Best Tankless Water Heaters with 68,000 BTU: 8 Spec-Based Picks
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Finding the best tankless water heaters with 68000 btu requires matching heating capacity to your specific flow needs. We compared 8 models based strictly on the specifications published on their listings. The APUS 68,000 BTU RV Propane Water Heater leads because it supports standard camper compartment cutouts while delivering high flow and elevation support. This guide helps you decide which unit fits your installation space and power source.
Quick picks
The best fit for you
- You need high flow and elevation support for RV travel APUS 68,000 BTU RV Propane Water Heater It delivers 3.9 GPM flow and supports high-altitude operation for standard camper compartments.
- You want the most compact model on the list Camplux CX264WNG Natural Gas Indoor Heater Its 5.9-inch width and 13.7-inch height make it the smallest unit by footprint.
- You need digital temperature control for indoor multi-fixture use Forimo 18L Indoor Propane Tankless Heater It features an LED digital display and offers a high 4.74 GPM flow rate.
Our 8 picks
APUS 68,000 BTU RV Propane Water Heater
Best for: high-altitude RV travel and cold-weather camping
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 3.9 GPM
- Voltage
- 12V DC
- Certification
- CSA
- Dimensions
- 14.96 x 14.96 x 14.18 inches
If you need high-volume water heating in an RV, this 68,000 BTU propane unit provides up to 3.9 GPM on a 12V DC electrical connection. It features an included remote control, staged combustion for 95–124°F temperatures, and high-altitude operation up to 9,800 feet. Sized for 12.6 by 12.6-inch cutouts, it suits campers, trailers, and motorhomes requiring freeze protection down to 35.6°F.
Pros
- Delivers up to 3.9 GPM with a 0.55 GPM activation threshold
- Operates at elevations up to 9,800 feet
- Includes remote control for interior temperature adjustments
- Built-in freeze protection triggers automatically at 35.6°F
Cons
- Requires a 12V DC power connection to operate
- Maximum water temperature tops out at 124°F
Good fit if
- You need a 12V DC propane water heater for an RV or camper.
- You travel at elevations up to 9,800 feet.
- You want up to 3.9 GPM flow from a 68,000 BTU RV unit.
Skip if
- You do not have a dedicated 12V DC electrical supply.
- You require water temperatures exceeding 124°F.
Verdict: APUS 3.9 GPM RV Propane Tankless Water Heater delivers high flow and elevation support for standard camper compartment cutouts. It is a capable choice when you need remote temperature management and freeze protection on 12V DC power.
Camplux 2.64 GPM Portable Propane Water Heater
Best for: portable off-grid and campsite outdoor showers
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 2.64 GPM
- Installation Location
- Outdoor
- Dimensions
- 21.7 x 13 x 6.1 inches
- Use
- Camping
View on Amazon: Camplux 2.64 GPM Portable Propane Water Heater
This Camplux tankless water heater delivers up to 2.64 GPM of hot water powered by a 68,000 BTU propane burner. Built strictly for outdoor setups like campsites, cabins, or off-grid showers, it weighs 21 pounds and activates at water pressures as low as 3.6 PSI. If you need portable, medium-flow water heating that operates on low-pressure supply lines outside your home, this unit matches your requirements.
Pros
- Operates on water pressures ranging from 3.6 to 110 PSI
- Delivers 2.64 GPM flow rate using a 68,000 BTU/hr propane burner
- Gas supply shuts off automatically if water temperatures exceed 167 °F
- Includes anti-freezing drain plug to discharge residual water
Cons
- Rated strictly for outdoor installation rather than indoor use
- Operates only on liquid propane with no natural gas option
Good fit if
- You need a portable water heater for outdoor camping, RV, or off-grid wash stations.
- You run a low-pressure water source between 3.6 and 110 PSI.
Skip if
- You need an indoor-installed water heating unit.
- You require a natural gas connection rather than liquid propane tanks.
Verdict: Camplux 2.64 GPM Portable Outdoor Propane Water Heater provides steady 68,000 BTU heating capacity for off-grid outdoor locations. Its low 3.6 PSI activation threshold and built-in safety shutoffs make it a practical choice for remote water setups.
Ranein 12L Outdoor Propane Tankless Water Heater
Best for: outdoor campsites and low-pressure cabin setups
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 3.18 GPM
- Installation Location
- Outdoor
- Temperature Control
- 55°F–109°F
- Dimensions
- 21.7" x 7.1" x 13"
View on Amazon: Ranein 12L Outdoor Propane Tankless Water Heater
This Ranein tankless water heater delivers up to 3.18 GPM using liquid propane and a 68,000 BTU heating capacity. Designed strictly for outdoor use, it weighs 18 pounds and activates at water pressures as low as 3.6 PSI. The unit outputs temperatures between 55°F and 109°F. If you need portable, medium-flow hot water for cabins, campsites, or outdoor washing setups, this compact unit fits those demands.
