The best 12V water heater for a camper van is one that fits your battery bank and your shower habit, not simply the largest tank you can squeeze under the bed. Most of the 12V-rated heaters on the market today power a control board, fan and igniter from 12 volts while propane does the actual heating, and the one genuinely electric 12V model in this group heats a small stainless tank slowly and cheaply. I spent six weeks working through ten of the most-reviewed heaters for van and RV builds, comparing element wattage, burner output, flow rate, cutout dimensions and installed size to find the ones that fit real cabinetry.
That distinction matters more than the marketing suggests. A 12V DC connection on a tankless propane heater means the fan and sensors run on your leisure battery. It does not mean the water is heated by electricity, and it does not mean the heater will keep running with your engine off and the solar folded away. Only the FVSTR FS24RV in this roundup heats water from a 12V element at 200W, and its tankless propane competitors heat in seconds at 60000 to 80000 BTU. Both approaches have a place in a van, and this guide lays out which is which so you buy the right one.
We also ran the numbers builders actually argue about on forums: what a 200W element costs you in watt-hours, how that divides into amp-hours, and what fuse and cable that demands. If you are still planning the electric side of your build, our 12V water pump guide covers the pressure side of the same system, and our 12V air conditioner roundup handles the other big current draw that competes for the same bank.
Top 3 Picks for Best 12V Water Heaters for Camper Vans in 2026
CAMPLUX AY132 Portable…
- Complete kit with 12V pump and 25ft plus cables
- 34000 BTU burner
- 1.32 GPM flow
- Draws from a lake bucket or van tank
FOGATTI InstaShower 8 Plus
- 55000 BTU propane burner
- 2.9 GPM flow
- High-altitude ready to 9800 ft
- 15x15 door and remote included
Ranein RA65EH 65000 BTU
- 65000 BTU burner
- 3.9 GPM flow
- Oxygen-free copper heat exchanger
- Remote reports gas voltage and flow
Every Water Heater in This Test Side by Side in October
Ten heaters, sorted by how they heat water. Read the power source column first: one model in this table heats from a 12V element, the rest burn propane.
| Product | Specs | Action |
|---|---|---|
| CAMPLUX AY132 Portable Propane Shower |
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Check Latest Price |
| FOGATTI InstaShower 8 Plus |
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Check Latest Price |
| Ranein RA65EH 65000 BTU |
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Check Latest Price |
 Suburban SW6DEL 6-Gallon |
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Check Latest Price |
 RVPart Pro GT60 60000 BTU |
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Check Latest Price |
 APUS AP-AWH-RV12B 80000 BTU |
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Check Latest Price |
 Orbek HRU-RG060 60000 BTU |
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Check Latest Price |
 Poukaran 65000 BTU |
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Check Latest Price |
 CAMMOO RV-65000W |
|
Check Latest Price |
 FVSTR FS24RV 10L Dual Power |
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Check Latest Price |
1. CAMPLUX AY132 Portable Propane Shower — Best All-Round 12V Kit
CAMPLUX Portable Propane Water Heater & Pump Kit, 1.32 GPM Tankless Gas Shower System with 12V Pump, Long Power Cables & Extension Hoses, Instant Hot Water for Off-Grid Camping, RV, AY132P43, White
34000 BTU burner
1.32 GPM flow
10 lb weight
Kit includes 12V pump hoses and regulator
Pros
- All-in-one kit with 12V pump hoses and power cables included
- Heats instantly with no AC mains power needed
- Quick-connect fittings get you set up in about 10 minutes
- Easy-access battery compartment for D cell changes
Cons
- Some igniter and relay failures reported on newer units
- Temperature dial runs hotter than expected on the highest setting
- No cold-water bypass switch to stop the burner for rinsing
This is the unit I recommend first to anyone starting a build, because it removes every hard decision. There is no cutout to cut, no drain line, no anode and no flue. You hang it, run the included 12V pump into a bucket or a lake, and connect the gas regulator.
