Portable tankless water heaters are small and light, so they deliver much less hot water than a whole-house unit. Even so, at around 1.3 to 2 GPM they provide enough hot water, at a steady pressure, for one shower or one fixture at a time.
Most portable propane heaters ignite with two D-cell batteries and start heating as soon as water begins to flow, so there is no electricity needed. They are available in propane gas and electric versions, and the best fit depends on where you will use them. Below we compare six portable propane water heaters for camping, RV trips, cabins, tiny homes and outdoor showers. Combine one with a portable outdoor shower for a complete setup.
| Product | Our Rating | ||
|---|---|---|---|
 |
Best overall
CAMPLUX 5L Portable Tankless Water Heater, 1.32 GPM Outdoor Propane Shower |
VIEW ON AMAZON | |
 |
Best certified
GASLAND BE158B Portable Propane Tankless Water Heater, CSA Certified, 6L 1.58 GPM |
VIEW ON AMAZON | |
 |
Best for outdoor use
CAMPLUX BD158C Portable Tankless Water Heater, 1.58 GPM, 41,000 BTU, with Rain Cap |
VIEW ON AMAZON | |
 |
Best flow rate
CAMPLUX Portable Tankless Water Heater, 55,000 BTU, 2.11 GPM Propane |
VIEW ON AMAZON | |
 |
Best value for flow
Ranein 8L Propane Tankless Water Heater, 2.11 GPM, 48,000 BTU, Outdoor |
VIEW ON AMAZON | |
 |
Best off-grid kit
CAMPLUX Portable Propane Water Heater and 12V Pump Kit, 1.32 GPM Gas Shower System |
VIEW ON AMAZON |
Best Portable Tankless Water Heater Reviews in 2026
Best Compact Portable Tankless Water Heaters
1. CAMPLUX 5L Portable Tankless Water Heater, 1.32 GPM Outdoor Propane Shower
The CAMPLUX 5L is a compact propane water heater that weighs only about 10 pounds and has a folding handle, which makes it easy to take to a campsite, an RV or a fishing trip. It delivers 1.32 gallons a minute of instant hot water and keeps the temperature stable for a comfortable outdoor shower.
- 1.32 GPM, runs on propane
- About 10 pounds with a folding handle
- Instant hot water, no waiting
- For camping, RV and off-grid use
- Very light and easy to carry
- Instant hot water from a standard propane cylinder
- Very popular, with a large number of satisfied owners
- Low price for a name-brand portable heater
- Flow is only enough for one shower at a time
- Needs a propane tank and a water source, so it is for outdoor use only
Our Verdict: Our top pick: a light, proven and affordable portable heater from the best-known brand in the category.
2. GASLAND BE158B Portable Propane Tankless Water Heater, CSA Certified, 6L 1.58 GPM
The GASLAND BE158B is a CSA-certified 6-liter propane heater with a maximum output of 41,000 BTU per hour and a flow rate of 1.58 GPM. It starts with only about 3.6 PSI of water pressure, runs from a standard 20 lb propane tank and has an electronic ignition powered by two D-cell batteries.
- 1.58 GPM, 41,000 BTU, CSA certified
- Starts with just 3.6 PSI of water pressure
- Runs on a 20 lb propane tank
- Electronic ignition on two D batteries
- CSA certification adds confidence on safety
- Low start-up pressure works with pumps and gravity feeds
- Higher flow than the smallest 5L models
- Used by a large number of buyers
- Still only a single-shower heater
- Slightly heavier and bulkier than the 5L CAMPLUX
Our Verdict: A safe, reliable heater with a bit more flow than the smallest portables.
3. CAMPLUX BD158C Portable Tankless Water Heater, 1.58 GPM, 41,000 BTU, with Rain Cap
The BD158C is a 13-pound outdoor propane heater that provides 1.58 gallons per minute from 41,000 BTU per hour and needs no preheating. A stainless steel rain cap protects the exhaust, and a carry handle makes it portable for camping, tiny homes, poolside use or washing pets.
- 1.58 GPM, 41,000 BTU per hour
- 3.54 inch stainless steel rain cap
- 13 pounds with a carry handle
- No preheating needed
- A step up in flow from the 5L model
- Rain cap protects the unit outdoors
- Works for tiny homes, poolside and pet washing too
- Reliable results with a well-known brand
- Costs more than the 5L CAMPLUX
- Not a replacement for a whole-house heater
Our Verdict: A good middle option when you want a bit more flow and weather protection.
