I'm attempting to build a recirculating shower. I envision it like this: a bather will take a soapy, cleaning shower of 2-10 minutes to clean themselves, then take a potentially longer hydrotherapy shower with clean recirculating water.
Attachment 47968
After the cleaning shower the bather will remotely (via cable) close a drain valve. When enough water backs up to the top of the drain, water sensors 1 & 2 will detect that and activate the pump. The pump will push water through the heater and up to the shower head. If the temperature sensor detects that the water is not warm enough it will activate the heater.
When the bather hears the pump turn on he will turn off the water from the shower mixer, the shower's original water source.
When the bather is done with the hydrotherapy he will open the valve. When water sensor 2 detects no water it will shut off the pump and heater, which is piggybacked on the pump circuit.
I've listed most components on an Amazon list. It shows two alternatives for the pump and strainer: a separate pump and strainer, and one that is combined. The list excludes the 3/4" or 1/2" brass tee and possible check valves that connect the recirculating system to the original shower pipe.
I'd like to hear your feedback on the feasibility of this and if you have suggestions for better components, configuration, etc.