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.
Water savings are hard to calculate because of so many influencing factors. A 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.
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.
DHW recirculation 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.
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.
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.
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.
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.
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.
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.
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