Pros
- Delivers 3.18 GPM flow rate powered by 68,000 BTU
- Operates at a low starting water pressure of 3.6 PSI
- Portable 18-pound build with oxygen-free copper heat exchanger
- Backed by a 2-year warranty
Cons
- Restricted to outdoor installation only
- Maximum hot water temperature reaches 109°F
Good fit if
- You need 3.18 GPM for outdoor sites, cabins, or campsites
- You operate with low water supply pressure down to 3.6 PSI
Skip if
- You need an indoor installation in a kitchen, bathroom, or basement
- You require water heated higher than 109°F
Verdict: Ranein 12L Outdoor Propane Tankless Water Heater provides reliable 3.18 GPM flow and low-pressure ignition for outdoor setups, though its 109°F maximum temperature limits high-heat applications.
Camplux 2.64 GPM Portable Propane Water Heater
Best for: portable outdoor camping and off-grid cabin showers
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 2.64 GPM
- Installation Location
- Outdoor
- Temperature Control
- 50°F~122°F
- Certification
- CSA
View on Amazon: Camplux 2.64 GPM Portable Propane Water Heater
This portable outdoor water heater delivers up to 2.64 GPM of hot water using a 68,000 BTU propane burner. At 18 pounds, it is easy to carry for camping, cabins, or road trips. You get mechanical knob controls for water and gas flow, producing a temperature rise between 50°F and 122°F. It operates on water pressure from 3.6 to 110 PSI using two D batteries for ignition.
Pros
- Outputs 2.64 GPM with a 68,000 BTU burner
- Lightweight 18-pound frame designed for portability
- Activates at low water pressure down to 3.6 PSI
- Includes 5-foot gas regulator and shower head kit
Cons
- Rated for outdoor installation only
- Requires two D batteries and a separate water inlet hose
- Needs an external water pump when supplied by low-pressure tanks
Good fit if
- You need a lightweight 68,000 BTU heater for off-grid cabins or campsites.
- You have low water pressure starting at 3.6 PSI.
- You want an included regulator and quick-connect shower kit.
Skip if
- You need a water heater rated for indoor installation.
- You require flow rates greater than 2.64 GPM for multiple fixtures.
Verdict: Camplux 2.64 GPM Portable Outdoor Propane Water Heater provides an 18-pound outdoor heating solution for off-grid wash stations. Its 68,000 BTU heating capacity and 3.6 PSI activation make it dependable for remote setups.
Camplux CX264WNG Natural Gas Indoor Heater
Best for: small indoor spaces needing stable heat
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Natural Gas
- Flow Rate
- 2.64 GPM
- Installation Location
- Indoor
- Voltage
- 120V
- Temperature Control
- ±1°F
This Camplux unit delivers 68,000 BTU of natural gas power for indoor use. It provides 2.64 GPM of flow, suitable for one or two fixtures. The design includes ±1℉ temperature control and anti-freeze protection below 39°F. Weighing 19.1 pounds, it fits small spaces like apartments or tiny homes. You get a 96.9% efficient copper heat exchanger for rapid heating.
Pros
- 68,000 BTU natural gas input
- 2.64 GPM flow rate
- ±1℉ precise temperature control
- Anti-freeze protection activates below 39°F
- 96.9% thermal efficiency
Cons
- Lower 2.64 GPM flow rate limits simultaneous use
- Indoor installation only
- Requires specific 3-inch vent pipe
Good fit if
- You need a compact unit for a tiny house or apartment
- You require precise temperature stability within ±1℉
- You want anti-freeze protection for cold climates
Skip if
- You need high flow for multiple showers
- You require outdoor installation
- You prefer propane fuel source
Verdict: Camplux CX264WNG Natural Gas 2.64 GPM offers precise heat control for small indoor spaces. It suits users who prioritize temperature stability and anti-freeze features over high flow volume.
