A 12V DC Water Heater’s tank holds six liters (or 1.6 gallons) of hot water. The heater increases warm water up to two-to three times through the addition of hot and cold water. This heater uses advanced anti-corrosion technology and is enamel coated. It is also battery and shore power compatible, so you can drive with it while it’s working. Here are some of the benefits of this heater.