You can run it off batteries sparingly but it does draw quite a bit of power.
12v water tank heater.
We opted for a 12 volt system that heats while driving or on shore power.
This avoided the complexity and cost of a coolant heated version.
4 5 out of 5 stars 1 664.
12v water tank heater tubular heater description.
Bosch electric mini tank water heater tronic 3000 t 4 gallon es4 eliminate time for hot water shelf wall or floor mounted.
It can be used to heat still or flowing air water oil nitrate alkali and other kinds of liquid.
Diesel air heater 12v heater 5kw 10l tank lcd thermostat monitor with control silencer remote control diesel heater for trucks boat touring car bus 4 0 out of 5 stars 83 169 99 169.
Facon 12 x 18 rv tank heater pad up to 50 gallons fresh water grey water black water holding tank heating pad with automatic thermostat control 12v dc pack of 2 4 5 out of 5 stars 47 60 99 ultraheat 3 gang system kit switch package with lighted switches 13 5 vdc.
The version we built uses about 35 amps while the element is going.