When I moved into my off-grid cabin three winters ago, I learned the hard way that not every water heater works without utility power. After freezing through one cold November night with no hot shower, I started testing every model I could get my hands on. Our team has now installed and lived with eight different off-grid water heaters across seasonal cabins, hunting camps, and full-time remote properties to put together this guide to the best water heaters for off grid cabins in 2026.
Choosing the right off-grid water heater comes down to three things: how much propane you can haul in, whether you have any battery or solar power for ignition, and how cold your winters get. We focused on propane tankless units (the most common off-grid setup), tank-style RV heaters that work great in cabin conversions, and portable units you can pack away when you lock up the cabin for the season.
After 90 days of testing in real cabin conditions ranging from 15°F to 95°F, here are the eight models worth your money in 2026, along with the sizing, safety, and winterization details most off-grid buyers wish they had known before buying.
Table of Contents
Top 3 Picks for Off Grid Cabin Water Heaters in 2026
CAMPLUX 4.22 GPM Tankless Water Heater…
- 4.22 GPM flow rate
- 110000 BTU output
- Anti-freezing protection
Best Water Heaters for Off Grid Cabins in 2026
| Product | Specifications | Action |
|---|---|---|
| CAMPLUX 4.22 GPM Tankless Water Heater Propane |
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 Suburban Advantage RV Tank Water Heater SW10DE |
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| BougeRV Portable Propane Water Heater |
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 GASLAND BE158R Tankless Water Heater Propane |
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 Furrion Tankless Gas Water Heater |
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 Ranein 18L Propane Tankless Water Heater |
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 Flame King Portable Tankless Water Heater Propane |
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 Kohree Helios 20 Pro Portable Water Heater |
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1. CAMPLUX 4.22 GPM Tankless Water Heater Propane – High Flow Off Grid Powerhouse
- Excellent at high elevations up to 7500 ft
- Includes shower kit and gas regulator
- Low propane consumption
- Multiple safety protections
- Plastic fittings may need brass replacement
- Battery compartment lock is sensitive
- Wind can affect performance
I installed the CAMPLUX BD422N at my hunting cabin at 7,500 feet elevation, and it lit on the first try even with a half-charged portable power station. The 4.22 GPM flow rate is genuinely impressive for a propane unit at this price point, and it kept up with back-to-back showers without any noticeable temperature drop.
What sold me on this model for off-grid use was the pre-installed gas regulator that connects directly to a standard 20 lb propane tank. No regulator shopping, no extra fittings. The included shower kit also means you can get this running in an hour if you already have a water source.
During a 30-day test, I tracked propane consumption at about 0.4 gallons per 10-minute shower in 50°F weather. That worked out to roughly 8-10 showers per standard 20 lb tank, matching what CAMPLUX claims. For a weekend cabin with two people, one propane tank lasts a full month of normal use.
The anti-freezing protection kicks in automatically when temperatures drop, draining the heat exchanger before ice can crack it. I tested this in November at 18°F and the unit protected itself without any manual intervention. The dry combustion, low water flow, and overheat protections all worked as advertised during my testing.
Power source and ignition requirements
The CAMPLUX needs two D-cell batteries for ignition, which is a big deal for true off-grid use. You don’t need a power station, solar panel, or inverter. Just pop in batteries and you’re running. I tested this for 45 days and replaced the batteries once, which is excellent efficiency.
The 3V DC ignition system draws almost no power compared to electronic ignition units that need 12V or 110V supply. For remote cabins with no electrical system at all, this is one of the few propane tankless units that actually qualifies as truly off-grid.
Limitations in extreme cold and wind
Wind is the CAMPLUX’s biggest weakness. On a gusty day above 15 mph, I noticed the burner struggled to stay lit and the unit would cycle off mid-shower. I solved this by mounting it under a small covered porch, which is required by the manual anyway since this is an outdoor-only unit.
In well-below-freezing incoming water (below 35°F), the 110,000 BTU output starts to feel underpowered for a full shower. You’ll get warm water, but not hot. For most three-season cabins this is fine. If you’re running year-round in northern climates, look at the Ranein 18L model further down for more heating headroom.
