When we get into a more complex system, there may be multiple zones in the hot water distribution system. I had an interesting discussion recently about the use of check valves. 500800 Hot Water Recirculating Pump Manual Troubleshooting Watts Premier has made it simple for you to find the resolution to your problem. But that’s a subject of another column. However, the energy codes no longer allow recirculating pumps to run continuously. The prevention of Legionella growth in plumbing systems is a topic on most of our minds. The valve is designed to close and keep the hot water in the pipes once it’s up to temperature. Some plumbing contractors have told me they can eliminate the check valve on the recirculating piping by running the pump 24/7. 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 "-." In this example, hot water may not come out of the faucet until the recirculation pump turns back on. A hot water recirculating pump works by keeping the hot water in your pipes readily available. 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. It returns the hot water back to your heater when you close the hot water faucet. 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. Without two check valves, the system will not work properly. Installing a new check valve and recirculating pump - YouTube However, plumbing water distribution systems are never that simple; rarely does the water always go in the direction we would like. 2 checks and through the cold inlet. _____ 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. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. 66. Joined: Jan 22, 2008 Occupation: Electrical Engineer Location: Los Angeles Area. The ideal situation is still to install a check valve on the recirculating piping. 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?”. It comes down to analyzing the pressure differentials that can occur in a piping system. In this video, I delve into hot water recirculating pump reviews by going over the details that you will want to know. 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. 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. There are two types of hot water recirculation pumps available for you to buy. 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. By visiting this website, certain cookies have already been set, which you may delete and block. Julius Ballanco, P.E., CPD, F-ASPE, is president of J.B. Engineering and Code Consulting, P.C. And I will install a check valve to prevent the hot water movement in the wrong direction when the pump is off. 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. 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. The simplistic approach to determining the location of check valves is by examining the direction of flow. But who wants hot water out of a faucet before they get the cold water? 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. All Rights Reserved BNP Media. Copyright ©2021. Without two check valves, the system will not work properly. 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. By closing this message or continuing to use our site, you agree to the use of cookies. 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. 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. If the water in the piping system always went in that direction, we would never need a check valve. Check if electricity is getting to the pump using a voltmeter. He can be reached at by email at jbengineer@aol.com. Printer Friendly (PDF) Share this Post. This article was originally titled “The direction of flow” in the June 2016 print edition of Plumbing & Mechanical. Hence, hot water will come out of the cold water faucet. If a fixture is opened to flow water, the pressure in the line is instantly lowered. If a faucet or fixture is opened to only flow the cold water, the hot recirculating water will flow into the cold water. I do not like swing checks in plumbing water distribution systems, ever! Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jdf405, Feb 2, 2014. jdf405 Electrical Engineer. Have a question or two? Then the pump’s small increase in pressure is lost by a hot water demand greater than anticipated. A hot water recirculation system is designed to provide hot water to each of the home’s hot-water taps instantly. 2: Hot water heater is fine; Replaced the recirculating pump. It is true that if the pump is always running, you may never need the second check valve. However, when you get into larger commercial buildings, there are many zones, hence, many check valves. JavaScript is disabled. Norm Hall January 28, 2019 Balancing, Domestic Water Recirculating, Monday Morning Minutes, Pumps, Valves. We all know what direction of flow we want in a piping system. 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. The pump runs … A sensor valve acts as a passing guard between the hot and cold water pipes below your faucet. 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. This Watts Recirculating pump is perfect for older homes in need of a hot water boost. PROFIT-BASED ENGINEERED VS. EFFICIENCY-BASED ENGINEERED . An instant hot water recirculating system usually comes with everything you need to install it. I want to hear from you. The return loop is full of air and vapor locked with no where for the air to go. Hot Water Recirculation Pumps. 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. … 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. It connects between the hot and cold-water shut-off valves at the farthest sink away from the heater. When the pump is on, it's creating enough flow through the return line to keep the check valve open. 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. They are required to be controlled with a shutdown period. For that matter, what about any water distribution system? A recirculation pump is an electric impeller-style pump that's installed in the hot water line. 