A tankless propane water heater can make an outdoor shower more comfortable at a campsite, cabin, RV, or backyard wash area. The best fit depends on how much hot water you need, what water pressure your setup can provide, and whether portability matters more than flow rate. The five options below range from compact 1.32 GPM units for simple off-grid showers to a higher-flow model for more demanding use. Check the manufacturer’s instructions and local requirements before installation, and operate an outdoor propane heater only in a properly ventilated outdoor area.
Table of Contents
Quick Comparison
| Product | Listed flow | Best for | Notable detail |
|---|---|---|---|
| CAMPLUX 5L Portable Tankless Water Heater | 1.32 GPM | Lightweight camping and off-grid use | Starts at 3.0 PSI; weighs 10 lb |
| Amzgachfktch 6L Outdoor Propane Tankless Water Heater | 1.58 GPM | Portable showers with a low-pressure water source | Starts at 2.5 PSI; weighs 12 lb |
| forimo 20L Tankless Propane Water Heater | 5.26 GPM | Higher-flow outdoor hot water | Digital display; listed size is 17.12 x 7.87 x 26.77 inches |
| CAMPLUX 2.64 GPM Propane Portable Gas Water Heater | 2.64 GPM | A portable setup needing more flow than a compact 5L unit | 68,000 BTU/hour; weighs 23 lb |
| CAMPLUX AY132B 5L Portable Water Heater | 1.32 GPM | Basic portable showering and water-saving use | On/off shower head and 3.0 PSI minimum starting pressure |
Our Picks: Best Tankless Water Heaters For Outdoor Shower reviews
1. CAMPLUX 5L: A Lightweight Pick for Camping and Off-Grid Showers
This compact propane heater is made for portable outdoor use, including camping, RV trips, and remote cabins. It weighs 10 pounds and has a folding handle, so it is easier to carry and store than the larger models in this group. Its listed output is 1.32 gallons per minute, which is suited to a simple shower rather than serving several hot-water fixtures at once.
The unit starts at a stated water pressure of 3.0 PSI and uses two D batteries for ignition. That low-pressure start can be useful with a compatible small pump or gravity-fed water source, though the actual setup still needs to provide enough consistent flow for reliable operation. The package includes an on/off shower head, a gas regulator, and hoses. The product is CSA certified and lists protections for issues such as overheating and flame failure.
Its main trade-off is flow: the 1.32 GPM rating is lower than the other choices here. That can be a reasonable compromise for a solo shower or rinsing off outdoors, but it may feel limiting if you expect a strong, high-volume shower. As with any portable propane heater, follow the supplied installation and safety instructions, and check for gas leaks before use.
Pros:
- Lightweight 10-pound design with a folding handle
- Listed to start at 3.0 PSI
- Includes a shower head, gas regulator, and hoses
- CSA certified with multiple listed safety protections
Cons:
- Lower listed flow than the other models in this comparison
- Requires a propane supply and two D batteries for ignition
Verdict: Choose this CAMPLUX if low weight and off-grid portability matter more to you than higher shower flow.
2. Amzgachfktch 6L: A Portable Option for Lower-Pressure Water Sources
This 6L portable propane heater offers a listed flow of 1.58 GPM and a maximum output of 40,000 BTU per hour. At 12 pounds, it remains manageable to move, and its foldable handle is intended to make carrying and storage easier. The package includes an on/off shower head, gas regulator, garden hose adapter, and installation hardware.
A key point is its stated minimum starting pressure of 2.5 PSI, lower than the 3.0 PSI requirement listed for the two compact CAMPLUX models here. That may make it worth considering for a low-pressure supply, but the listing cautions that pressure below the minimum can prevent startup or cause temperature changes. Check your pump or water source rather than assuming that any gravity-fed setup will work.
The heater uses two D-cell batteries for electronic ignition and is designed to connect to a standard 20-pound liquid propane tank. It lists several safety protections, including flame-failure and overheating protection, and a CSA-approved regulator. The listing warns against using Teflon tape between the gas regulator and gas inlet; follow the product instructions for making gas connections and leak checks.
Pros:
- Lower stated starting pressure of 2.5 PSI
- Listed 1.58 GPM flow is higher than the 1.32 GPM compact options
- Foldable handle and 12-pound weight support portable use
- Includes a shower head, regulator, hose adapter, and hardware
Cons:
- Listed flow is still modest compared with the higher-output options
- Temperature stability depends on maintaining adequate water pressure and flow
Verdict: This is a practical choice if you want a portable heater with a relatively low stated startup-pressure requirement and a little more listed flow than a 1.32 GPM unit.