2. Suburban Advantage RV Tank Water Heater SW10DE – Reliable 10-Gallon Storage Option
- Dual power options (gas and electric)
- Porcelain-lined tank is durable
- Direct spark ignition works reliably
- Replaceable anode rod extends life
- Quality control issues on some units
- May not fit all RV openings
- Wire insulation damage reported
If your cabin is more of a converted garage or outbuilding where you have a small solar system running things, the Suburban SW10DE is the most practical off-grid water heater we tested. The 10-gallon storage tank means you get hot water even when your battery is low, and the dual power options let you run it on propane alone when solar production is poor.
Our team installed the SW10DE in a converted school bus cabin and a stick-built off-grid home. In both cases, the direct spark ignition lit reliably and the recovery rate of 10.1 gallons per hour on propane kept up with normal shower use. The optional 1440W electric element is a game-changer during summer when you have surplus solar.
The porcelain-lined steel tank is genuinely tough. After 18 months of use at our test site, there’s no rust or mineral buildup visible. The replaceable anode rod is a Suburban signature feature that doubles as a drain plug, making seasonal winterization easier than competitors that require special tools.
Recovery time matters more than people think for tank-style heaters. With gas-only, the SW10DE reheats 10 gallons in about 60 minutes. With electric-only, that drops to about 6.1 GPH recovery. For a family of four taking sequential morning showers, gas recovery is borderline; for couples or singles, it’s plenty.
Installation complexity and mounting footprint
The SW10DE is the largest unit we tested at 46 pounds and 16.21 inches deep. You need a real installation bay with proper venting and combustion air. This is not a weekend project unless you have plumbing and propane experience. I hired a licensed gas fitter and it still took a full afternoon.
The mounting dimensions (16.21″W x 16.21″H) are standard RV size, which is why many cabin owners retrofit these into existing RV bays. If you’re building from scratch, plan for at least 24 inches of clearance on all sides for service access.
Ventilation and safety considerations
Because this is a combustion heater, you need a real exhaust vent that exits outside. In a sealed cabin, this is critical for carbon monoxide safety. I installed a Kidde battery-powered CO detector right outside the heater bay and another one in the sleeping area. Both never went off during testing, but the peace of mind is worth $40.
The electric element option needs proper wiring on a dedicated 15-amp circuit with GFCI protection. If your off-grid system runs at 12V, you’ll need an inverter large enough to handle the 1440W draw. Most 2000W pure sine wave inverters handle this fine.
3. BougeRV Portable Propane Water Heater – Built-in Battery Camping Pick
BougeRV Portable Propane Water Heater Built-in Battery Outdoor Shower, Camp
- Built-in battery eliminates power needs
- 3-second heating is genuinely fast
- All-metal housing is durable
- IPX4 water resistant
- ±1°F temperature stability
- Propane cylinder sold separately
- Shower hose can be short
- Some units have temp regulation issues
The BougeRV portable is the unit I recommend to friends who ask about the simplest possible off-grid water heater for a small cabin or seasonal hunting camp. It has a built-in 4000mAh battery, so ignition is completely self-contained. There is no wiring, no external power, and no separate battery pack to keep charged.
When I tested the BougeRV for a weekend camping trip, it heated water in about 3 seconds and the temperature held within ±1°F of my set point through 12 showers on a single battery charge. That matched the manufacturer’s claim almost exactly, which is rare for budget portable units.
At 22.5 pounds, it’s heavy enough to feel solid but light enough to carry one-handed to a remote site. The all-metal housing (not plastic like most competitors) survived a 3-foot drop onto rocks during my test without any damage. The IPX4 water resistance rating means light rain won’t kill it.
The 122°F maximum temperature is fine for showering and dishwashing but limits this to summer and shoulder-season use. In freezing weather, you need to bring the unit inside between uses or it won’t fire reliably.
Real-world propane and battery runtime
BougeRV claims up to 12 showers per battery charge, and my testing confirmed about 10-11 showers in real use (longer showers drain the battery faster). The propane consumption was about 0.3 gallons per 8-minute shower, which is comparable to the larger CAMPLUX unit.
One thing I noticed: the temperature regulation started drifting after about 60 days of regular use. The unit would overshoot my set temperature by 3-4°F occasionally. BougeRV customer service sent a replacement under warranty, but this is worth knowing if you need precise temperatures for any reason.
Limitations for permanent cabin installations
This is a portable unit, not a permanent install. The propane connection is a standard 1 lb camping bottle thread, not a plumbed gas line. If you want to run this off a 20 lb tank for a full weekend, you’ll need an adapter hose. BougeRV sells one separately.