Flame King 2.64 GPM Portable Propane Water Heater
Best for: portable outdoor showers and off-grid camping use
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 2.64 GPM
- Installation Location
- Outdoor
- Certification
- CSA
- Dimensions
- 21.5 x 7 x 13 inches
View on Amazon: Flame King 2.64 GPM Portable Propane Water Heater
This portable propane unit delivers up to 2.64 GPM at 68,000 BTU for outdoor setups. Built in a steel casing weighing 18 pounds, it includes manual knobs for water flow, gas intensity, and seasonal temperature shifts, alongside a digital display. If you need portable hot water for camping, cabins, or washing gear under shelter, this compact heater provides direct connection to standard barbecue propane tanks with its included regulator hose.
Pros
- Delivers 2.64 GPM at 68,000 BTU using liquid propane
- Includes CSA-certified regulator, 5-foot tank hose, and shower head
- Features a digital water temperature meter and adjustable gas and water knobs
- Weighs 18 pounds with a durable steel casing
Cons
- Requires an awning or protective cover to shield the top vent from rain
- Outdoor installation only; not rated for indoor mounting
Good fit if
- You need an outdoor, portable propane water heater for camping, RVs, or cabins.
- You want an included regulator hose compatible with standard barbecue propane tanks.
- You prefer manual dial controls for winter and summer heating adjustments.
Skip if
- You plan to mount the unit indoors.
- You cannot provide an overhead cover or awning to protect against rain.
Verdict: Flame King 2.64 GPM Portable Outdoor Propane Water Heater offers 68,000 BTU of portable heating power with included shower and tank hookups. It gives you straightforward temperature adjustment in an 18-pound outdoor build.
Camplux 2.64 GPM Indoor Propane Water Heater
Best for: small homes and cabins needing indoor venting
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Installation Location
- Indoor
- Flow Rate
- 2.64 GPM
- Dimensions
- 5.91 × 5.91 × 20.3 inches
- Weight
- 23.8 pounds
View on Amazon: Camplux 2.64 GPM Indoor Propane Water Heater
This indoor propane tankless water heater delivers up to 2.64 GPM of hot water using a 68,000 BTU burner. It connects to a 120V electrical outlet for electronic ignition and includes a 2-inch horizontal vent pipe for forced exhaust. You also get an Eco and Full switch to manage fuel usage. It suits small homes, cabins, or apartments with modest hot water demands.
Pros
- Supplies 2.64 GPM with a 68,000 BTU maximum input rating
- Includes a 2-inch horizontal vent pipe for power ventilation
- Features an Eco and Full gas switch to manage fuel consumption
- Displays water temperature in Fahrenheit on a digital screen
Cons
- Requires a separate regulator and adapter to hook up to a propane tank
- Requires a minimum water flow rate of 0.65 GPM to ignite
- Anti-freeze protection requires manual water drainage
Good fit if
- You need an indoor propane water heater for an apartment, cabin, or small home.
- You have a standard 120V electrical outlet near the installation location.
- You run plumbing fixtures that meet the 0.65 GPM activation threshold.
Skip if
- You need an outdoor unit that operates without indoor exhaust venting.
- You run low-flow fixtures under 0.65 GPM that will not trigger heating.
- You want an off-grid heater that functions without a 120V power connection.
Verdict: Camplux 2.64 GPM Indoor Propane Water Heater provides steady indoor heating at 68,000 BTU for living spaces with access to 120V power. Its included horizontal vent pipe and 2.64 GPM capacity make it a practical choice for compact residences.
Forimo 18L Indoor Propane Tankless Heater
Best for: multi-fixture indoor setups needing digital temperature control
- BTU
- 68,000 BTU (what this guide is about)
- Fuel Type
- Propane
- Flow Rate
- 4.74 GPM
- Installation Location
- Indoor
- Temperature Control
- 86°F-167°F
- Dimensions
- 25.4 x 14.4 x 14.4 inches
The Forimo 18L Indoor Propane Tankless Heater supplies up to 4.74 GPM using a 68,000 BTU propane burner. Its built-in LED digital display lets you set water temperatures between 86°F and 167°F. The unit activates with 3.6 PSI of water pressure and connects using 1/2-inch NPT fittings. It suits you if you need multi-fixture indoor hot water from a propane line.
Pros
- High 4.74 GPM flow rate rating
- LED digital screen with 86°F to 167°F temperature range
- Operates with low water pressure starting at 3.6 PSI
- Includes a 2.5-inch horizontal vent pipe
Cons
- Cabinet depth of 14.4 inches extends far off the wall
- Requires horizontal exhaust venting for indoor operation
- Restricted to liquid propane supply
Good fit if
- You run multiple indoor fixtures and need up to 4.74 GPM.
- You want precise temperature changes via an LED display.
- You deal with low water pressure down to 3.6 PSI.
Skip if
- You need a natural gas connection.
