This union is made from galvanized steel and lead-free brass. Plumbing codes in all states require the use of dielectric unions when connecting dissimilar ...

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

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.

How does ahot water recirculating systemwork

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.

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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.

Features:– Reduces CO2 in two stages for more stable, reliable flow and to avoid end-of-tank dumps– Fits standard cylinder tanks that have the male thread size CGA320 (not intended for use with paintball tanks)– Uses a power adaptor with 100-240 VAC input and 12 VDC output– Includes an electronic solenoid that can be used with a timer to schedule the CO2 dosing– Comes with a bubble counter and integrated check valve– Expands with optional manifold block add-ons to run up to 6 aquariums– Works with standard CO2 diffusers operating at approximately 40–50 psi

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.

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

Recirculating hot water systemretrofit

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.

20221227 — A check valve allows flow in one direction and automatically prevents back flow (reverse flow) when fluid in the line reverses direction.

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.

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CO2 Scheduling: Plug the regulator into a Wi-Fi timer and program the timer to turn on 1–2 hours before the light comes on and turn off 1 hour before the light shuts off. (If you only have one timer, you can use the same timer with a power strip so that the light and regulator turn on and off at the same time.)

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.

Multiple manifold blocks can be added to this regulator to expand your CO2 system to multiple aquariums at once. Each manifold block features its own bubble counter for precise adjustment of gas to each aquarium individually.

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.

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

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.

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.

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Hot water recirculatingpump installation diagram

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.

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.

Hot water recirculatingpump

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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.

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.

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.

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.

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.

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

Water hammer arrestors are used to absorb the shock when water flowing in a piping system suddenly stops due to fast closing shutoff valves, dishwashers, ...

Recirculating hot water systemdiagram

Grow aquatic plants faster by injecting pressurized carbon dioxide in your planted aquarium. Using the Aquarium Co-Op CO2 regulator will ensure a steady and reliable release of CO2 gas as it features a dual stage design. The two easy-to-read gauges show both tank volume and working pressure. Included is a bubble counter for easy adjustments of CO2 levels as well as a solenoid valve which can be plugged into a timer for precise timing of CO2 release.

Hot water recirculating systemwith dedicated return line

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

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20231211 — A water backflow prevention device is a device that works to protect potable water from contamination or pollution due to backflow. In layman's ...

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.