When it comes to caravan hot water, having the right system in place can make or break your travel experience. Whether you’re free camping in the outback or pulling into a holiday park, being able to wash dishes or enjoy a hot shower at the end of a long day is a non-negotiable luxury for many travellers. But should you go for a Tank Hot Water System or an Instant Hot Water (also known as on-demand) system? Let’s explore the key differences so you can make the right choice for your caravan lifestyle.

The Traditional Tank Hot Water System

The tank-style hot water system is a familiar setup in many caravans. In the models we use, this is typically a 28-litre stainless steel tank that operates on gas, 240V electric power, or both. It takes around 28 minutes to heat water from cold using a single power source, and 20 minutes if both are running simultaneously.

Maintenance and Setup

One of the perks of the tank system is its low maintenance. Aside from clearing out cobwebs and any creepy-crawlies that have made a home during storage, it’s mostly set-and-forget. The stainless-steel construction also means it’s built to last with minimal upkeep.

Operation Tips

If you’re off-grid, simply turn on your pump, run the hot tap to purge air from the system (a good excuse to wash those dusty hands), then switch on either the gas or 240V heating. If you’re at a caravan park, you might prefer to stick to 240V only.

Keep in mind though, this system is a 28-litre tank and most caravan showers run at around 5 litres per minute. That gives you just under six minutes of hot water – enough for a quick rinse, shampoo, and rinse again, but not a long, leisurely soak. It’s ideal for couples or small families who plan short showers and are mindful of their water usage.

The On-Demand (Instant) Hot Water System

Instant hot water systems are increasingly popular for modern caravans, especially among travellers who don’t want to wait half an hour for their water to heat up. These units ignite when the hot tap is turned on and heat the water as it flows through the system.

Efficiency and Convenience

This type of caravan hot water system doesn’t rely on stored hot water. That means you’re not wasting power or gas keeping a tank heated throughout the day – hot water is available nearly instantly. However, it’s important to understand that “instant” doesn’t mean there’s zero wait. Water still needs to pass through the heat exchanger, and there can be a short delay between turning the tap and receiving hot water at the showerhead.

The key advantage is no run-out – you’ll have continuous hot water for as long as your gas and water supply last. The trade-off is that it’s gas-only, so if you’re relying on electric hookups at a caravan park, this system won’t work unless your gas is turned on.

Water Usage Considerations

Instant systems can tempt travellers to linger in the shower. But remember, water is a finite resource when you’re off-grid. At 5 litres per minute, a 200-litre water tank could be drained in just 40 minutes of continuous use. Conscious usage remains important even with a high-tech hot water setup.

Choosing the Right System for Your Setup

When selecting or building your caravan, here are some key questions to ask:

• How do you travel? If you frequent caravan parks with access to 240V, a tank system offers flexibility with gas and electric heating.
• Are you often off-grid? Instant systems are excellent for free campers – quick heat-up, no standby energy use, and only gas required.
• How many people use the van? Larger families may find the continuous flow of an instant system more convenient, while couples might prefer the simplicity of a tank.
• Do you like long showers? Tank systems force you to be efficient, while instant systems can encourage overuse if you’re not careful with water storage.
• Do you want to avoid surprises? With tank systems, it’s easier to predict when you’ll run out of hot water. Instant systems require you to monitor water more closely.

It’s also worth thinking about where the system is installed. Mounting an instant hot water system closer to the bathroom can reduce heat loss and shorten warm-up times at the tap.

Final Thoughts: Tailoring Hot Water to Your Travel Style

Whether you go with a traditional tank or a modern instant unit, choosing the right caravan hot water system comes down to how you travel, how much water you use, and what comforts you can’t live without.

While on-demand systems are popular for their efficiency and convenience, tank systems still have their place – especially when powered by both gas and 240V. Each has its pros and cons, but understanding these will help you make the best choice for your van and lifestyle.

Still unsure? Come have a chat with us at Adelaide RV. We’ll walk you through the options and help you build a caravan that’s truly Adventure Ready – including the perfect hot water setup.