Question for you or @orton
-- how is this approach superior to using a Shurflo pump as an "on demand" pump (i.e. unpressurized system)?
Centrifugal solar pump advantages:
1. Pump is very quiet.
2. Space required is about 1/8 what a normal RV pump requires.
3. Water system is not pressurized so a leak does not empty tank into van.
4. The freshwater tank can be drained through the pump.
5. Pump not affected by debris.
Centrifugal solar pump disadvantages:
1. Must use switch to turn on pump to get water.
2. Pump must be located below freshwater tank. It is not self-priming. My pump is at back of slider step with tank over passenger side wheel well.
3. Discharge must have a tee so small amount of water returns to freshwater tank to keep quiet pump cool if you forget to turn it off.
Fresh Water | Orton Travel Transit (ortontransit.info)
For a shower I use a Sous Vide kitchen water heater in a 16-quart Igloo cooler. Use submersible 12 volt DC pump in cooler, a 10' hose and a radiator fill valve. Igloo cooler is normally my waste basket. Remove plastic garbage bag, add 2 1/2 gallons of water and 20 minutes later I have warm shower water that used about 13 amp-hrs of battery capacity. All cooler waste basket conversion parts fit in a HF plastic ammo can. Hose/nozzle are stored separately. Portable cooler and 12 volt power supply can be carried to where you want to shower.
Orton DIY Transit | Page 8 | Sprinter-Source.com