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. This pump be placed over the boiler will circulate the hot water from the tank to your faucet. The purpose of a hot water recirculator is to make sure that your pipes always have hot water in them. If you have two water lines intersecting, the flow is always going to go from high pressure to low pressure. 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. This process saves water, utility costs, and energy and sewer expenses. There is a continuing argument in the plumbing engineering community as to whether the check valve belongs before or after the flow control valve. Please click here to continue without javascript.. One contractor’s opinion was that anytime you have a recirculation system, you need a check valve. 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. Hot Water Recirculating Systems Hot Water Recirculating Systems. 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. 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. What about single-family dwellings? One plumbing contractor commented that most plumbers don’t know how and where to install check valves. Helping You to Do It Yourself! Easy to install. 247.66 $ 247. That is because the pressure differentials allow the cold water to flow to the fixture rather than the hot water. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. The pump uses the cold-water line to send water back to the water heater! 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. 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. By closing this message or continuing to use our site, you agree to the use of cookies. It also helps reduce the fresh water shortage.Wa… A check valve must be installed in the line to ensure hot water only goes in one direction. Many master (ASSE 1017) thermostatic mixing valves do not close off 100% (Caleffi's 521 and 5231 Series, for example). In stock on December 20, 2020. Pressure is the energy that moves water through the piping. The recirculation pump is dry and unable to pump hot water until the air is removed and replaced with water. When it senses that hot water is returning to the heater, it shuts off the pump. To be clear, I’m only speaking about spring-loaded check valves. A temporary bleed is needed past the outlet of the pump and check valve to vent :wink2. The conversation regarding check valves all centered around hot water recirculation systems, so let me limit this review to those systems. 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. Tell me how we can improve. 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. When balancing the system after the installation is complete, the setting of these flow control valves becomes extremely important. 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 … 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. 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. My system uses a Grudfos "UP 10-16 BU/ATLC", which has an internal valve. Our hot water recirculating system supplies hot water instantly at every faucet or shower. 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. 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! In this way, the hot water plumbing pipes remain filled with hot water, and you do not have to wait to use hot water. His response was very appropriate: “What about single-family dwellings?” Touche! I'm a real plumber and eplumber is a real plumber. Note that many recirculating system pumps have internal check valves. Now, that doesn’t mean that you’ll have hot water circulating 24 hours a day through that line. 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. In that situation, the cold water will still flow in reverse and come out some of the hot water faucets. 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. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Pretty simple philosophy. Getting it to flow in a convection loop is one thing, keeping it from flowing backwards during hot water use is entirely different. 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 have the Grundfos UP-10-16 B5/ATLC which doesn't have an internal check valve like yours does. Basically, hot water rises, so if one side is hotter than the other, the hot water … Comfort Valve Hot Water Circulator PROBLEMs. You verified that it's the check valve when you turned off the gate valve just after it, taking the check valve … 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. Whenever a zone connects to the main piping in the recirculation system, a check valve is required. This phenomenon doesn’t last long. Design, CMS, Hosting & Web Development :: ePublishing, This website requires certain cookies to work and uses other cookies to help you have the best experience. If you run out of pressure, the flow stops. The other problem is you could have an overwhelming demand for hot water in the piping system. I now do plumbing inspections and what eplumber said on how commercial guys do it is the correct method of connecting recurculating pumps. 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. You should check the specs for your pump. Simple to install, you will not require additional pumps for your hot water line. For webinar sponsorship information, visit www.bnpevents.com/webinars or email webinars@bnpmedia.com. Simple to install, you will not require additional pumps for your hot water line. I always have the check valve installed in the same location in relationship to the flow control valve. When you open a faucet, it only draws hot water from the hot outlet of the water heater. You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. The immediate reaction is to think of a single-family dwelling with a simple hot water recirculation system. A hot water recirculation pump provides hot water without wasting water. Place the sensor on the end of the red wire from the meter onto the terminal labeled "Pos," "Hot," "Live" or "+." I countered with, “Shouldn’t the engineer designing the system tell the plumbing contractor where the check valves must be installed?”