Hot water is the upgrade that makes a van feel like a house. These Pundmann Therm boilers are dual-input AC/DC units: they heat from 12V while you drive or from 110V shore power at a campground, so you are not tied to either one.

• 3L - hand washing and dishes; the space-efficient choice for a 144"
• 6L - a genuine short shower; the most common van size. Tower and horizontal cases available for different cabinets
• 9L - two showers back to back, or a family build
• 10L 4-in-1 - adds engine-coolant and forced-air heat, so a drive day makes hot water and warms the cabin free

Pair with a fresh water tank and a shower pan or folding shower. In winter builds, run it alongside a diesel or gasoline air heater.