The numbers are modest next to a built-in tankless unit: 34000 BTU and 1.32 GPM, with a maximum temperature of 167 F. It will fill a bucket and warm it quickly rather than running two taps at once, which is exactly what a campground shower needs.
Everything you need is in the box. That includes the AY132 heater, a 12V water pump, a 5 ft CSA gas regulator, a 5 ft shower head, two 6.5 ft extension hoses, a 22.3 ft cigarette lighter cable and a 3.6 ft alligator clip cable, so you can run the pump from a socket or straight off a battery terminal.
The body is compact too. At 4.33 inches wide by 14.8 inches high and 10 lb, it stows in a rear locker or hangs from a tree strap, and the alloy steel and copper construction keeps the weight manageable for a portable rig.
Why it suits weekend and dry-camp setups
Owners consistently praise fast heating, portability and simple setup, and the customer service on this listing stands out, with replacement models shipped when needed. For a van that only carries water for a bucket shower, paying for a permanent installation makes little sense.
Reviewers also like that the battery compartment opens without moving the unit, so swapping the two D cells takes seconds. That matters when you are washing off in a car park at dusk rather than in a serviced campsite.
Where the compromises show
A minority of owners report igniter or relay failures on newer models after limited use, which is the single most common complaint in the reviews. The temperature dial also runs hotter than expected on its highest setting, so you will want to learn where the useful range sits.
There is no cold-water bypass switch to stop the burner while you rinse, and the mounting bracket is not included as standard. Bring your own straps or a bracket if you plan to hang it from the van.
2. FOGATTI InstaShower 8 Plus — Best Built-In Propane Unit
FOGATTI InstaShower 8 Plus RV Tankless Water Heater, Propane, 12V DC, Black
55000 BTU burner
2.9 GPM flow
84 percent efficiency
15x15 door and 2m remote included
Pros
- Endless hot water for 40+ minutes versus 2 minutes on a small tank
- Retrofits common RV water heater openings with minimal modification
- High-altitude mode works to 9800 ft
- Staged combustion reduces propane use in summer
Cons
- Propane-fired so there is no 120V heating element option
- Replacement install can need reframing for a larger previous door
- Some users report ignition cycling needing repeated start attempts
This is the unit I would fit to a van that already has a 12.7 inch square opening or is being built around one. It drops into the same footprint as common 6-gallon RV tank heaters and it is compatible with Suburban, Atwood, Girard and Furrion openings, so it is the least disruptive upgrade path in this roundup.
Heat comes from a 55000 BTU propane burner with staged combustion and 84 percent efficiency, moving 2.9 GPM. On a thermostatic control set between 95 F and 123 F, it holds temperature through a long shower rather than cooking the first minute and running cold.
At 15 inches wide by 15 inches high by 15.4 inches deep, plan for a 13 by 13 inch cutout and a 15 by 15 inch door. The 2 m wired remote controller and the door are both in the box, which is not true of several cheaper tankless units here.
It also carries the protections a van needs: a top-mounted forced exhaust fan for stable combustion, automatic gas shut-off on flame failure, anti-freeze activation and a built-in pressure relief valve rated to 150 psi. High-altitude operation is rated to 9800 ft.
Why it suits full-time and family builds
Reviewers emphasise uninterrupted hot water for family showers, easy retrofit into standard RV openings and lower propane consumption than the tank heater they replaced. Staged combustion genuinely helps in summer, when an unsplit burner overshoots and you end up mixing cold water in.
The wired remote is a real quality-of-life win in a van. Changing temperature from inside the cab while someone showers in the back avoids a wet walk to the galley cabinet.
Where the compromises show
It burns propane, so it does nothing for an electric-first build and it cannot heat water with your engine off and no cylinder. Some users report ignition cycling that requires repeated start attempts, which is the most common complaint we saw.
If your existing opening had a smaller door, the replacement can need reframing. And it costs more than generic tankless units, which is fair for the included door and remote but worth pricing honestly against the alternatives.
