Hot water recirculatingpump without return line

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Split pump and bypass valve kit. Pump at water heater and valve under sink. For single pipe plumbing with a TANKLESS water heater. ON DEMAND.

Hot water recirculatingpump installation diagram

Expansion tanks are required in heating, cooling or air condition system to avoid unacceptable increases of system pressures when water expands during heat-up.

Hot water recirculating systemwith dedicated return line

How does ahot water recirculatingpump work

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AHM3K-R SHOWN ABOVE WITH A TIMER.  AMH3K-RN HAS NO TIMER AND MUST BE PAIRED WITH ON-DEMAND ACTIVATION BUTTONS AND ACCESSORIES (SEE BELOW).

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The AMH3K-RN is an on-demand version of the AMH3K-R model system and does NOT have a timer. On-demand gives you the ability to control system activation through a switch or motion sensor. When activated, the pump shuts off after 5 minutes or when the water temperature reaches 105 F.  Additional on-demand switches, motion sensors, etc (AMK- parts below) have to be purchased to activate the pump.

Recirculating hot water systemdiagram

Note that in an open expansion tank fresh air is constantly absorbed in the water and tends to corrode the system. Open expansion tanks must also be located above the highest heating element, in general on the top of buildings, where they may be exposed to freezing.

Split pump and bypass valve kit. Pump installs at water heater and valve under sink. For single pipe systems with a TANKLESS water heater with no pump. With timer.

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The AquaMotion AMH3K-R kit is designed for standard plumbing systems with hot water pipe length up to 600 ft. Use for large tank systems or TANKLESS water heaters. The kit requires an electrical outlet at the sink. Includes: stainless three speed circulator, built-in timer, line cord, check valves, aquastat/switch, MNPT companion flanges, 2 hoses and 2 tees. Full automatic control by the aquastat and timer.