Recirculation pumps are available with permanent split capacitor (PSC) motors, electronically commutated motors (ECMs) with electronic controls, and permanent magnet Vortex pumps.

The cost of the electricity at $0.12 per kW for the small pump for 250 feet of pipe on a timer for eight hours a day with a sensor and switch that runs on average 3 minutes per hour and costs $1.40 to $1.59 a year in electricity. The .79-A circulator uses 90 W and costs $4.73 a year.

Water savings are hard to calculate because of so many influencing factors. A U.S. government study estimates water savings of up to 12,000 gallons for four points of hot water use and up to 15,000 gallons for five points of use per year. The savings also depend on the size of the pipes (1/2-inch, ¾-inch or 1-inch copper or PEX), total length of pipe from the heater to the furthest sink, size of the pump and efficiency of the system.

TL4000N   &     TL5000N COLD LINE AS RETURN TANK OR TANKLESS W.HTRS HEATER* OR SINK INSTALL SAME 4-HOSE 3-STEP => CONNECT 4 HOSES 2 HW LEFT / 2 CW RIGHT 6¾"H X 13½"W X 7"D * 0.79 AMPS 1/25TH HP * 16' HEAD 1 - 14 GPM IDEAL ALL-IN-ONE SYSTEM FULL SPEC'S IN BROCHURE  CLICK TO READ MORE

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Hot water recirculating systemwith dedicated return line

Installing a ReadyTemp® guarantees the most efficient control of your home’s hot water performance.  No other product on the market provides better comfort, more control, or improved efficiency.  With energy-saving features including "temperature based" cyclic pumping, adjustable temperature control, and scheduled-off "single-cycle" override, it's easy to see why ReadyTemp® is the industry’s "homeowner preferred" hot water circulation pump.

The selection of the correct hardware, controls and pump are important for long service life. Payback depends on the cost of the monthly water utility bill, electricity cost per kW, how many users are in a home, and initial installation cost, though it is typically between 1 and 3 years.

ReadyTemp®'s Intelli-Circ Controller, Precise Adjustable-Temperature and Silent-Solenoid solves major inefficiencies and inconveniences common in today's hot water circulators and retrofit hot water circulating pumps

Big operating cost savings are achieved by not running the recirculation system 24 hours and only running it when hot water is needed at the sink. This is achieved by limiting the operating time with a mechanical or digital timer.

If there is a power outlet under the sink farthest from the heat source in a one-pipe system, the simplest method is to install a kit with pump, timer, two hoses, two tees, and check valves under the sink. Hooking it up takes 10-15 minutes with only a wrench required — no cutting of pipe is needed for systems with up to 250 feet of pipe. Tankless systems may require larger pumps due to minimum flow rates required by the heater.

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Because the power consumption is so small, the best selection is the PSC pump because it is more durable, stronger, less complicated and easier to service.

Homes built before 1980 usually use a one-pipe system. This means one hot-water pipe feeds every sink, and it stops at the last sink in the home. A dedicated return line system uses a return pipe from the last sink back to the hot-water tank or tankless heater. The homeowner needs to know if he or she has a hot-water tank or a tankless system, and a one-pipe or dedicated return line, in order to select the correct recirculation components.

Selecting the right components will yield savings, provide hot-water comfort and help reduce the water shortage for as long as the user lives in the home.

TL4000N  $489.00   No Dedicated return line / Cold line as return (Adj Flow 1 to 14 GPM,16 ft head, 1/25hp) TACO 008

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How does ahot water recirculating systemwork

Electronic controls also are available for this function. The controls log the time of hot-water usage and start the pumps based on user history. A simple mechanical timer is easier for a plumber to service and can be less costly and more reliable than electronic timers, which have many more parts. Insulating the hot-water supply pipes or using heat tapes keeps the water hot longer and saves on water-heating costs.

TL4000D    &       TL5000D  with DEDICATED RETURN TANK OR TANKLESS W.HTRS MOST ANYWHERE ON LOOP     * YLW =TL4'S  *BLK =TL5'S CONNECT SUPPLY / RETURN CONFIG'S TO "ANY" LIFESTYLE 6¾"H X 10"W X 7"D * 1.76 AMPS 1/8TH HP * 30' HEAD 1 - 28 GPM WITH ½" OR ¾" FLANGES        FULL SPEC'S IN BROCHURE        CLICK TO READ MORE

Title 24 of the California Code of Regulations now mandates hot-water recirculation in California building codes if the distance from the heat source to the tap is 50 feet or more. Other states have their own building codes that often vary by county.

