Spouse give you grief about Navy Showers on the road? Want that 1/2 hour long hot shower after the a day of fishing but only have a 30 gallon grey water tank? Here’s your answer:
It’s a self contained device, about 5 gallons as a guess, with 2 circulating pumps, a heat exchanger, and two filters. Feed in (recirculated) hot water (from your propane heater, solar heater, engine coolant) to keep the shower hot; then it recirculates 1/2 gallon of shower water, polishing it in the filters on each pass, and keeping the temperature Just Right. Shower for an hour on 1/2 gallon. (Then use it for washing the dog, the camper, putting out the camp fire, whatever….). Cost of parts about $400 per the maker.
I also note it starts out with pointing at the “mini-split” AC/Heater mounted on the back of his Class C and just how very quiet it is. One of my concerns about getting an RV is that I HATE loud AC noise when trying to sleep (and where “loud” is anything I can hear ;-) so that alone is a “game changer” for me.
Between those two things, it fixes the two biggest Grumbles per RVs for spouse (she of the 90 gallon shower) and me (quiet sleeping please).
The “money shot” comes a ways into it where for a few seconds he has the cover off an you can see the insides of it. The valve on the side is a ‘temperature mixing valve’ and keeps your water temp constant to within 1/10 degree (per the video). One pump circulates water from your heat source to keep the temperature right (and, since it does circulate, no water is consumed from your fresh water tank…) and the other circulates the shower water through the filters and shower (so you use 1/2 gallon for your shower, however long you use it).
He has a miniature demo shower set up next to his coach to show folks. Full sized re-circulation rig, but the shower curtain and pan are small enough nobody is tempted to poach a shower off his demo ;-) Connects to 12 VDC with the small black wire, and to the water heater via the two plastic hoses / connections on coach. The sump depth is between 1/8 inch and 1/2 inch. That’s ALL it needs to run.
One interesting note came at the very end. He uses Epsom Salt to chelate the soap so the filter can remove it. So, OK, no “detergent bars”, just regular soap. Got it.