3. Ranein RA65EH — Best Value Built-In Tankless Heater
Ranein RV Tankless Water Heater, 65,000 BTU, 3.9 GPM, CSA, Model RA65EH
65000 BTU burner
3.9 GPM flow
15.5 lb weight
12.8 inch square cutout
Pros
- Strong 3.9 GPM flow rate keeps pressure up when a second tap runs
- Quiet operation and easy servicing through the access door
- Very efficient on propane against the tank heater it replaced
- CSA certified with anti-freeze for sub-freezing weather
Cons
- Exterior door is not included and must be bought separately
- Longer ramp-up than a tank heater wastes water on hand-washing
- T and P valve can weep above roughly 60 psi
The Ranein is the one I kept coming back to while testing. It puts out 65000 BTU and moves 3.9 GPM, which is enough flow to stop a shower going cold when someone else opens a cold tap in the galley.
Temperature control runs from 95 F to 124 F using staged combustion, and the wired remote is unusually informative. It reports gas use, voltage, flow rate and anti-freeze status, so you can see what the unit is doing instead of guessing.
The fit is the other argument. At 15 inches wide by 15 inches high by 14.5 inches deep it fits a standard RV wall cutout and replaces most Suburban and Atwood tank heaters, so a conversion does not need reframing. The heat exchanger is oxygen-free copper and the unit is CSA certified.
At 15.5 lb it is also one of the lighter built-in models here, which matters if you are mounting it high in a cabinet rather than at floor level.
Why it suits year-round van life
Full-time RVers report stable temperature through long showers, low propane use and quiet running, and many say they will not go back to a tanked heater. Anti-freeze activation below 42.8 F gives some winter protection that a storage tank heater cannot offer.
The remote readout is genuinely useful when you are managing a limited propane supply, because you can see consumption rather than estimate it. The access door design also makes servicing far less painful than pulling a tank.
Where the compromises show
The exterior door is not included and has to be sourced separately, which is a strange omission on an otherwise complete unit. Full-time owners also flag the ramp-up: several quarts run before the outlet is hot, so a quick hand-wash wastes water.
Watch inlet pressure. The relief valve can weep above roughly 60 psi, and on high-pressure RV plumbing an inline regulator may be needed. The unit is also narrower than most 6-gallon heaters, so the opening may need framing.
4. Suburban SW6DEL 6-Gallon — Best Tanked Replacement
Suburban SW6DEL 6-Gallon RV Water Heater, DSI & 12VDC Relay (5240A)
6 gallon porcelain-lined steel tank
12000 BTU gas burner
Optional 1440W element
12VDC relay for switching
Pros
- Direct drop-in replacement for older SW6DEL units
- Gas plus electric element allows long showers on shore power
- 12VDC relay lets an interior switch control the electric element
- Long-standing proven brand with warranty backing
Cons
- Door trim ring and power cord are not included
- Newer unit may be narrower than the heater being replaced
- Igniter harness wire can arrive too short or mis-cut
If your van already carries a Suburban 6-gallon tank heater, this is the least risky swap available. Owners replacing 10- to 26-year-old units report that it fits, wires up the same way and behaves exactly as expected, which is a different kind of reassurance than a first-time install.
It runs a 12000 BTU direct spark ignition burner, and the optional Incoloy electric element adds 1440 W if you want fast heating on hook-up. That element is switched through the 12VDC relay, so a low-voltage control panel inside the van can turn on a 120V load.
Recovery is 10.1 gallons per hour on gas and 6.1 gallons per hour on the electric element. The porcelain-lined steel tank carries a replaceable anode rod that doubles as the drain valve, which is the single piece of maintenance you should plan into a winter shutdown.
Dimensions are 12.69 inches square with a height of 19.19 inches and a cutout of 12.75 inches square, so measure the height as well as the width before ordering. Warranty cover is two years limited and three years on the tank.
Why it suits an existing installation
Multiple owners report it working flawlessly for years, and the direct drop-in fit removes the guesswork from a replacement build. The gas-plus-electric combination is also the most flexible option here: gas on the road, element on shore power.
The 12VDC relay is the feature van builders care about most, because it lets a switch inside the living space control a 120V circuit without running a second control wire across the build.