If there is no power under the sink in a one-pipe system, install the pump on the hot outlet of the water heater. Pumps are equipped with a mechanical timer and line cord. Under the sink farthest from the heater, a plastic thermostatic bypass valve transfers tempered water to the cold-water line. A new stainless/bronze valve is available that has larger water-flow orifices and does not need screens, which can plug up with calcium in areas with hard water.

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. 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. This process saves water, utility costs, and energy and sewer expenses. It also helps reduce the fresh water shortage.

Hans Kuster is an entrepreneur and inventor with 50 years of experience in the hydronics industry. He is the founder and president of AquaMotion and Sparco, and has received 25 patents between the two companies. Sparco was sold to Honeywell in 2000. Both the pumps and valves are patented, U.S. built and 100% tested at the Rhode Island factory. The AquaMotion Aqua-Flash under-sink hot-water recirculation system is the winner of the AHR/EXPO 2018 Innovation Award for the most innovative plumbing product. For more information, please visit www.aquamotionhvac.com.

Hot water recirculatingpump installation diagram

Optimizer Control Box,  Built-in check valve, two (2) isolation valves 1/2" or 3/4" female connections, Temperature probe

Have tank water heater and desire scheduled/timer+On-demand (push-button/wireless) lifestyle.  Order our TL4000 system.

Other hot water circulators repeatedly place costly demand on home water heaters during everyday "cold water events" i.e. toilet flushing, etc

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A PSC pump for recirculation uses .26 A (30 W) to .45 A (53 W) and can handle about 250 feet of pipe. The larger efficient circulators are good for 600 feet of pipe and use .79 A on speed three (90 W/hour). This pump works with under-sink systems with large hot-water tanks and tankless heaters.

ReadyTemp®'s temperature-based cyclic system pumps water that is lower than the homeowner’s selected temperature out of the hot water line, into the cold water line, and then back into the water heater.  This cyclic-pumping consumes less energy compared to top-mounted hot water recirculators which pump continuously during scheduled-on periods.  Cyclic pumping benefits comfort as well by providing a home’s cold water pipes the seconds needed to absorb the warmer water that has been passed from the hot water line.  As a result, the homeowner does not waste water, time and energy waiting for cold water, a frequent complaint by owners of other hot water circulation pumps.   ReadyTemp®'s normally closed solenoid valve provides unsurpassed comfort in that it's not vulnerable to pressure fluctuations during cold water use, unlike inferior thermostatic valve and spring-based check valve designs that cannot prevent siphoning from the hot water line during cold water usage.

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Inadequate flow of low-power circulators or thermostatic valve systems with uninsulated pipes/pipes in foundation/cold seasons

ReadyTemp® monitors temperature using a "precision grade" stainless steel "water contacting" temperature probe. It consistently and accurately measures temperature, cycling the internal TACO pump, only as needed, maintaining water at the homeowners dialed-in temperature.  ReadyTemp®'s unique space-industry engineered manifold achieves ‘positive bypass flow restriction’ using an integrated ‘normally closed’ solenoid valve for industry-record efficiency and savings.  This more efficient bypass valve prevents any water from siphoning out of the hot water line and into the cold water line during the homeowner’s use of cold water inside or outside of the home.  Inefficient ‘normally open’ thermostatic bypass/comfort valves remain open any time 95F or hotter water is not present in the line resulting in repeated, unnecessary and expensive demand on the water heater. This costly, inefficient siphoning occurs as a result of the imbalance in water pressures between the hot and cold water lines during cold water use. Higher pressure in the hot water line forces water into the cold line, even during the use of cold water only. This siphoned water is then replaced by cold city water entering the home’s water heater. With Inefficient hot water recirculators, every instance of cold water use, whether at the kitchen tap, the bathroom toilet, or the garden hose, results in extra demand on the water heater.