- You want an outdoor installation without indoor vent piping.
- You have tight wall clearance that cannot fit 14.4 inches of depth.
Verdict: Forimo 18L Indoor Propane Tankless Heater pairs a clear LED digital control screen with a high 4.74 GPM flow rate for indoor propane setups.
Specifications side by side
| Spec | APUS 68,000 BTU RV Propane Water Heater | Camplux 2.64 GPM Portable Propane Water Heater | Ranein 12L Outdoor Propane Tankless Water Heater | Camplux 2.64 GPM Portable Propane Water Heater | Camplux CX264WNG Natural Gas Indoor Heater | Flame King 2.64 GPM Portable Propane Water Heater | Camplux 2.64 GPM Indoor Propane Water Heater | Forimo 18L Indoor Propane Tankless Heater |
|---|---|---|---|---|---|---|---|---|
| Fuel Type | Propane | Propane | Propane | Propane | Natural Gas | Propane | not specified | Propane |
| Flow Rate | 3.9 GPM | 2.64 GPM | 3.18 GPM | 2.64 GPM | 2.64 GPM | 2.64 GPM | not specified | 4.74 GPM |
| BTU | 68,000 BTU | 68,000 BTU/hr | 68,000 BTU | 68,000 BTU | 68,000 BTU | 68,000 BTU/hr | not specified | 68,000 BTU/hr |
| Installation Location | not specified | Outdoor | Outdoor | Outdoor | Indoor | Outdoor | not specified | Indoor |
| Voltage | 12V DC | not specified | not specified | not specified | 120V | not specified | not specified | not specified |
| Temperature Control | not specified | not specified | 55°F–109°F | 50°F~122°F | ±1°F | not specified | not specified | 86°F-167°F |
| Certification | CSA | not specified | not specified | CSA | not specified | CSA | not specified | not specified |
| Dimensions | 14.96 x 14.96 x 14.18 inches | 21.7 x 13 x 6.1 inches | 21.7" x 7.1" x 13" | 21.7 x 13 x 7.1 inches | 13.7 x 5.9 x 5.9 inches | 21.5 x 7 x 13 inches | not specified | 25.4 x 14.4 x 14.4 inches |
| Use | RV | Camping | Camping, Cabins | Camping, Cabins | not specified | Camping, RV, Cabins | not specified | not specified |
| Features | not specified | not specified | not specified | Overheat Protection | not specified | not specified | not specified | Digital Display |
| Weight | 24 pounds | 21 pounds | 18 pounds | 18 pounds | 19.1 pounds | 18 pounds | 23.8 pounds | not specified |
| Color | White | Gray | Gray | White | White | White | Black | Black |
| Model | AP-AWH-RV10W-NEW | BW264G | TMYD-01020120 | BD264 | CX264WNG | YSNBM264a | CM264 | HWRSQ-18L-LPG-2 |
| Size | not specified | 21.7*13*6.1 | not specified | 13(L) x 7.1(W) x 21.7(H) inches | not specified | 10L - 2.64 GPM | 10L | not specified |
Is 68,000 BTU worth it for your setup?
This heating capacity delivers consistent hot water for single-fixture use. You get steady flow rates between 2.64 and 3.9 GPM across propane and natural gas models. The 68,000 BTU output supports outdoor camping, RV travel, and small indoor spaces. It handles low-pressure ignition and freeze protection features. Higher flow units like the Forimo 18L reach 4.74 GPM. This level of power ensures reliable temperature stability for showers and wash stations without excessive fuel consumption.
Worth it if
- You need reliable hot water for RV travel or outdoor camping
- You want stable temperature control for small indoor spaces
- You require low-pressure ignition for remote water setups
Skip it if
- You need to run multiple fixtures simultaneously
- You require high-volume flow for whole-house use
- You prefer electric heating for indoor installations
If you also evaluate outdoor space heating, compare output specifications for the best 48000 btu patio heaters.
How We Selected These Units
We found these 8 models by scanning Amazon listings for the specific 68,000 BTU heating capacity. This figure indicates the energy output, which directly affects how quickly you can heat water. We only included units where the manufacturer explicitly stated this BTU rating in the title or feature list. We did not test the hardware ourselves. All details come strictly from the published specifications on each product page.
The list is ordered by availability first, then by overall rating weighted by review count, and finally by how many of our criteria each spec meets. This method ensures you see the most relevant options first. We present one size or variant per product family to keep the guide focused. Prices and stock levels are shown live on the page.
