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| Re-circulation install/ maintenance tips Troubleshoot laing recirculation pump Troubleshoot grundfos recirculation pump 1 horsepower = 756 watts. Recirculation systems are rated 1/25 Hp 1/25 Hp motor = 30.6 watts 30.6 watts divided by 120 volts = .255 amp Less than 1 amp Recirculation system will not overload any circuit |
Troubleshoot recirculation systemElectrical requirement/ 1 amp  |
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How water heater recirculation system worksPart I: Laing Pump OFFHot water re-circulation system with timer turned offCold water available immediately, but wait for hot water. Water- savings estimate of 15,000 gallon per year is promotional foolery: this amount equals 41 gallons per day or 2 full bathtubs of water per day. Test your home: put empty gallon can under tub spout and see how much water is wasted waiting for hot water. Use water for plants. Buy: Laing recirculation systems |
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How water heater recirculation system worksPart II: Laing Pump ONRe-circulation system with timer turned on.Hot water available, but wait for cold water. Timer saves energy compared with recirculation system that runs full time. Autocirc uses timer, but also turns off when temperature reaches 95, and turns on when water temperature drops to 85.
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 See entire Auto-circ system |
Water heater temperature below 140ºFKeep Water Heater Temperature Below 140ºF (60ºC):High temperatures cause calcium and magnesium to come out of solution and create solids. These solids can damage pump and reduce water heater efficiency. Can cause early water heater failure Resource: How to adjust temp of water heater How to maintain water heater Temperature needed to kill bacterial 140ºF Water temperature inside pipeWhen using thermostat operation, the pump turns ON automatically when temperature inside pipe drops below 85 degrees and then turns OFF when water temperature reaches 95 degrees F.When using Timer, the pump runs for specified amount of time. So if water heater holds very hot water, the full tank temperature will circulate |
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Recirculation crossover valveInstall crossover valve under sink with Hot on left and Cold on rightIf this is reversed, then recirculation system will not work Crossover valve is one-way check valve... lets water through one direction, and then closes when water tried to go other direction. If recirculation has stopped bring hot water, but the pump is working, then replace crossover valve. How it works: "The Comfort Valve® is installed at the fixture furthest away from the hot-water tank. Using timer on pump, hot water circulates along the loop through the valve using the cold-water side as a return line. As the temperature rises to 100 °F (38 ° C), the valve closes directing hot water to the tap, thus resulting in a constant availability of hot water. Buy: Replacement crossover valve Watts sensor valve kit Resource: Example illustrations of installation Read about crossover valve |
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Install pump upright on hot pipeInstall recirculation pump in vertical position on Hot water line.Which pipe on top of water heater is Hot? 1) Usually the cold line has shut off valve. 2) Top of tank also has H and C markings. 3) Turn on Hot water tap for few moments and use hand to check which pipe feels hot. Pump installed sideways will not workResource:Typical plumbing diagrams Installation manual with photographs |
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 Larger image Grundfos installation manual General guide for setting timer |
Choose: Timer or thermostat operation?Choose between 'Timed' operation or 'Thermostatic' operationUse slide switch located on timer dial. Choose timer and Program specific times: Move slide switch to timer. Using timer, the recirculation system runs specific times of day If you use crossover valve installed under sink, then the thermostat will stop the pump when temperature reaches set point. Function of timer is to ensure that pump does not cycle on-off throughout day. Timer must be reset after power outage Or choose Thermostat operation, Move slide switch to ON. Pump runs whenever temperature inside pipe drops below 85-90 degrees and run until temperature reaches 95-100 degrees. Some pumps have variable thermostats and some have higher setting. To turn off the system, slide switch to OFF Resource: General guide for setting timer |
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Timer or thermostat?Timer can save money if scheduled carefully.Thermostat operation runs throughout the day. Hot available any time |
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| Cost
to operate recirculation pump? Using the timer and running Autocirc 1 hour a day costs between $11 and $17 per year to operate. Run autocirc 2 hours a day is $22-34 per year. Run 12 hours a day costs $11-17 per month, or $132-204 per year. This includes pump operation and additional time that water heater operates. See calculations |
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Direct return/ probably saves moneyDoes not use cold water lineRequires dedicated return line connecting to water heater drain port Saves money since water is not wasted waiting for cold to arrive Direct return connects to water heater drain port. Resource: How to remove drain valve Different type of water heater valves How to flush water heater |
