation pumps available for you to buy.