The Complete Buyers Guide To Caravan Hot Water Systems

Hot water is one of those things you never think about until the shower runs cold on a frosty morning in the middle of nowhere. This guide covers how caravan hot water systems work, what to look for, and our top picks for 2026, from big fixed storage tanks to portable instant units and off-grid diesel setups.

What to Look For When Buying

A caravan hot water system is not a big decision on its own, but the wrong choice will annoy you every single day of the lap. The right one depends almost entirely on how you travel: powered sites versus free camping, a couple versus a family, and whether you already run diesel for heating. Here is what actually matters.

Fixed Gas & Electric Storage Systems

These are the built-in tanks that give you a real indoor shower. They store a set volume of hot water and reheat it as you use it. For most vans this is the system to have, and the multi-source models that run on both gas and 240V give you the best of both worlds.

1

Best Fixed

$949

Suburban SW6DEA

The big-tank all-rounder that showers a family without running cold

If you want one fixed system that just works for a family van, this is it. At 22.6L it is the largest common size, which means genuine back-to-back showers before it needs to recover. It runs on both gas and 240V, so you have free hot water on powered sites and full off-grid capability on gas. Direct spark ignition fires it up at the push of a button, and the glass-lined steel tank is the long-life benchmark in Australian vans. Gas recovery is around 35 minutes.

Capacity

22.6L

Energy

Gas + 240V

Recovery

~35 min (gas)

Tank

Glass-lined steel

✔ Pros

• Largest common tank, real back-to-back showers
• Gas and 240V, free on power and fine off-grid
• Long-life glass-lined steel tank
• Smaller SW4DEA (14L) sibling if space is tight

✗ Cons

• Heavy, and needs a large wall cut-out
• No 12V option (step up to the triple-source SW6DERA)
• Licensed gas install required

Our verdict: the default fixed system for families and anyone who hates the shower running cold halfway through.

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2

Premium

$1,250

Truma UltraRapid (14L)

Fastest recovery and European build, if you value speed over size

The UltraRapid trades tank size for speed. It holds 14L, less than the Suburban, but it reheats much faster: run gas and the 1,300 to 1,415W element together and you are back to a full tank in about 28 minutes. It is compact, it carries the Truma name for reliability and parts support, and the fast recovery means a smaller tank does not feel small in daily use. A good pick for a couple who want quality and do not need a 22L reservoir.

Capacity

14L

Energy

Gas + 240V

Recovery

~28 min (mixed)

Element

1,300 to 1,415W

✔ Pros

• Fastest recovery of the fixed tanks here
• Compact, easier to fit than a 22L unit
• Truma reliability and parts network
• Gas and 240V for on-power and off-grid

✗ Cons

• Premium price for a 14L tank
• No 12V option
• Licensed gas install required

Our verdict: buy it if fast recovery and build quality matter more to you than raw litres.

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3

Best 12V / 240V

~$399 to $425

Duoetto MK2 Digital Dual Voltage 10L

Gas-free hot water for vans that only have electricity to work with

If your van has no gas plumbed to it, the Duoetto is the clever answer. It runs on both 12V and 240V: trickle it off your battery and solar when you are free camping, or switch to 240V for fast heating when you are plugged in. A digital thermostat sets the temperature, the 10L tank suits a couple, and it is genuinely easy to plumb in yourself with no gas fitter involved. It mounts in various orientations to suit tight cupboards.

Capacity

10L

Energy

12V + 240V

Control

Digital thermostat

Install

DIY, no gas

✔ Pros

• No gas needed, DIY-friendly install
• 12V for off-grid, 240V for fast heating on power
• Digital thermostat and flexible mounting
• Well-priced against a fixed gas tank

✗ Cons

• 12V mode is slow and battery-hungry
• 10L is couple-sized, not for families

Our verdict: the best way to add hot water to a gas-free van without gambling on a slow 12V-only unit.

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4

Continuous Flow

~$599 to $699

Camec Digital Instantaneous Gas Water Heater

Endless hot water with no tank to reheat

A fixed unit that heats on demand rather than storing. Because there is no tank, you never wait for recovery and you never run out mid-shower. It is lighter than a storage system, runs on pure gas so it works fully off-grid, and the digital control lets you dial in a set temperature. The trade-off is the nature of instant heating: flow is limited, and it is sensitive to very cold source water in winter, when the output temperature can dip if you open the tap wide.

Type

Continuous flow

Energy

Gas only

Control

Digital temp

Off-grid

Yes

✔ Pros

• Never runs out, no recovery wait
• Lighter than a storage tank
• Pure gas, fully off-grid capable
• Digital temperature control

✗ Cons

• Gas only, no electric option
• Flow-limited and sensitive to cold winter water
• Licensed gas install required

Our verdict: a smart fixed choice for off-grid vans that want endless hot water and can live with limited flow.

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Portable Instant Gas Systems

These need no install and no cut-out. They hang off the back of the van, connect to a gas bottle and a 12V water pump, and heat water on demand as it flows through. They are cheap, flexible, and brilliant as a backup or as the entire hot water setup for a camper trailer or a simple van. The catch is that you shower outside, so they suit warm-climate travel and the sort of camper who does not mind a bush shower.

5

Best Portable

$399

Joolca HOTTAP v2

The enthusiast default, and for good reason

The HOTTAP is the portable unit the community keeps coming back to. It delivers continuous, on-demand hot water off a standard gas bottle, so you get a proper hot shower anywhere you can park. The huge following behind it is not marketing; it is well-built, it packs down, and it has become the benchmark portable system in Australia. If you want the best portable and are happy to shower off the back of the van, buy this one.