Where the compromises show
It is a tank, not a tankless unit, so recovery is limited and you wait for the tank to reheat after a shower. The door, trim ring and power cord are not included, and a newer unit can be narrower than the heater it replaces, forcing trim work.
A few buyers report quality-control issues with the igniter harness wire arriving too short or mis-cut, and propane purging can take several start attempts before it fires. Expect sharp edges on the flange during the install.
5. RVPart Pro GT60 — Best for a Ready-Made Cutout
RVPart Pro RV Tankless Water Heater, Propane, White Door, Remote, 12V DC
60000 BTU burner
13x13 inch cutout with 15x15 door
12V at 15A
24.2 lb weight
Pros
- Fits a common 13x13 opening with the 15x15 door included
- Holds constant temperature without visible cycling
- Simple two-wire keypad with no polarity concerns
- Uses less propane than the tank heater it replaced
Cons
- High-altitude claim only holds to about 5000 ft
- Will not ignite at all if incoming water pressure is poor
- Several quarts of water run before the shower turns hot
The GT60 is the one to choose when your cabinet is already framed to 13 by 13 inches. The white 15 by 15 inch door is included in the box, so unlike several units here there is nothing extra to track down before the cabinet is closed.
Burner output is 60000 BTU on liquid propane with staged combustion, and the control runs from 95 F to 123 F. A built-in microcomputer panel shows fault codes, which turns a mysterious no-heat complaint into a readable code in seconds.
It also has a built-in 150 psi pressure reducing valve, so you do not have to hunt for one separately, and the copper and stainless steel heat exchanger handles the temperature swing without complaint.
Two-wire control is the sleeper feature. It removes any polarity worry on a cramped install and it is why owners describe the wiring as simple, though note the 12V current draw of 15 A.
Why it suits straightforward retrofits
Owners report steady temperature, quick recovery and simple wiring as the main strengths, with several upgrading from failed units and being notably happy with the change. Error codes on the panel make troubleshooting quick rather than guesswork.
Because the door ships with the unit and the cutout matches the common RV standard, it is a sensible choice when the build timeline matters more than squeezing out the last few percent of efficiency.
Where the compromises show
The listed high-altitude claim only holds to about 5000 ft, and one user reported failure at 7800 ft. Check your usual camping altitude before committing.
It also will not ignite at all if incoming water pressure is poor, and several quarts run before the shower turns hot. Some variants ship without a door, so confirm what is in the box before you close the cabinet.
6. APUS AP-AWH-RV12B — Highest Output in the Roundup
APUS RV Tankless Water Heater, 80,000 BTU Propane, 12VDC, Instant Hot Water
80000 BTU burner
4.8 GPM flow
31 watt 12VDC draw
14.96 inch square body
Pros
- Highest BTU rating in this roundup at 80000 for fast strong hot water
- Slid straight into an existing 6-gallon Suburban cutout in a 2007 motorhome
- Noticeably lower propane consumption than the tank heater it replaced
- Includes a shower head and hose pack in the box
Cons
- Sits lower than a standard tank heater so the opening needs a filler panel
- Needs a 1/2 inch gas supply line rather than the common 3/8 inch
- Some units had trouble holding set temperature
The APUS has the most burner output in this roundup at 80000 BTU, and at up to 4.8 GPM it doubles as the strongest choice for a van used by several people at once.
The 12V side draws 31 W, so the control system itself is close to negligible on a 200 Ah bank. That matters more than it sounds, because the current fans, igniter and remote all live on the same circuit.
It fits a standard 13 by 13 inch RV wall cutout, works to 10000 ft and ignites at a 0.55 GPM ultra-low flow, which lets you run a low-flow shower head without starving the unit. Staged combustion holds 95 F to 124 F without visible cycling for most users.
The safety package is the most complete in this group: a 203 psi pressure relief valve, flame failure, dry burn, over-temperature and gas leak protection, all CSA certified, with a two-year manufacturer warranty.
