Product review (5 stars): Works as advertised - couldn't be happier
We bought a set of these to use to control the pump for our home water heater -- works great, we have it installed in all our bathrooms.  Whenever anyone needs hot water, rather than waste water, we just turn on the hot water pump using the wireless transmitter, and a few seconds later we have hot water.  Turning it off after the warm water arrives has saved a lot of energy.