I am a full time, only when the need arises, do it yourselfer. My mother's home has the hot water tank at one end of the house, the two bathrooms at the other end. I'm not too jazzed with a pump at the tank a thermal switch and bypass valves at the sinks. I don't like the idea of paying to keep that run of pipe hot all the time. I'd rather install a pump at the sink, a momentary switch that would run it for a (adjustable/preset) length of time, drawing on the hot and pushing back the cold side. If anyone can share some advice, I need some help on the hardware side. Type of pump, and how to run it for a preset length of time. Thank you for any advice.