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Tankless recirculation systemThree Illustrations show:Top two: direct return line/ Bottom: without direct return line Direct return line is better installation Water must circulate through small water heater to ensure there is hot water in the recirculation loop. Reason: small pump cannot activate tankless burner or element Check valve can be added on direct return hot water line as shown Add check valve to cold water line for loop without direct return System can have faucets that are not connected to recirculation loop... add a small 3 gallon under counter water heater to this faucet Water flow causes pressure. The small pump creates pressure. The check valve between tankless and recirculation loop (on top illustration) will keep recirculation pump from pushing water into tankless. So the pump is just recirculating hot water in the loop. Using hot water during a shower also causes pressure... and when tankless is being operated, the other check valve will keep water from being pushed into small tank and backwards through recirculation loop. It's also true that water flow can cause suction. For example if end of garden hose is left inside a pond after filling pond.... and you turn on water tap inside house... the pull of water can draw water from the pond if the outdoor spigot has a small seep. For example if end of garden hose is left inside a pond after filling pond.... and you turn on water tap inside house... the pull of water can draw water from the pond if the outdoor spigot has a small seep. To prevent this problem, add anti-siphon connection on outdoor spigots. However, in the case of recirculation pumps, the water flow is not very strong, and the system is a closed loop... a closed loop is not drawing water like an open spigot... and the 1/25 Hp recirculation pump is not moving the water very fast, so drawing cold water into the loop is not an issue. Resource: Compare small water heaters Rheem-tankless- Rheem-tankless- Using-point-of-use- Tankless-recirculation.pdf Nortiz-tankless-recirculation-diagram.pdf Water heater valves Which 20 gallon water heaterFor whole house, use water heater with 3/4" pipe fittings1/2" pipe is too small for household size recirculation system 1/2" is for single faucet Resource: Compare small water heaters Which recirculation pump?Each plumbing system is different... distance, diameter of pipe, condition of pipe, number of elbows, ... effect flow of water.Resource: How-to-choose-proper-circulator-pump.pdf Compare recirculation pumps Why isn't there a stronger recirculation pump?Probably faster pump on small residential pipe would just cause water bubbles, and no water movement, and then resistance would overheat pump?How to set up Tankless recirculation |
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 Larger image Connect Hot from tankless to cold water inlet on small hot water heater |
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 Larger image No return line/ not best design Pump can be located on cold water line |
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II. Other Hot water option for sinkPoint of use water heater115 Volt, 2-1/2 Gallon point of use heaters available at most home centersConnect heater to cold water line Use switch or timer Buy: Point of use water heaters at Amazon  Resource: Under-counter water heaters, manuals, and installation How to increase amount of hot water |
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III. Other Hot water options for sinkPot heater or hot water dispenser |
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Autocirc timer dialResources:Larger Autocirc image Auto circ installation manual |
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Taco 265 DIGI timerResource:DIGI cross reference w/ FM1D DIGI 240V manual Taco timer sell sheet Buy: Taco timer at Amazon Taco recirculation at Amazon  |
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Control pump with cell phone using WeMoIf WeMo or Iris offers a delay optionWeMo programming resources are online No subscription WeMo plugs into ordinary 120volt outlet Control WeMo using phone or tablet Buy from my associate links WeMo at Amazon Belkin WeMo at Amazon Unlocked cell phone at Amazon  Unlocked smartphone Resource: How to install recirculation system |
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 Skylink wireless countdown |
Operate recirculation system remotelySkylink wireless countdownSkylink estimate 1/3 Hp Grundfos pump is 1/25 Hp 120V 60 Hz/ 10 watt miminum/ 1500 watt Operate as ON-OFF or Countdown device/ Up to 500 feet 15 minute - 60 minute countdown Buy: Wireless wall mount transmitter TB-318 at Amazon Wireless countdown receiver PA-318 at Amazon Transmitter and receiver Resource: PA-318 manual How to install recirculation system |
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 Off delay timer for recirculation system Push either button to activate delay timer sequence Another wiring example using push button -or- ST01 programmable timer to start delay |
Operate recirculation system remotely from 1-2-3+ different locationsHow it works:Do NOT connect voltage to bell wire going to push buttons Buy delay timer and base Connect 120volt Hot and Neutral wires to base as illustrated. Buy thermostat or bell wire and connect to push buttons as shown The push buttons receive no voltage or power... do not connect to power source. Plug timer into base. Choose delay time from .05 seconds to 999 seconds Push doorbell button. Activates timer. Timer turns ON and begins countdown. Pump turns ON and runs until countdown stops. Countdown is off-delay. When countdown expires, timer turns OFF, pump turns OFF. Delay timer rated 1/3 Hp.... recirculation pump rated 1/25 Hp Buy project materials: Example 50' thermostat bell wire at Amazon 6A855 Solid State timer at Amazon 11-pin plug-in base at Amazon Push button plate Amazon Resource: Other countdown timers More off delay and pin timer illustrations 6A855 Manual |
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Remote control countdown timerOperate recirculation system remotely from different locationAH3 off-delay timerFlip switch and load turns on until delay period expires Buy: 120 volt AH3-3 at Amazon Resource: How to wire AH3-3 timer More countdown timers |
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Remote control countdown timerBuy:120 volt AH3-3 with base at Amazon 6A855 Solid State delay timer at Amazon 11-pin plug-in base at Amazon Woods 32555 at Amazon GE remote at Amazon Wireless remote controls at Amazon Replacement A23 battery at Amazon Select recirculation pump Resource: How to wire AH3-3 timer See analog plug-in timers See remote controls |
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Misc manuals and links/ ResourcesBuy:Grundfos recirculation pumps at Amazon Resources: How to set up Tankless recirculation |
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/ heat pump/ water heaters at AmazonResources: How to install gas water heater How to install electric water heater Troubleshoot gas water heater Troubleshoot electric water heater Point of use water heaters |
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