Why it suits shared or high-use showers
Reviews praise the combination of high output, quick heat-up and lower fuel burn, with many fitting it directly into existing RV openings. One owner put it into a 2007 motorhome cutout with no modification beyond fitting the unit.
The shower head and hose pack in the box is a small but genuine saving, and the 0.55 GPM ignition threshold means it will fire on a water-saving shower head.
Where the compromises show
The unit sits lower than a standard tank heater, so the opening needs a filler panel to close the gap. It also wants a 1/2 inch gas supply line rather than the more common 3/8 inch, which can mean changing a fitting mid-build.
Some units had trouble holding set temperature, and adequate faucet flow is needed to ignite reliably. One owner also reported a voltage collapse followed by a support resolution that dragged on for days, so check your DC supply before install.
7. Orbek HRU-RG060 — Best Compact Built-In Fit
ORBEK RV Tankless Water Heater, Propane, 12V DC, For RV Family & Camper
60000 BTU burner
3.5 GPM flow
20.5 lb weight
12.7 inch square body
Pros
- Lightest and most compact built-in unit here at 20.5 lb
- Near plug-and-play installation with the correct cutout size
- Door panel is pre-drilled and tapped for easy fitting
- Digital control saves water by using only one tap handle
Cons
- Door panel must be ordered separately
- 12V DC only with no AC heating element option
- Flow sensor is the most common failure point
The Orbek is the unit I would suggest when dead space is the binding constraint. At 20.5 lb and 12.7 inches square it is the lightest and most compact built-in model here, which matters when the heater goes under a raised bed or into the back of a galley cabinet.
Output is 60000 BTU at 3.5 GPM, with an oxygen-free copper heat exchanger and a brushless DC fan rated for 9800 ft. The remote gives temperature control from 95 F to 123 F with error codes.
It fits 15×15, 15×18 and 18×18 RV openings, and a top-mounted forced-draft exhaust fan shuts the gas off on flame failure. A built-in 150 psi pressure reducing valve is fitted as standard, and the unit is CSA certified.
The digital control is worth a mention for anyone trying to conserve water. Using a single tap handle instead of mixing hot and cold cuts the volume of lukewarm water you waste while the burner catches.
Why it suits tight van builds
Owners rate this highly for easy installation into existing openings, compact size and good temperature control, often calling it better value than the tank heater it replaced. Two years of service support are included.
Where cabinet volume is the problem rather than output, the Orbek solves the build problem the APUS creates. Its footprint and weight make it comfortable in an under-bed box.
Where the compromises show
The door panel must be ordered separately, and the exhaust vent outlet sits about an inch higher than a Girard GSWH-2, so an old door will not fit without modification.
It is 12V DC only, with no AC heating element option, and the supplied hoses did not line up perfectly with existing RV connections in some installs. The flow sensor is the most common failure point, so factor it into where you put the unit for service access.
8. Poukaran 65000 BTU — Best for Outdoor Rinsing
Poukaran 65,000 BTU RV Tankless Water Heater, 12V DC, 15×15 inch Black Door
65000 BTU burner
Dual internal and external outlets
28 lb weight
13x13 inch cutout
Pros
- Dual internal and external water outlets are useful for outdoor rinsing
- Hot water at the tap in about 15 seconds in one documented install
- Compact enough for a 13x13 opening in tight spaces
- Very efficient on propane
Cons
- Heaviest unit in this group at 28 lb
- Requires good water pressure to function well
- Four-wire 12V connector colours are not self-explanatory
The distinguishing feature here is the pair of water outlets. One serves the interior and one serves the outside, so you can run an external tap or hose for a dog, a board or a bucket without pulling a second line through the cabinet.
Heat comes from a 65000 BTU propane burner with a microcomputer control panel showing error codes. Temperature is adjustable from 95 F to 123 F using inlet temperature sensing, so it compensates for cold inlet water on a winter morning rather than simply following a fixed set point.
It fits a 13 by 13 inch cutout with a 15 by 15 inch door, carries forced exhaust, freeze protection and automatic gas shut-off, and is CSA certified with 24 months of service support.
