>>97608720-30l water tank made of 1mm steel is mounted instead of right rear seat. Rear heater pipeline from front right seat is extended to the tank and entered in it by a copper coil. The tank has 10mm fiting to connect the pipe to the pedal shower like this
https://www.youtube.com/watch?v=2AJ8bM87Kj4 it consists of two valves operate by foot pressure. The engine heats coolant in cooling system and thus heats the water. Engine temperature is about 85 C, it is enough for heating the water so it takes required to mix with a little bit of cold water before using for comfort temperature. I thought to use aliexrpess 12v 60wt pump to make a pressure but it'd more expencieve and very more complicated. I prefer the simplest solutions though without any electricity, kek. The tank could be filled from anything - from a pipe, from a jerrican, from a bucket.
Certainly, the system can work only on started and warmed up to operating temperature engine, but in this case I have also Webasto heater that I can use for warming the coolant when engine is off. But I usually collect the water out of the place where I'm going to have a shower so during the ride to there the water will be warmed up.
These are just my sketches without a strict calculation, the system is still in the process of assembling and I really don't know whether this will work, but I hope it will.
