Electric hot water in a caravan works on the same principle as a household electric kettle: a 240V heating element immersed in a water tank heats the water directly. It’s simple, reliable, and silent. The catch is obvious: it only works when you’re connected to 240V mains power at a caravan park, or running a generator. Off-grid, it’s useless unless you have an inverter with enough battery capacity, which for most setups is impractical for hot water heating.
How It Works
A 240V element (typically 600W to 1,200W) heats water in a storage tank. A thermostat controls the element, switching it off when the water reaches temperature and on again when it cools. Heating time is slower than gas: a 10-litre tank takes 30 to 60 minutes from cold on electric alone. Once hot, the insulated tank maintains temperature for several hours.
Most caravan electric hot water is part of a dual-fuel system. The Suburban SW6DEA ($600 to $900) is the most common factory-fitted unit, with both a gas burner and a 240V element. The Truma UltraRapid ($800 to $1,200) offers faster electric heating. If your electric element fails, replacements are typically $30 to $60 for a Suburban element and are a straightforward DIY job.
When Electric Hot Water Makes Sense
At powered sites: Electric hot water is “free” (included in your site fee) and conserves your gas supply. If your system is dual-fuel (gas and electric), switch to electric when plugged in.
Overnight heating: Switch the electric element on before bed at a powered site and you’ll have hot water ready in the morning without touching your gas.
As a backup: In dual-fuel systems, electric provides a backup if your gas system has issues (blocked burner, empty bottles).
Limitations
No off-grid capability: 240V electric hot water doesn’t work when free camping (without a generator or very large inverter/battery system). This is the primary limitation for Big Lap travel.
Slower heating: Electric elements take roughly twice as long as gas to heat the same volume of water.
Power circuit sharing: A 1,200W hot water element draws about 5 amps from the 240V circuit. At caravan parks with 10-amp or 15-amp outlets, running the hot water element simultaneously with an air conditioner, kettle, or microwave can trip the circuit breaker.
If your system is dual-fuel, the best strategy is: electric at powered sites (save gas), gas off-grid (no power needed). Some systems can run both simultaneously for faster heating, which is useful when you arrive at a powered site and want hot water quickly.
- Electric hot water only works at powered sites or with a generator. Not viable off-grid.
- Slower than gas (30 to 60 minutes vs 20 to 30 minutes for a 10L tank) but conserves your gas supply.
- Use electric at powered sites, gas off-grid. Dual-fuel systems give you the best of both.
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