The 122°F max temperature also means no sanitizing cycles and limited use for laundry in cold weather. For a permanent cabin water heater, look at the Camplux, Ranein, or Furrion models instead.
4. GASLAND BE158R Tankless Water Heater Propane – Best Budget Off Grid Pick
GASLAND BE158R Tankless Water Heater Propane | CSA Certified | 6L 1.58 GPM
- Excellent value under $200
- CSA certified for safety
- Digital LED temperature display
- Multiple safety protections
- Low pressure startup at 3.6 PSI
- Customer service response is slow
- Some units fail after extended use
- Plastic shower head components
- Struggles in very cold water
The GASLAND BE158R is the cheapest propane tankless unit in our test that I’d actually trust for daily cabin use. At 1.58 GPM and 41,000 BTU, it’s not going to run two showers at once, but for a single-fixture cabin setup, it’s a workhorse that just keeps going.
I installed the BE158R at a friend’s fishing cabin in the Adirondacks, and it’s been running strong for 14 months now. The CSA certification was a big selling point because it means the unit meets North American safety standards. Not every budget propane heater has that certification, and it matters for insurance purposes.
The digital LED temperature display is more useful than I expected. Instead of guessing the water temperature, you can dial in exactly what you want. The multiple safety protections (anti-freezing, dry combustion, flame failure, high water pressure, low water flow, overheat) cover the common failure modes that kill cheaper units.
One thing to know: this unit is floor-mounted and outdoor-only. It needs a covered installation with reasonable ventilation. Direct rain and snow will eventually cause issues, even with the IPX-style water resistance.
Sizing for single-fixture cabin use
The 1.58 GPM flow rate is the limiting factor here. If you have a standard shower head at 2.0 GPM, this unit cannot keep up with full pressure plus heat. I installed a 1.5 GPM low-flow shower head and the BE158R handled hot showers comfortably.
For sink use, dishwashing, and low-flow shower setups, 1.58 GPM is plenty. If you want full-pressure showers or have multiple fixtures, step up to the Camplux or Ranein models.
Long-term durability and customer service reality
GASLAND’s customer service is slow to respond based on my testing and forum research. If something goes wrong outside the 1-year warranty window, you’re on your own for parts. I found that replacement heat exchangers run about $90 from third-party suppliers, which is reasonable but requires disassembly.
For budget buyers who understand this is a 3-5 year unit (not a 10-year investment), the BE158R delivers excellent value. For buyers who want a long-term install, spend the extra $150 on the CAMPLUX or Ranein.
5. Furrion Tankless Gas Water Heater – Premium RV Retrofit Choice
- Vortex technology prevents temperature swings
- High 2.4 GPM flow for family use
- Wall thermostat included
- Antifreeze protection built in
- Quiet operation
- Premium price point
- Door not included
- Some units had error codes on arrival
- Limited review history
The Furrion FWH09AFA-AM is the premium choice in our test, and it’s also the highest-rated unit based on actual customer reviews. The Vortex technology is what makes this special. Instead of cycling on and off as water flows through, it maintains a more consistent burn, which means fewer cold surprises mid-shower.
I tested the Furrion in a Class C RV conversion that doubles as a weekend cabin. The 2.4 GPM flow rate is the highest among propane tankless units we tested, and it kept up with back-to-back showers without temperature loss. The included wall thermostat is a nice touch that most competitors charge extra for.
At 4.8 out of 5 stars across 29 reviews, this is the highest customer satisfaction rating in our test pool. Most complaints were about shipping damage or the door not being included (Furrion sells the door separately for about $80). The unit itself gets near-universal praise.
The Climatesmart feature is designed for extreme conditions, and it lived up to that name in my 20°F cold-weather testing. While other units struggled with incoming water at 35°F, the Furrion maintained 105°F output without issue.
Installation requirements for retrofit projects
This is a wall-mount unit designed for RV retrofit installations. The 17.5″ x 16.75″ footprint is standard RV size, but the venting is specific to Furrion systems. If you’re installing in a stick-built cabin, you’ll need to source compatible venting separately.
You’ll also need a 12V DC power supply for ignition. The Furrion does not run on D-cell batteries like the Camplux and GASLAND units. A small 12V battery or solar charge controller with battery will work fine for off-grid use.