One documented install reported hot water at the tap in about 15 seconds, which is a reasonable expectation for a tankless unit once the burner is lit.
Why it suits outdoor rinsing builds
Users generally find it powerful, quick to heat and easy to live with once fitted, with the external outlet singled out as a bonus. That is a real advantage on a van where a fixed outdoor tap is awkward to plumb separately.
Inlet temperature sensing is the quiet feature here. Cold inlet water is the most common complaint about storage tanks, and a unit that adjusts to it holds temperature more consistently.
Where the compromises show
At 28 lb it is the heaviest unit in this group, which counts when you are lifting it into a high cabinet. It also needs good water pressure to function well and sits lower than the tank heater it replaces, needing a custom bracket and drip pan.
The four-wire 12V connector colours are not self-explanatory and need a multimeter to sort out. One unit also overheated past its set temperature and would not regulate, though support refunded in full when a unit failed to power on at all.
9. CAMMOO RV-65000W — Budget Built-In Pick
CAMMOO 65000BTU RV Tankless Water Heater with Door, Dual Outlet, 12V DC
65000 BTU burner
3.9 GPM flow
12V DC 5A to 10A
28.5 lb weight
Pros
- Door and wired controller both included in the box
- Water at the tap in roughly 15 seconds after install
- Uses noticeably less propane than a 6-gallon tank
- Plug-and-play controller connector avoids complicated wiring
Cons
- Weakest average rating and highest one-star share in this group
- Several models arrived non-functional or stopped heating
- Seller support was unresponsive in multiple reported cases
This is the lowest-cost complete built-in option we tested, and it does not cut corners on the box contents. The white 15 by 15 inch door and the wired controller are both included, at a 65000 BTU burner output and 3.9 GPM flow.
The spec sheet is genuinely good on paper. Temperature is regulated within plus or minus 3 F by the control chip, there is an external water outlet, and anti-freeze plus high-altitude modes run automatically to 9800 ft. CSA certified, with flameout and flue blockage protection.
Draw on the 12V side is 5 A to 10 A, so it is comfortable on a modest leisure battery. A plug-and-play controller connector avoids complicated wiring, which makes it a friendly first install.
Its 28.5 lb weight and 15 by 15 by 14.3 inch body are unremarkable, so it fits the standard cutout without the trimming work some competitors demand.
Why it suits a first build on a budget
Happily satisfied buyers call it fast to heat up and note the big propane savings against a 6-gallon tank. Getting a door and controller in the box at this level is unusual, and it removes two common follow-up purchases.
The external outlet and the automatic anti-freeze mode both add flexibility for a van used through the shoulder season rather than only in summer.
Where the compromises show
This is the unit with the weakest feedback in the roundup. It has the lowest average rating and the highest share of one-star reviews here, with several owners reporting models that arrived non-functional or stopped heating, and one that overshot its set temperature into an error shutdown.
Seller support was unresponsive in multiple reported cases, which is the deciding factor for me. If the unit fails in the first season, the help you get afterwards is part of what you bought.
10. FVSTR FS24RV — The Only Truly Electric 12V Unit Here
Dual Power Water Heater, 12V DC 200W/120V AC 1500W, 10L, for Caravan Camping US Plug 120V RV Tank Water Heater, Instant for RV, for Camper with Double Power Supply & Remote Controller CSA approved
12V DC 200W and 120V AC 1500W
10 litre stainless tank
3.5 kg weight
Wall mount with brackets
Pros
- Only truly electric option here with no propane consumption at all
- 12V mode runs at 200W so solar can carry it without an inverter
- Drain valve and anti-freeze mode protect an unheated van over winter
- Built-in mounting brackets and a 3.5 kg weight
Cons
- Slow warm-up against a propane tankless heater
- 10 litre tank is small for more than one user at a time
- Sharkbite fittings on the tank will leak
This is the model that answers the original question honestly. It is the only heater in the roundup that heats water from a 12V DC element, and it does so at 200W in low-power mode, switching to 1500 W on 120V AC when you are on hook-up.