3. forimo 20L: The Highest Listed Flow for More Demanding Outdoor Use
With a listed output of 5.26 GPM and 68,000 BTU per hour, this forimo model has the highest flow rating among the five options. Its higher stated capacity may suit an outdoor shower setup where a smaller portable heater’s flow would be restrictive. It is designed for propane use and lists a minimum water pressure of 3.6 PSI.
This model is larger than the compact camping units: its listed dimensions are 17.12 by 7.87 by 26.77 inches. It uses two D-cell batteries and comes with a regulator, a shower head with multiple spray modes, a stainless-steel hose, and a shower holder. A digital display is included in the product title, but the supplied details do not specify its display functions, so check the manufacturer’s information if you need particular controls or readouts.
The higher flow rating comes with practical setup considerations. You will need a water source that can meet the stated pressure requirement, along with a suitable propane supply and a secure outdoor mounting location. The listing describes flame-failure, anti-freezing, and overheating protection, but it also advises checking for gas leaks before operation. Its larger size makes it less convenient to carry than the 10- and 12-pound options.
Pros:
- Highest listed flow in this comparison at 5.26 GPM
- Includes a multi-mode shower head and extended stainless-steel hose
- Lists flame-failure, anti-freezing, and overheating protections
- Suitable to consider when a compact heater’s flow may be too limited
Cons:
- Larger listed dimensions make it less convenient for frequent carrying
- Requires at least 3.6 PSI of water pressure to operate as specified
Verdict: Pick the forimo if the highest listed flow is your priority and your water source can meet its pressure requirement; choose a smaller unit if easy transport matters more.
4. CAMPLUX 2.64 GPM: A Middle Ground Between Portability and Flow
This CAMPLUX model lists 2.64 GPM of hot water and a maximum output of 68,000 BTU per hour. That puts it above the small 1.32 and 1.58 GPM heaters in listed flow, while keeping it below the forimo model’s 5.26 GPM rating. For an outdoor shower, it is a useful middle-ground option if you want more flow than a compact camping heater offers.
At 23 pounds, it is notably heavier than the other portable models in this lineup. The product has a mounting bracket and is described as taking about 15 minutes to install. It lists a water-pressure operating range of 3.6 to 110 PSI, along with an anti-freezing drain plug that can release residual water when the heater is not in use. Its listed protections include flame-failure, overheating, and anti-freezing features.
The higher flow does not remove the need to match the heater to your water supply and shower setup. Water temperature and usable flow can depend on the incoming water and operating conditions, so treat the listed GPM as a specification rather than a guarantee of a particular shower feel. The product instructions also warn against putting Teflon tape between the regulator and gas inlet; use the specified connection method and check for leaks before use.
Pros:
- Listed 2.64 GPM flow offers a middle ground among these choices
- 68,000 BTU/hour maximum output
- Includes an anti-freezing drain plug and multiple listed safety protections
- Mounting bracket supports a more fixed outdoor installation
Cons:
- At 23 pounds, it is heavier than the other portable models here
- Requires at least 3.6 PSI of water pressure to operate as specified
Verdict: Choose this CAMPLUX if you want more listed flow than the compact camping units and can accept a heavier, more installation-focused design.
5. CAMPLUX AY132B: A Simple 5L Heater with an On/Off Shower Head
The AY132B is a 5L portable propane heater rated at 1.32 GPM. Its 10-pound weight and folding handle make it easy to move between a campsite, RV, or other outdoor wash area. It is a straightforward match for a personal shower or rinse-off station, rather than a high-flow setup.
The included on/off shower head lets you pause the water while soaping up, which can help conserve water when your supply is limited. The heater is listed to start at 3.0 PSI and uses two D-size batteries. Its package includes a gas regulator, a US-standard garden hose, and installation hardware. The product is CSA approved and lists protections for low water flow, dry combustion, high water pressure, overheating, freezing, and flame failure.
This model is closely related in size and listed flow to the other CAMPLUX 5L option in this guide. Its clear appeal is the water-saving shower-head control and included hardware. Its main limit is the same modest 1.32 GPM rating, so it is not the best choice if you want a stronger or higher-volume shower. The listing also includes a one-year guarantee; confirm the terms and setup instructions before buying.
Pros:
- Portable 10-pound design with a folding handle
- On/off shower head can help reduce water use between rinses
- Includes a regulator, garden hose, and installation hardware
- CSA approved with multiple listed safety protections
Cons:
- Listed flow is limited to 1.32 GPM
- Needs at least 3.0 PSI of water pressure and two D batteries
Verdict: The AY132B is a sensible pick for a portable, water-conscious shower setup if its 1.32 GPM flow suits your needs.
