Metlund’s product, uses your existing water pipes and requires the pump and valve to operate together under the sink (which creates a secondary requirement for electricity under the sink where there is not usually an outlet). In addition, it requires the user to activate it to call for water – in residential applications this will typically be a pushbutton. The system may save water but doesn’t provide instant hot water and is difficult to install (requiring electrical connections). The pump life is estimated at 2-years.
Laing’s product uses a similar concept – creating a recirculation loop using existing hot and cold water pipes and a pump. Laing’s pump turns on automatically whenever the hot water cools below a pre-set, non-adjustable temperature. The pump is also located under the sink (which creates the requirement for electricity under the sink where there is not usually an outlet). The system may save water but doesn’t allow the consumer to adjust the temperature to meet specific needs and is difficult to install (requiring electrical connections). The pump life is also estimated at 2-years.
Grundfos’ product also uses a similar concept, using your existing water lines, a bypass valve and pump (located at your water heater) with a timer to control water flow. The bypass valve has a pre-set, non-adjustable temperature setting (which also doesn’t allow the consumer to adjust the temperature to meet specific needs). Grundfos’ product will not provide instant hot water other than when the pump is running and is difficult to install (requiring electrical connections and pipe cutting and soldering at your water heater).
The Hot Water Lobster Instant Hot Water Valve uses an innovative and patented method of hot water recirculation. 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) which can also prevent pipe freezing. This system has a temperature-controlled valve that allows the consumer to easily adjust the temperature control knob to meet their particular needs. There is no water waste with this type of system, and it also minimizes energy waste since it only re-circulates water when the hot water at your faucet cools below your desired temperature. Installation is a simple D.I.Y., 15-minute project (not requiring any pipe cutting, soldering or electrical connections). The Hot Water Lobster Instant Hot Water Valve also has a 10-year warranty.