Domestic Hot Water Return System

The role of the recirculation pump.

Domestic hot water return system. Typically for systems where the distance from the hot water heater to the consumption fixtures exceeds 25 30 m. Installation of hot water return piping. Essentially domestic hot water return piping is the modern response to this problem. When water moves through the hot water piping system it loses heat to the space through the insulation or pipe wall if no insulation.

High water velocities combined with hot water can cause velocity erosion issues for the pipe and valve walls. By turning off the recirc pump the hot water stays in the water heater which is much more efficient at keeping heat. Return pipes and a re circulation pump. In a traditional hot water recirculating system there is a dedicated return line for the hot water pipes which runs from the furthest bathroom or fixture back to the water heater.

1 us gpm 0 0630 liter sec. Comfort when you need it. Firstly why are you installing it. Domestic hot water recirculation part 4.

Recirculation without a return line. From there a small return is piped to the water heater. A return circulation pipe is sometimes provided in a hot water system where it is desirable to have hot water available continuously at the fixtures. As hot water moves through your house your it cools off and needs to be reheated.

That means 97 of the time you could be saving energy. The pumps are normally small factional horsepower constant speed pumps. Near the water heater area a recirculating pump pulls the water from the furthest fixture back into the water heater creating a loop. Maintaining temperature control in systems with steam instantaneous water heaters.

The warmed water leaving the heat exchanger and the building load return water are piped back to the return main line. Using a hot water recirculation pump eliminates instantly this expensive and annoying wait. A domestic hot water return system is installed in order to keep hot water readily available in all hot water faucets. In this case the only water stream mixing is done at the main line near the control station node.

At the end of each hot water plumbing supply the engineer adds a manual combination balance and flow measurement valve. The minimum pipe size i use for the hot water return system piping is inch pipe. The whole idea of a recirc system is to provide hot water quickly to the person at the fixture. The cold water makeup is introduced back at the main loop system near the hot water heaters.

The grundfos comfort pm autoadapt provides access to instantly hot water efficiently reduces the annual waste of domestic water and reduces the power consumption too. Studies show that hot water is used less than 3 of the time. The traditional domestic water recirculation system goes back in time a long way. Domestic hot water recirculation part 5.

Domestic hot water recirculation part 3. There are three things to consider before undertaking any new installation project. Water flow velocity is very important in domestic hot water pipes with copper piping and brass or copper alloy valves.