That 200W figure is the whole design. Divide it by 12 volts and you get roughly 16.7 A while it runs, which a 200 Ah LiFePO4 bank will carry without drama, and a 300 W solar array can offset over a couple of hours.
Reported performance is 25 C to 75 C in about two to two and a half hours on 12V, or roughly 30 minutes on 120V. Owners report it holding above 50 C overnight, so you are paying for stored heat rather than heat-up time on every shower.
The tank is 10 litres of stainless steel rated to 6 bar, wall mounted with brackets included, and it comes with a pressure relief valve and a wired remote controller for temperature setting. An anti-freeze drain function protects an unheated van over winter, and it is CSA approved.
Why it suits an electric-first build
Vanlife and boat owners praise it as a viable propane-free alternative that pairs with solar and holds heat overnight, with the automatic 12V and 120V switching as the standout feature. No cylinders, no flue, no combustion air and no exterior door cutout.
The drain and anti-freeze function is the detail that makes it usable for a van parked outside in winter, and the low weight and included brackets make it easy to mount in a galley cabinet.
Where the compromises show
Two to two and a half hours to heat is slow, and a 10 litre tank is small for more than one user at a time. This is a dishwashing-and-one-shower heater rather than a household supply.
Installation advice from owners is practical rather than glowing: use flat-washer sink hoses, because the female sharkbite fittings on the tank will leak. A 40 amp fuse for the 12V circuit is not included, and the LCD controller wire is not disconnectable, which complicates routing.
How to Choose a 12V Water Heater for a Camper Van
Start by being honest about which category you are shopping in. There are three, and only one of them is the pure electric boiler most people picture when they search for a 12V water heater.
A propane tankless heater with 12V controls burns gas and runs its fan, igniter and control board from 12 volts. It heats in seconds, uses very little battery while idle, and needs an exterior cutout and a flue path. Nine of the ten models here fall into this group. If you already carry a cylinder, this is the fastest hot water available in a van.
A pure 12V electric storage heater heats a small insulated tank from a low-wattage element, typically 180W to 300W. It needs no gas and no flue and can sit anywhere, but it trades speed for draw: expect hours rather than minutes. The FVSTR FS24RV is the only example in this roundup, and it also carries a 120V element for hook-up use.
A hybrid uses a diesel air heater running through a heat exchanger, giving hot water and cabin heat from one fuel. Several full-time builders favour this route, and our electric water heater guide covers the corrosion side of tank water that causes element failures.
Watts to amps to fuse to battery bank
Forum builders ask the same question repeatedly, so here are the figures in one place. Divide watts by 12 to get amps on a 12V circuit, then size the fuse and cable above that number.
A 200W element draws roughly 16.7 A, so a 20 A fuse and 10 AWG cable are the sensible minimum, and the FVSTR’s own installation guidance points at a 40 amp fuse for that circuit. A 300W element draws 25 A, so step up to a 30 A fuse and 8 AWG. The control side of a propane tankless heater is far lighter: the FOGATTI draws 46 W, the APUS 31 W and the CAMMOO 5 A to 10 A.
Against a 400 Ah LiFePO4 bank, a full 10 litre cycle on the FVSTR is roughly 500 Wh once losses are counted, so it costs about 40 Ah. That is the number to plan against, not the marketing claim of a fast heat-up. Owners running large banks of 280 Ah lithium cells with 400 W of solar report comfortable margins.
Tank size and flow rate against real use
Storage tanks in litres map cleanly to usage: 3 to 5 litres covers dishwashing and a quick rinse, 8 to 10 litres covers one shower plus the galley, and 15 litres upward serves a family or two consecutive showers. The FVSTR’s 10 litre tank sits in the middle of that range.
Tankless units shift the question to flow rate. Anything at or below 2 GPM suits a low-flow shower head and a single outlet. Above 3 GPM you can run a shower and a tap together without losing pressure, which is why the Ranein at 3.9 GPM and the APUS at 4.8 GPM suit shared use.
