The benefits of hot water recirculation are rather obvious. You get nearly instant hot water, which is convenient, and you save a substantial amount of water.
There are a number of types of recirculation systems for residential plumbing. There are the traditional full-time circulating systems that continuously pump a small flow of hot water through the piping from the heater to the fixtures and back to the inlet of the heater. This type of recirculation system is wasteful of energy (running continuously). And remember that any system which requires electricity to operate makes installation a lot more complicated.
There are ways to reduce the energy loss such as putting the pump on a timer to reduce the number of hours it runs. The downside to this is that if you want hot water when the system is off, you will still have to wait for hot water and you will still run a lot of water down the drain.
Several manufacturers offer a pushbutton to operate the pump (also known as “Demand” systems) which do save water, but you still have to wait for hot water (and installation is quite difficult requiring not only electricity to operate, they often require wiring a pushbutton at each location instant hot water is desired).the recirculating loop.
The best of all worlds is a new innovative and patented technology known as a “temperature controlled hot water recirculating valve”. It uses your existing water pipes and the thermal convection generated by your water heater to circulate the water back to your water heater for reheating (not requiring a pump or any electricity). These systems have a temperature-controlled valve that allows the consumer to easily adjust the temperature to meet their particular needs. There is no water waste as it reduces the energy required to heat your water while it provides instant hot water to your faucets and showers. Installation is a simple DIY project (no pipe cutting, soldering or electrical connections).