How to choose the right one
-
Match fuel to your source
Propane units like the APUS and Camplux models work well for RVs and outdoor camping where gas lines are unavailable. Natural gas options, such as the Camplux CX264WNG, are better for small indoor spaces with existing gas lines. Check your available fuel source first. Propane offers portability, while natural gas provides a continuous supply for fixed installations. Ensure your fuel type matches the heater’s design to avoid compatibility issues.
-
Check flow rate needs
Flow rate determines how much hot water you get at once. The APUS model delivers 3.9 GPM, which suits high-demand RV setups. Most other units provide 2.64 GPM or 3.18 GPM, which is sufficient for single-fixture use like a shower or sink. If you need to run multiple fixtures, look for higher GPM ratings. Lower flow rates mean less water heated simultaneously. Choose a unit that meets your peak usage requirements without wasting energy on unused capacity.
-
Verify installation location
Installation location dictates venting and safety requirements. Outdoor units like the Ranein and Camplux BW264G are designed for exposure to the elements. Indoor models, such as the Forimo and Camplux CM264, require proper venting to exhaust combustion gases. Always check the manufacturer’s specifications for indoor or outdoor use. Placing an indoor unit outside can damage components and void warranties. Ensure your chosen spot matches the heater’s intended environment for safe and efficient operation.
-
Consider power requirements
Some tankless heaters require external power for ignition and controls. The APUS RV model runs on 12V DC power, making it ideal for camper electrical systems. Other units may need standard 120V power for indoor venting fans or digital displays. Check the voltage requirements before purchasing. If you are off-grid, ensure you have a compatible power source. Matching your power setup to the heater prevents operational failures and ensures reliable hot water delivery when you need it most.
-
Check dimensions and weight
Space constraints matter, especially in RVs or small cabins. The APUS unit measures 14.2 by 14.2 inches, fitting standard camper compartments. The Camplux CX264WNG is compact at 5.9 inches wide, saving wall space. Weight also matters for portable units; the Ranein is the lightest at 18 pounds. Measure your installation area before buying. Ensure the unit fits physically and that you can support its weight if mounted. Proper sizing ensures a secure and stable installation without modifications.
Frequently asked questions
Can a 68,000 BTU tankless heater run an RV shower?
Yes, it can. The APUS model delivers 3.9 GPM, which is sufficient for most RV showers. It also supports high-altitude operation, making it reliable for travel in varied elevations. This capacity ensures consistent hot water flow even when moving between different camping sites.
Which 68,000 BTU unit is best for indoor installation?
The Forimo 18L Indoor Propane Tankless Heater is designed for indoor use. It features a digital display for precise temperature control. It also offers a high flow rate of 4.74 GPM, making it suitable for multi-fixture setups inside small homes or cabins where ventilation is managed.
Do these heaters require electricity to operate?
Most propane models use electricity for ignition and controls. The APUS unit runs on 12V DC power, ideal for RVs. The Camplux indoor propane model requires 120V power for its internal systems. Natural gas models like the Camplux CX264WNG also need electricity for stable operation and anti-freeze features.
What is the smallest 68,000 BTU water heater available?
The Camplux CX264WNG Natural Gas Indoor Heater is the most compact. It measures 5.9 inches in width and 13.7 inches in height. This small footprint makes it suitable for tight indoor spaces. It weighs 19.1 pounds and provides 2.64 GPM flow for small residential needs.
Can I use a 68,000 BTU heater for camping showers?
Yes, several models are built for outdoor camping. The Camplux BW264G and Flame King YSNBM264a are portable propane units. They activate at low water pressure, which is helpful for remote setups. Both weigh under 22 pounds, making them easy to transport to campsite locations.
How much hot water can a 68,000 BTU unit produce?
Flow rates range from 2.64 to 4.74 GPM. The Forimo model offers the highest flow at 4.74 GPM. The APUS RV model provides 3.9 GPM. Most portable units deliver 2.64 GPM. This output supports single-fixture use, such as a shower or sink, without interruption.
Are there natural gas options with 68,000 BTU?
Yes, the Camplux CX264WNG uses natural gas. It is designed for indoor installation in small spaces. It offers precise heat control and anti-freeze features. This unit provides 2.64 GPM of flow, making it a practical choice for users who prefer natural gas over propane for indoor heating.
What safety features do these 68,000 BTU heaters have?
Many units include overheat protection and safety shutoffs. The Camplux BW264G and BD264 models feature built-in safety shutoffs. The Camplux CX264WNG includes anti-freeze features for indoor use. These mechanisms help prevent damage and ensure safe operation during outdoor camping or indoor residential use.