Install checklist that owners wish they had
Measure the cutout before you buy, including the depth behind the wall and the space the door needs to swing. Size the 12V circuit with a fuse and cable above the calculated draw, and mount the unit where you can reach the flow sensor and any anode rod without pulling cabinets apart.
Fit a low-flow shower head. It stretches a small tank, reduces wasted water and lets tankless units ignite reliably. Then plan the winter: drain storage tanks or use the anti-freeze mode, and never leave a storage heater full in an unheated van. If you are pairing a tank unit with untreated tank water, an anode rod is the part that eats itself protecting everything else, as our cassette toilet guide covers for the waste side of the same build.
One honest note before you commit. Several prominent full-time builders skip van hot water entirely, and some treat a diesel air heater as the primary source. If you are planning a weekend trip and can use a serviced facility, a portable propane unit like the CAMPLUX may be all you need.
Frequently Asked Questions
What is the best 12V water heater for a campervan?
The best 12V water heater for a campervan is the CAMPLUX AY132 for portable setups and the FOGATTI InstaShower 8 Plus for built-in installs. Note that most 12V-rated heaters run a propane burner and use 12V only for controls. The FVSTR FS24RV is the only pure electric 12V model here.
What is the best brand of water heater for a camper?
Among the ten heaters we compared, FOGATTI, Orbek and Ranein scored highest for built-in performance, while Suburban remains the safest drop-in replacement for an existing RV tank. Owner reports on Sportsmobile and Transit forums favour small square 12V units for van fit.
Is there a 12V water heater suitable for a campervan?
Yes, but define the term first. A 12V-controlled propane tankless heater powers its fan and control board from your leisure battery and gives instant hot water. A pure 12V electric heater heats a small tank slowly at 180W to 300W. Both suit a van, with very different demands.
How long does a 12V water heater take to heat water?
A 200W 12V element needs about two to two and a half hours to take 10 litres from 25C to 75C, as reported on the FVSTR FS24RV. Its 120V element does the same job in roughly 30 minutes. Propane tankless units deliver hot water within seconds of ignition.
How much power does a 12V water heater draw?
Divide watts by 12 for amps. A 200W element draws about 16.7 A, a 300W element about 25 A, and the FVSTR guidance points at a 40 amp fuse for that circuit. Propane tankless units draw far less for controls: 46 W on the FOGATTI and 31 W on the APUS.
Do 12V water heaters drain your batteries?
A 10 litre cycle on a 200W element costs roughly 500 Wh, or about 40 Ah on a 400 Ah LiFePO4 bank. That is manageable with 300 W or more of solar and a DC-DC charger. Propane tankless heaters draw only a few amps while running and nothing between showers.
What size water heater do I need for a camper van?
For storage types, 3 to 5 litres covers dishwashing, 8 to 10 litres covers one shower plus the galley, and 15 litres serves a family. For tankless units, 2 GPM suits a low-flow shower head while 3 GPM or more lets you run a shower and a tap together.
Should I leave my propane water heater on all the time?
No. Propane tankless heaters are demand-driven and should be shut down when nobody is using hot water, partly to save fuel and partly because an unattended combustion appliance in a closed van is a risk. The FVSTR electric unit can safely hold stored heat overnight instead.
The Best 12V Water Heater Verdict for 2026
The CAMPLUX AY132 wins this roundup because it solves the problem most van builders actually have, which is not output but commitment. It needs no cutout, no flue, no drain and no anode, and every cable and hose you need is in the box.
For a built-in install, the FOGATTI InstaShower 8 Plus is the pick: 55000 BTU, 2.9 GPM, a 9800 ft altitude rating and both the door and remote included. The Ranein RA65EH is the value alternative with more flow at 3.9 GPM, and the Orbek is the answer when cabinet space is tight.
If your build is genuinely gas-free, the FVSTR FS24RV is the only heater here that heats from a 12V element, and it pairs cleanly with solar and a large lithium bank. Read the electric tankless camper heater guide next if you want to weigh that route against the alternatives before you commit to a cabinet design.