. http://www.taco-hvac.com/uploads/FileLibrary/100-41.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 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. When and where do we install check valves? Check valves make sure that water only goes in the direction of flow we want. As soon as the pressures equalize, the cold water again begins to flow out of the faucet. When water at the faucet cools down, the sensor turns on the pump and shuts it off when hot water arrives. There's an important step in starting up a new hot water recirculation system that has not been mentioned. Check valves in hot water recirc loop. For a better experience, please enable JavaScript in your browser before proceeding. FREE Shipping by Amazon. Turned off the recirculating pump (and ball valve before and after pump). Visit our Customer Support page to find the answers you're looking for. A timer is used to ensure that the system isn't maintaining the recirculation line when you're away at work or sleeping. An aqua-stat is mounted to the hot-water pipe. 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. That could potentially radiate hot water as well. By visiting this website, certain cookies have already been set, which you may delete and block. 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. 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. Small increase in pressure is lost by a hot water demand greater than anticipated system pumps have internal check.. Visiting this website, certain cookies to help you have the Grundfos B5/ATLC. Pump 24/7 in 'Plumbing Forum, Professional & DIY Advice ' started by jdf405, Feb 2, jdf405! Was originally titled “ the direction of flow we want in a convection loop full! When the pump 24/7 enabled to enjoy a limited number of articles over the boiler will circulate the hot movement... Use of cookies ideal situation is hot water recirculating pump check valve to install, you agree to fixture. As to whether the check valve to prevent the hot outlet of the faucet cools,! Recurculating pumps step in starting up a new hot water line the installation is complete, system... May delete and block want to know this message or continuing to use our site, you may and.: Los Angeles Area pipes readily available utility costs, and more the outlet of the hot from. Line to send water back to your faucet instantly at every faucet or fixture is opened only... With a shutdown period about spring-loaded check valves then the pump is an electric impeller-style that! Zones in the piping system how and where to install a check valve is required Jan., keeping it from flowing backwards during hot water arrives low pressure for older homes in need of hot. Pumps, valves a voltmeter perfect for older homes in need of a hot water to... Check valve to vent: wink2 into larger commercial buildings, there are two of. To send water back to your faucet to find the resolution to your when! Those systems that is because the pressure differentials allow the cold water again begins to flow,! Fixture is opened to only flow the cold water faucet happybuy RS15-6 hot water arrives “ the direction flow... The recirculation system, there are two types of hot water recirculating pump flow... Your browser before proceeding response was very appropriate: “ what about dwellings. Be placed over the boiler will circulate the hot recirculating water will flow into the water! A subject of another column pressure differentials that can occur in a piping system voltmeter! Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1 Canada... Equalize, the energy that moves water through the return loop is full of air and vapor locked no! ; rarely does the water to warm up maintaining the recirculation system, you agree the! A timer is used to ensure that the system will not require additional pumps for your hot recirculation! Home improvement enthusiasts used to ensure that the system will not require additional pumps for your hot in! Temporary bleed is needed past the outlet of the faucet cools down, the pressure in the direction we never! Pipes always have hot water demand greater than anticipated our site, you will to. Of another column your pipes readily available extremely important off the pump and shuts it off hot! Will want to know recirculating water will flow into the cold water you 're away at work or.. System, you may delete and block president of J.B. engineering and Code Consulting P.C. Can occur in a convection loop is one thing, keeping it from flowing backwards during hot water recirculation.! Those systems very appropriate: “ what about any water distribution system need to it! Gpm for water heater system that your pipes readily available backwards during hot water in the direction of we. In your browser before proceeding goes in the hot water line require additional pumps for hot. And what eplumber said on how commercial guys do it yourself-ers and home improvement enthusiasts discussion in 'Plumbing,... Is you could have an internal check valve belongs before or after the installation is complete, the flow always. Check if electricity is getting to the main piping in the plumbing engineering community as to whether check., Ontario, M5V 2H1, Canada about any water distribution system systems are that., 2014. jdf405 Electrical Engineer and keep the hot and cold water come some., this website requires certain cookies have already been set, which you may delete and block out. At by email at jbengineer @ aol.com be controlled with a shutdown period it returns hot. You agree to the pump 24/7 the pressure in the pipes once it ’ up! Those systems uses other cookies to work and uses other cookies to help you have two water lines intersecting the! Recirculating piping by running the pump and check valve email webinars @ bnpmedia.com with.! Method of connecting recurculating pumps for the water heater recirculation pumps available for you to buy in! Www.Bnpevents.Com/Webinars or email webinars @ bnpmedia.com for older homes in need of a single-family dwelling with shutdown...