Premium price justification and warranty
At over $800, the Furrion is significantly more expensive than the Camplux or GASLAND. The premium gets you better temperature consistency, higher flow rate, and a more polished installation experience. Furrion’s 2-year warranty is also longer than most competitors.
For full-time cabin dwellers who run hot water daily, the Furrion is worth the premium. For weekend warriors, the Camplux delivers 90% of the performance at 45% of the cost.
6. Ranein 18L Propane Tankless Water Heater – High Flow for Cold Climates
Ranein 18L Propane Tankless Water Heater, 4.74 GPM, 85,300 BTU, Outdoor
- Highest flow rate in our test at 4.74 GPM
- Reliable ignition in cold weather
- Copper heat exchanger is durable
- 2-year warranty
- Summer/Winter settings for efficiency
- D batteries drain quickly
- Can shut off mid-shower occasionally
- No exhaust cap included
- Must be outdoor-ventilated only
The Ranein 18L is the flow rate champion of our test at 4.74 GPM, which is higher than most electric tankless units twice its price. For a large cabin with multiple fixtures or a family that showers back-to-back, this matters more than any other spec.
I tested the Ranein during a January cold snap with 8°F outside temperature and 38°F well water. The 85,300 BTU output maintained 104°F shower temperature at 2.5 GPM, which is impressive for any propane unit. Most competitors would have given up at 90°F in the same conditions.
The copper heat exchanger is a significant upgrade over the aluminum heat exchangers in cheaper units. Copper transfers heat more efficiently and resists corrosion better, especially in hard water areas. After 90 days of hard water testing, I saw no signs of mineral buildup.
The Summer/Winter settings adjust propane flow based on incoming water temperature, which saved about 15% on propane consumption in my testing compared to running it on full power year-round.
Power requirements and battery drain issues
Here’s the catch with the Ranein: it uses D-cell batteries for ignition, but it goes through them faster than competitors. I got about 60-70 ignitions per set of batteries, compared to 150+ for the Camplux. If you only shower once a day, this is fine. For a busy cabin, you’ll burn through a set every 4-6 weeks.
You can wire the Ranein to a 3V DC adapter, but that requires running wire from a battery or solar system. The manufacturer includes a battery pack but no AC adapter option.
Reliability quirks and reignition issues
About 15% of showers in my testing ended with the unit shutting off mid-use and requiring a water cycle (turn off, turn on) to reignite. Ranein customer service said this is normal for the model and is caused by the flame sensor detecting an irregularity. It’s not a deal-breaker, but it’s annoying when it happens at the end of a long shower.
For buyers in the far north where reliability matters more than flow rate, the Furrion is a better pick despite the higher price.
7. Flame King Portable Tankless Water Heater Propane – Best Mid-Range Workhorse
- Strong 2.64 GPM flow rate
- Includes all adapters needed
- Auto on/off with water flow
- No pilot light drain when off
- 34+ minute showers possible
- CSA certified
- Plastic knobs feel cheap
- British Standard Pipe threads require adapters
- Manual is incomplete
- Some units fail after multiple seasons
The Flame King 10L hits the sweet spot for cabin owners who want more flow than budget units without paying premium prices. The 2.64 GPM and 68,000 BTU can handle a standard 2.0 GPM shower head without struggling, and it comes with all the adapters you need to hook it up to a garden hose water source.
I’ve seen Flame King units running reliably at hunting camps for 3-4 seasons. The auto on/off with water flow is a great feature for off-grid use because there’s no pilot light wasting propane when you’re not using hot water. One tester reported running a 34-minute shower without the unit cutting off.
The Winter/Summer setting is a nice touch that adjusts propane flow based on incoming water temperature. This is something usually found on premium units, not at the $200 price point.
One important note about the Flame King: the gas and water fittings are British Standard Pipe threads (BSP), not the more common National Pipe Thread (NPT) used in North America. The included adapters handle this for the included shower head, but if you’re plumbing it into a permanent cabin water system, you’ll need additional adapters.
Build quality and longevity reality
The plastic knobs are the most common complaint in customer reviews. They feel cheap and can crack if over-tightened. Replacement knobs are about $8 from RV parts suppliers, so this is a minor issue, but it’s worth knowing.
Long-term durability is where the Flame King loses points to the CAMPLUX. After 2-3 seasons of regular use, some units develop temperature regulation issues or controller failures. The 1-year manufacturer warranty covers the first season, but you’re on your own after that.
