Before purchasing a new hot water system, consider what you would like to improve upon based on your old set-up. Traditional hot water systems will run on both gas and electricity. These types of hot water systems generally start at a 9L capacity, which is often enough for those who only use the hot water for doing the dishes, other cleaning and for washing hands, and increase from there.
Other options that can be considered are solar-powered units and hot water heaters that can be attached to the tap. Systems that heat water as it passes through the tap can save installing a large system and reduce the van’s overall weight.