ReadyTemp® delivers the very best in hot water comfort, convenience and savings by eliminating numerous costly, comfort robbing  inefficiencies found in today's circulators, recirculators and on-demand systems. The inability to control both hot and cold water comfort, the inefficiency of continuous running pumps, the inaccuracies from pipe clamp-on temperature sensors and the costly waste of energy from repeated siphoning water from the hot water line to name a few.   Our philosophy, the sooner hot water is received at your desired temperature, the sooner very cold city water stops filling your water heater--water that would go down the drain, wasted.  ReadyTemp®'s temperature dial provides homeowners the means to control and optimize their home’s hot water convenience and comfort for maximum efficiency and savings.

ATC3000 OPTIMIZER ATC3000 TANK WATER HEATER UNDER SINK INSTALL EASY 3-STEP INSTALL CONNECT 4 HOSES 2 HW HOSE / 2 CW HOSES 6"H X 7"W X 7"D 0.52 AMPS 1/40TH HP MAX 125' TO W.HEATER IDEAL SCHEDULED/TIMER        FULL SPEC'S IN BROCHURE           CLICK TO READ MORE

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If there is a power outlet under the sink farthest from the heat source in a one-pipe system, the simplest method is to install a kit with pump, timer, two hoses, two tees, and check valves under the sink. Photo credit: AquaMotion

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Mechanical timers usually have three positions: on, off, and on timer. The on-timer tab, with 15-minute run time on the 24-hour clock, can be set to achieve maximum savings. Photo credit: AquaMotion

Anti-siphon solenoid, 2 isolation valves, Power cord, two (2) Flex lines, 20 event Timer, Install Guide, 2 yr warranty

TL5000N  $639.00   No Dedicated return line / Cold line as return (Adj Flow 2 to 30 GPM, 31 ft head, 1/8hp) TACO 011

Have tankless water heater and prefer scheduled / timer and/or On-demand (push-button / wireless) circulation operations.

Because a recirculation pump with built-in controls runs only 3-4 minutes per hour, it is wise to stay with the simplest PSC-driven motor. ECM motors require an electronic control with many more parts; they may not be as durable and reliable as the PSC pumps and can cost more.

The all-bronze Aqua-Flash bypass recirculation valve installs under the sink in minutes and does not require electricity or batteries. Photo credit: AquaMotion

TL5000D  $585.00   Dedicated return line (Adj Flow 2 to 30 GPM, 31 ft head, 1/8hp) TACO 011 Stainless Steel Pump

TL4000D  $435.00   Dedicated return line (Adj Flow 1 to 14 GPM,16 ft head, 1/25hp) TACO 008 Stainless Steel Pump,

CHOOSE:  TL4000(N or D) N=No dedicated return line (will use cold line as return)  D=Dedicated return line already exist in home

Recirculating hot water systemdiagram

Anti-siphon solenoid, 2 isolation valves, Power cord, two (2) Flex lines, 20 event Timer, Install Guide, 2 yr warranty

Tankless water heating systems may require larger pumps due to minimum flow rates required by the heater. Photo credit: AquaMotion

Recirculating hot water systemretrofit

Pump selection is critical. Choose designs with a large inlet/outlet to prevent calcium deposits at the connections and premature failure. A stainless pump with a replaceable stainless cartridge and rotor sleeve will provide long service in hard water areas. One is available with a flushable cartridge to double the life of the pump without having to pay for a brand-new stainless pump. Selecting a U.S.-built pump system allows for technical support and parts availability.

Industry record efficiency; intelli-Circ on-board microcontroller, cyclic-pumping, anti-siphon solenoid prevents costly HW demand

Tankless heaters or tankless combi-heaters require flow of 0.5 to 1.1 gpm to turn on the heater when the temperature setting is reached. The bypass plastic valves currently available have limited flow rates of less than 0.5 gpm and cannot perform with most tankless heaters.

Hot water recirculatingpump

Recirculation systems advance the flow of hot water from your boiler or water heater through your home and back to the heat source.

Mechanical timers usually have three positions: on, off and on timer. The on-timer tab, with 15-minute run time on the 24-hour clock, can be set to achieve maximum savings. Many prefer the mechanical timer rather than the programmable electronic timer because it is easier to set. These timers are built into the pump or separate plug-ins can be used.

Optimizer Control Box,  Built-in check valve, two (2) isolation valves 1/2" or 3/4" female connections, Temperature probe

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