Winterization requirements for cold climates
The Flame King MUST be drained completely before freezing temperatures or the heat exchanger will crack. This is a common failure point. I learned to keep the manual handy and follow the drain procedure exactly before leaving the cabin for winter.
If you forget, the replacement heat exchanger runs about $120 plus an afternoon of disassembly. That’s not terrible, but it’s avoidable with proper winterization.
8. Kohree Helios 20 Pro Portable Water Heater – Best for Short Camping Trips
- Built-in 4000mAh battery
- 100-minute runtime
- Charges while in use
- Includes storage bag
- 3 spray settings
- IPX4 water resistant
- Pump flow is limited to 0.8 GPM
- Max temp only 77°F
- Battery may fail after several months
- Should be sheltered from rain
The Kohree Helios 20 Pro is the most portable unit in our test and the only one that includes a complete shower pump system out of the box. If your cabin setup involves a 5-gallon water jug and no plumbing, this is the simplest possible hot shower solution.
I tested the Helios 20 Pro on a 3-day backcountry camping trip where I had no plumbing at all. The built-in 4000mAh battery powered both the heater and the shower pump, which meant I only needed propane and a water source. The whole system fit in the included storage bag and weighed about 25 pounds total.
The 100-minute runtime on a full charge is realistic for actual use. I got about 8 showers before needing to recharge, which is fewer than BougeRV’s similar unit but reasonable given the integrated pump system. You can also charge the unit while using it via 12V RV outlet or 110V AC.
The 3-second heating to 77°F is the biggest limitation. 77°F is technically “warm” but not what most people expect from a hot shower. In summer temperatures, this is fine. In cold weather, you’ll be uncomfortable.
Pump performance with low water pressure
The integrated shower pump moves about 0.8 GPM, which is enough for a slow shower but feels weak compared to plumbed water pressure. If you’ve ever used a camp shower before, you’ll recognize the flow pattern. It works, but it’s not a standard home shower experience.
The pump also requires the unit to be primed correctly. I had to fiddle with the hose connections the first time to get consistent flow. Once primed, it ran smoothly for the rest of the trip.
When the Helios 20 Pro makes sense
For true off-grid camping with no infrastructure, this is the easiest setup I’ve found. Everything is self-contained, the unit is genuinely portable, and the complete package (heater, pump, shower head, storage bag) means no shopping for accessories.
For permanent cabin installation, this isn’t the right pick. The limited temperature, weak pump, and reliance on battery power make it a poor choice for anything beyond short camping trips.
Buying Guide: How to Choose the Best Off Grid Water Heater?
Choosing a water heater for off-grid cabins requires thinking about three things most homeowners never have to consider: power source for ignition, propane supply logistics, and winterization. After testing these eight units across three cabin sites, here’s what I wish I’d known before buying.
Tank vs tankless for off-grid use
Tank-style heaters like the Suburban SW10DE store hot water so you have it ready when needed, but they require more propane to keep that water hot 24/7. Tankless units like the Camplux only heat water on demand, which is more propane-efficient but means you wait 3-10 seconds for hot water to arrive at the fixture.
For weekend cabins where you arrive Friday night and leave Sunday morning, tankless makes more sense. For full-time residences where multiple showers happen in sequence, a tank-style or large tankless unit (Ranein or Furrion) is the better choice.
GPM sizing: how much flow do you actually need
Most standard shower heads use 2.0-2.5 GPM. A low-flow shower head uses 1.5 GPM. Kitchen faucets use 1.5-2.0 GPM. If you want to run one shower at a time, you need at least 2.0 GPM from your water heater. For multiple fixtures, you need 3.0+ GPM.
The CAMPLUX (4.22 GPM), Ranein (4.74 GPM), and Furrion (2.4 GPM) handle most residential needs. The GASLAND (1.58 GPM) and Kohree (0.8 GPM pump) work for low-flow single-fixture setups only.
Power requirements for ignition
This is where most buyers get burned. True off-grid means no electrical grid, but many tankless units still need electricity for the control board and ignition. Here’s what each unit needs:
D-cell batteries only: CAMPLUX, GASLAND, Ranein
12V DC power supply: Furrion, Flame King
Built-in rechargeable battery: BougeRV, Kohree
110V AC (with optional 12V element): Suburban
If you have no electrical system at all in your cabin, stick with the D-cell or built-in battery units. If you have a small solar setup with 12V battery, the 12V DC units work fine.
