For long term camping I used 25' of 6" PVC pipe in a coil. Wanting it to heat faster I used Reynold's extra heavy aluminum foil beneath it. Have to be very careful about too high of heat. Used a standard 3.2 gal/min to push water in the far end. Rather than a flooder I used a pair of water saver nozzles angled 45 against each other and a spring loaded ball lever bronze valve and a chain for release. If the coil gets too hot throw a tarp over it.
All the gear was a PITA to manage so only the piping was loaded up after use. But I stayed in one spot for many months.
For the heavy sunshine shower bag use a DEER DRESSING rope and pulley set that fits in your pocket. Had four of them horse packing