Type

Portable instant

Energy

Gas bottle

Output

Continuous flow

Install

None

✔ Pros

• Endless on-demand hot water anywhere
• No install, no cut-out, fully off-grid
• Proven, huge owner following and support
• Great backup for a fixed system, or the whole answer

✗ Cons

• You shower outside the van
• Needs a gas bottle and a 12V pump
• Dearer than the budget portables

Our verdict: the portable to buy if you want one that will not let you down and holds its value.

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6

Budget Pick

$179.95

KickAss Instant Camping Hot Water System 6L

Half the price of a HOTTAP, and it still gets you clean

The KickAss is the sensible budget portable. It does the same core job as the Joolca, heating water on demand off a gas bottle for a hot shower off the back of the van, at well under half the price. It will not have the same fit and finish or the same cult following, but for occasional use, as a backup, or for a first van on a tight budget, it is honest value. Rated at 6L/min flow.

Type

Portable instant

Energy

Gas bottle

Flow

6L/min

Install

None

✔ Pros

• Excellent value for an instant gas unit
• No install, fully off-grid
• Great backup or first-van option

✗ Cons

• Not the build or following of the Joolca
• You shower outside the van

Our verdict: the smart budget pick when you want portable hot water without spending HOTTAP money.

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7

Also Great

~$199

Gasmate WaterTech

The middle-ground portable from a familiar camping brand

The Gasmate WaterTech sits between the budget KickAss and the premium Joolca. It is a familiar name on the camping shelf, widely stocked, and does the standard portable job of on-demand gas hot water off the back of the van. If you want a known brand without paying HOTTAP prices, it is a solid also-ran that gets the job done.

Type

Portable instant

Energy

Gas bottle

Output

Continuous flow

Install

None

✔ Pros

• Familiar camping brand, widely stocked
• Good value on-demand hot water
• No install, fully off-grid

✗ Cons

• Doesn’t have the HOTTAP’s following
• You shower outside the van

Our verdict: a fine middle option if it is in stock and you want a name-brand portable without the premium.

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12V & Diesel Systems for Off Grid

For full-timers who live away from powered sites, the interesting options run without gas bottles at all. A true 12V heater works straight off your battery and solar, while a diesel system taps the same fuel you are already carrying. Diesel in particular is the premium off-grid answer, and if it also heats your cabin you are getting two jobs from one burner.

8

12V Specialist

$349.95

KickAss Aqueous 12V Water Heater 6L

Hot water with no gas and no mains, straight off the battery

This is the pick for a fully off-grid van running on solar and battery with no gas or mains at all. The Aqueous is a true 12V DC heater: a glass-lined, insulated 6L tank with a thermostat you can set from 30 to 75°C, plus run-dry, over-temperature and over-pressure protection and an IPX4 rating. Be clear-eyed about the trade-off, though. It draws 13.3A (180W) continuously and takes around two hours to heat 6L, so it is a slow trickle heater, not an instant one. Set it going well before you want a shower.

Capacity

6L

Energy

12V DC only

Draw

13.3A / 180W

Heat Time

~2 hr for 6L

✔ Pros

• True 12V, no gas or mains needed
• Glass-lined insulated tank, good safety cut-outs
• Adjustable thermostat 30 to 75°C
• Simple off-grid solution for a small van

✗ Cons

• Slow, around two hours to heat 6L
• 13.3A continuous is a real load on a modest bank
• Small tank and only a 12-month warranty

Our verdict: the honest choice for a gas-free off-grid van, as long as you plan ahead and have the battery to feed it.

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9

Best Diesel

$2,869

Truma Combi D6

Cabin heat and hot water from one diesel unit, no gas bottles

For serious full-time off-grid travellers, the Combi D6 is the benchmark. One unit delivers around 6kW of cabin heating plus roughly 10L of hot water, all off the van’s diesel tank, so there are no gas bottles to chase and you are burning fuel you already carry. You get Truma’s controls, reliability and dealer network behind it, which is why it is the integrated system fitted to so many premium Australian vans. It is expensive and the install is involved, with a diesel line, exhaust, ducting and 12V all to run, so budget for a professional fit. But if you want to solve heating and hot water in one hit for a life on the road, nothing else does it this cleanly.

Heat Output

~6kW

Hot Water

~10L

Energy

Diesel

Does

Air + water

✔ Pros

• Heats the cabin AND the water from one unit
• Runs off the van’s diesel, no gas bottles
• Most efficient off-grid setup for full-timers
• Truma reliability, controls and dealer support

✗ Cons

• Expensive up front
• Complex install, professional fit advised
• Overkill if you only need hot water

Our verdict: the best long-term off-grid answer, especially if you were going to fit a diesel heater anyway.

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Quick Comparison Table

Here is how the picks stack up side by side.

The Verdict

The right hot water system comes down to how you travel, not to which one has the best spec sheet. Sort out your situation first and the choice makes itself.

For most fixed vans, the Suburban SW6DEA is the one to buy. The 22.6L tank and dual gas plus 240V running mean it showers a family without complaint and works whether you are plugged in or free camping. If you value fast recovery and European build over sheer litres, the Truma UltraRapid is the upgrade, and if your van has no gas at all, the Duoetto MK2 gives you flexible 12V and 240V hot water you can install yourself.

If you would rather skip the install, or you want a backup, a portable is the answer. The Joolca HOTTAP v2 is the best of them and the one worth the extra money; the KickAss 6L does the same job for a first van on a budget. And for the serious full-time off-grid crowd, the Truma Combi D6 is in a league of its own, solving cabin heat and hot water from one diesel unit with no gas bottles to manage. If you were fitting a diesel heater anyway, it is the smart long-term play.