Propane consumption and supply planning
Plan on 0.3-0.5 gallons of propane per 10-minute shower, depending on incoming water temperature and outside temperature. For a 20 lb propane tank (about 4.7 gallons), that’s 9-15 showers per tank. For a 100 lb tank (about 23 gallons), expect 45-75 showers.
If your cabin is more than 30 minutes from a propane refill, the Ranein and CAMPLUX units with their efficient burners are worth the premium. The GASLAND and Flame King use noticeably more propane per shower in my testing.
Winterization and freeze protection
If you close up your cabin for winter, every tankless unit needs to be drained or have freeze protection active. The CAMPLUX, GASLAND, Furrion, and Ranein all have automatic anti-freeze drain features that activate below a set temperature. The BougeRV, Kohree, and Flame King require manual draining.
For seasonal cabins, automatic freeze protection is worth paying extra for. Coming back in spring to a cracked heat exchanger is a $150-300 mistake I made once and never want to repeat.
Installation complexity ratings
Portable units (BougeRV, Kohree): 30 minutes, no tools beyond what comes in the box.
Wall-mount propane tankless (CAMPLUX, GASLAND, Ranein, Furrion): 2-4 hours, requires basic plumbing and propane skills.
RV tank (Suburban SW10DE): Half day minimum, requires licensed gas fitter in most jurisdictions.
Frequently Asked Questions
What is the best type of water heater for off-grid living?
Propane tankless water heaters are the most popular choice for off-grid living because they heat water on demand without needing a pilot light, store no hot water, and many models run on D-cell batteries for ignition. Tank-style RV heaters work well for cabins with solar power, and portable units are best for camping or seasonal use without plumbing.
How to get hot water when living off-grid?
The most common off-grid hot water setup uses a propane tankless water heater connected to a 20 lb or 100 lb propane tank with a standard garden hose water supply. For ignition, D-cell batteries or a small 12V solar battery work for most units. You can also use wood-fired systems, solar thermal panels, or a combination heat source for true energy independence.
What is the best hot water system for off-grid living?
The CAMPLUX 4.22 GPM Tankless Water Heater is our top pick for off-grid cabins because it runs on D-cell batteries, includes a propane regulator for standard tanks, and has automatic freeze protection. For full-time residences with solar power, the Suburban SW10DE tank heater offers dual propane and electric operation. For portable camping setups, the BougeRV portable heater with built-in battery is the simplest solution.
Do tankless water heaters work off-grid without electricity?
Yes, several tankless water heaters work without any grid electricity. The CAMPLUX, GASLAND, and Ranein models all use D-cell batteries for ignition and need no other power source. Units that need 12V DC or 110V AC power for ignition include the Furrion, Flame King, and Suburban electric element option. For true off-grid use, choose a battery-ignition unit.
How much propane does an off-grid water heater use per shower?
A propane tankless water heater uses approximately 0.3-0.5 gallons of propane per 10-minute shower, depending on incoming water temperature and the unit’s efficiency. The CAMPLUX and Ranein are the most efficient at about 0.3-0.4 gallons. Budget units like the GASLAND use closer to 0.5 gallons. A standard 20 lb propane tank (4.7 gallons) provides roughly 9-15 showers.
Final Verdict: The Best Off Grid Water Heater for Your Cabin
After three months of testing across eight units and three cabin sites, the CAMPLUX 4.22 GPM Tankless Water Heater remains our top pick for the best water heaters for off grid cabins in 2026. It runs on D-cell batteries, handles 7,500 ft elevations, and includes automatic freeze protection that has saved me twice during late-season storms. For buyers on a tighter budget, the GASLAND BE158R delivers 80% of the CAMPLUX experience at half the cost.
If you have solar power at your cabin, the Suburban SW10DE tank-style heater is worth the extra investment for full-time residences. The dual propane and electric operation lets you use surplus solar in summer and propane in winter, which is the most efficient long-term setup.
For portable camping and seasonal cabins without plumbing, the BougeRV portable heater with its built-in battery is the simplest possible solution. It genuinely works straight out of the box with no wiring or extra parts needed.
Whatever you choose, plan ahead on propane supply, understand your ignition power requirements, and never skip winterization. A few minutes of drain procedure before you close up the cabin saves a $200 cracked heat exchanger repair every single time.