Best High-Flow and Off-Grid Portable Water Heaters
4. CAMPLUX Portable Tankless Water Heater, 55,000 BTU, 2.11 GPM Propane
This CAMPLUX delivers 2.11 GPM of continuous hot water from 55,000 BTU per hour, which is the most flow of the portable models in this roundup. It runs on two D-cell batteries, ignites at only 3.0 PSI so it works with 12V pumps or gravity-fed systems, and sets up in minutes.
- 2.11 GPM, 55,000 BTU
- Battery-operated ignition (2 D cells)
- Ignites at just 3.0 PSI
- Folding handle and adapters included
- Highest flow in the portable group
- Works with low-pressure water sources and pumps
- No electrical hookup needed
- Quick setup without tools
- The largest and most expensive of the CAMPLUX portables
- Uses propane quickly at full output
Our Verdict: The best portable heater for stronger showers or a family at a campsite.
5. Ranein 8L Propane Tankless Water Heater, 2.11 GPM, 48,000 BTU, Outdoor
Ranein’s 8L heater delivers 2.11 GPM from 48,000 BTU, with a temperature rise of about 55 to 109 degrees F. It measures about 20.5 by 6.1 by 12.6 inches, weighs 13.3 pounds and runs on only 3.6 PSI, which suits low-pressure rural camping. An oxygen-free copper tank reduces heat loss, and a stainless steel shell resists corrosion.
- 2.11 GPM, 48,000 BTU, 8L
- Runs on 3.6 PSI of water pressure
- Oxygen-free copper tank and stainless steel shell
- 13.3 lbs, compact, outdoor use
- High flow in a compact, lightweight body
- Copper tank and stainless steel shell for durability
- Works at very low water pressure
- Priced below the largest CAMPLUX model
- Less known brand with a smaller number of owner reviews
- Needs propane and a standard regulator hose
Our Verdict: A strong, compact alternative if you want 2.11 GPM at a lower price.
6. CAMPLUX Portable Propane Water Heater and 12V Pump Kit, 1.32 GPM Gas Shower System
This CAMPLUX kit adds a 12V water pump to the AY132 heater, so you can draw water from a lake, a bucket or an RV tank without a pressurized tap. It includes long power cables of more than 25 feet and extension hoses, making it the easiest all-in-one off-grid shower solution.
- AY132 heater, 1.32 GPM, plus 12V water pump
- Draws water from a lake, bucket or tank
- Long power cables (25 ft+) and extension hoses
- Complete off-grid kit
- Everything you need for a shower without taps
- Pump gives steady water pressure from any source
- Long cables and hoses give flexibility in setup
- Same trusted brand as the other CAMPLUX models
- Needs a 12V power source for the pump
- More expensive and bulkier than the heater alone
Our Verdict: The best complete kit for off-grid camping, boondocking and RV life.
What to Know Before Buying a Portable Tankless Water Heater
- Flow rate. Portable units typically provide between 1.3 and 2.5 GPM. That is enough for one shower, but not for two outlets at the same time.
- Fuel. Most portable heaters run on propane, usually from a standard 20 lb tank. They produce exhaust, so they must be used outdoors or with proper ventilation, and cannot be used indoors unless approved for it. If you want a completely green option, look at electric models.
- Water pressure. Check the minimum pressure the heater needs. Models with a low start-up pressure (about 3 to 3.6 PSI) work with 12V pumps and gravity-fed systems.
- Weight and handle. If you plan to carry the heater, a light unit with a folding handle is a big advantage.
- Power. Most use two D batteries for ignition, so carry spares.
- Safety. Look for CSA or similar safety certification, and never use a propane heater inside a tent or an enclosed space.
How Much Do Portable Tankless Water Heaters Cost?
Portable heaters range from about $70 to $350. Budget models of around $70 to $120 provide 1.3 to 1.8 GPM, but their build is average and can have shorter warranties. Mid-range models of roughly $150 to $250 offer 1.8 to 2.5 GPM, better build quality and often a longer warranty. The high end of the range offers the best build, higher flow rates and extras such as freeze protection.
Portable tankless heaters are your best bet for hot water on a trip or vacation, and are ideal for RVs and vacation cottages. For a permanent heater, see our electric and gas tankless water heater reviews.