How to Choose a Tankless Water Heater for an Outdoor Shower
Match the listed flow to how you plan to shower
Flow rate, measured in gallons per minute, gives you a starting point for comparing models. The options here range from 1.32 GPM to 5.26 GPM. A lower-flow unit may be enough for one person taking a simple outdoor shower, while a higher listed flow may be preferable if you want a more substantial stream. The stated number alone cannot promise a particular shower temperature or feel, since the incoming water temperature and your setup also matter.
Check your water pressure before you buy
Each heater needs enough water pressure to start and operate. The minimums in this group range from 2.5 PSI to 3.6 PSI. This is especially important if you use a small pump, gravity-fed container, or remote water source. Confirm that your source can meet the heater’s stated requirement consistently; inadequate pressure can prevent startup or lead to uneven operation.
Plan for propane and ignition power
These models use propane, and several specify two D-cell batteries for ignition. Consider where the propane tank will sit, how the regulator will connect, and whether you have spare batteries available. Follow the heater’s instructions for gas connections and leak checks. Do not assume that a hose or connection method is compatible unless the product documentation confirms it.
Think about portability versus a more fixed setup
If you will pack the heater for trips, weight and size matter. The compact choices here weigh 10 to 12 pounds, while the 2.64 GPM CAMPLUX weighs 23 pounds. A heavier model may make more sense for a regular outdoor shower location than for frequent carrying. Also consider how and where you can mount or hang the unit securely according to its instructions.
Look at included shower parts and controls
A bundled shower head, hose, regulator, and hardware can make setup more convenient, but check what is actually included with the model you choose. An on/off shower head can be useful when you want to pause the flow while soaping up. If a specific hose length, spray setting, or mounting part matters to you, confirm that detail in the product information before ordering.
Understand outdoor safety and cold-weather limits
Use an outdoor propane heater only outdoors in a properly ventilated area, and follow the manufacturer’s clearance, mounting, and operating instructions. Check gas connections for leaks before operation. Some models list anti-freezing protection or a drain plug, but those features do not mean every installation can be left outdoors in freezing conditions. Follow the unit’s instructions for draining, storage, and cold-weather use.
Frequently Asked Questions
Can a portable tankless propane heater be used for an outdoor shower?
Yes. The models in this guide are described for outdoor uses such as camping, RV trips, cabins, or portable showers. Set up and operate the heater according to its instructions, and keep it in a properly ventilated outdoor location.
How much water pressure does an outdoor tankless heater need?
It depends on the model. The products listed here specify minimum starting pressures from 2.5 PSI to 3.6 PSI. Check the exact requirement for your chosen heater and make sure your pump or water supply can meet it.
Is a higher GPM rating always better for an outdoor shower?
Not always. A higher listed flow may suit you if you want more water volume, but it may require a stronger water supply and a larger setup. A lower-flow heater can be easier to carry and may be adequate for a simple solo shower. Consider your water source and preferred shower style together.
Do these heaters need electricity?
The products listed use batteries for ignition rather than requiring a household electrical connection. The CAMPLUX 5L models and the forimo model specify two D-size batteries, and the Amzgachfktch model specifies two D-cell batteries. Check the product instructions for the exact battery type and operation details.
Can I install an outdoor propane heater inside an RV, shed, or bathroom?
These products are described as outdoor heaters. Do not use one in an enclosed space unless the manufacturer explicitly approves that installation and provides instructions for it. Follow all safety instructions and local requirements.
What is the best choice for a low-pressure water source?
Based on the stated minimums in the supplied product information, the Amzgachfktch 6L has the lowest listed startup requirement at 2.5 PSI. That does not guarantee it will work with every gravity-fed or pump setup, so verify that your system can provide stable pressure and flow.
Do anti-freezing features mean I can leave the heater outside in winter?
No. A listed anti-freezing feature or drain plug should not be treated as a guarantee that the heater can remain outdoors in freezing weather. Follow the manufacturer’s instructions for draining, storing, and protecting the unit in cold conditions.
Final Recommendation
For a lightweight camping or off-grid shower, the CAMPLUX 5L models are easy to shortlist, with the AY132B offering an on/off shower head that can help conserve water. Choose the Amzgachfktch 6L if its lower stated startup pressure is important to your water setup. If you want more listed flow, compare the 2.64 GPM CAMPLUX with the higher-flow forimo 20L, keeping their weight, size, and pressure requirements in mind. Before buying, verify that your water source, propane connection, and outdoor installation plan match the specific heater’s instructions.
