Looking for some kind of race shower setup. I want a hot water shower after remote rides. I have seen some on demand water heaters w 6 liter tanks.. that quantity of water just doesn't sound sufficient.. looked at RV sites and some YouTube but everything looks either expensive or complicated or both.. I could have 5 or ten gallons of water available in plastic cans but getting it under pressure to flow through a water heater is a different thing. I looked at a low volume transfer pump from Harbor freight.. but the van I am converting to a mobile training camp doesn't have all that much room..