APUS or VELPAX? Tankless Water Heaters Compared in 2026
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This APUS vs VELPAX tankless water heater comparison helps you choose the right propane unit for your needs. Both models deliver 68,000 BTU of heat and offer on-demand hot water. The main difference lies in their intended use and flow capacity. APUS is built specifically for RV compartments with a compact footprint. VELPAX is designed for indoor residential or cabin use with a higher flow rate. You need to decide which installation environment fits your situation.
Key differences
| Aspect | APUS 68,000 BTU RV Propane Water Heater | VELPAX 4.74 GPM Indoor Propane Water Heater |
|---|---|---|
| Flow Rate | 3.9 GPM | 4.74 GPM |
| Installation Location | RV | Indoor |
| Dimensions | 14.96 x 14.96 x 14.18 inches | 21.7 x 13.8 x 13.8 inches |
| Voltage | 12V DC | not listed |
| Temperature Control | 95–124°F | 95–149°F |
Which one should you choose?
Choose APUS 68,000 BTU RV Propane Water Heater if
- You need a unit that fits standard RV water heater openings.
- You require 12V DC power compatibility for mobile living.
- You want automatic freeze protection that activates at 35.6°F.
Choose VELPAX 4.74 GPM Indoor Propane Water Heater if
- You need higher flow for multiple simultaneous indoor fixtures.
- You are installing in a home, cabin, or apartment.
- You prefer a stainless steel body with an LED digital display.
Verdict: Choose the APUS if you are equipping an RV and need a compact, 12V DC unit with specific RV certifications. Choose the VELPAX if you are installing indoors in a residence or cabin and want higher flow capacity with a digital interface. Both provide reliable propane heating for their respective environments.
APUS vs VELPAX Propane Comparison
Flow Rate
The VELPAX unit delivers a higher maximum flow rate of 4.74 GPM compared to the APUS model, which provides 3.9 GPM. This difference matters when you need hot water for multiple fixtures or longer showers. The VELPAX can support two to three points of use simultaneously, making it suitable for busy bathrooms or kitchens. The APUS starts flowing at just 0.55 GPM, ensuring ignition even with low water pressure. However, its lower peak output means you might need to reduce flow to maintain temperature during heavy use. If your priority is volume, the VELPAX has the advantage.
Installation Location
These heaters are designed for different environments. The APUS is built for RVs and outdoor use, featuring a compact design that fits standard RV water heater compartments. It includes intelligent freeze protection that activates at 35.6°F to prevent damage in cold weather. The VELPAX is rated for indoor installation only. It requires proper ventilation and a smoke exhaust pipe, along with a 2.5-inch horizontal vent pipe included in the package. Using the VELPAX outdoors could void safety certifications or cause damage. Choose the APUS for mobile or exterior setups, and the VELPAX for fixed indoor spaces.
Power Source
The APUS operates on 12V DC power, which is standard for most recreational vehicles and campers. This allows you to run the unit directly from your RV battery system or a 12V converter. The VELPAX specifications do not list a specific voltage requirement in the provided data, though it likely requires standard household electricity for its digital display and controls. If you are powering your water heater from a 12V DC system in a camper or off-grid cabin, the APUS is the compatible choice. For a standard home with AC power, the VELPAX fits better.
Safety Certifications
Both units include essential safety features like flame failure protection, anti-freeze measures, and over-temperature protection. The APUS holds CSA Certification, which is crucial for RV and mobile applications, ensuring it meets specific standards for propane use in tight spaces. It also includes a 203 PSI pressure relief valve and gas leak protection. The VELPAX lists multiple safety protections but does not explicitly mention CSA or other specific certification marks in the provided data. The APUS provides verified certification for RV compliance, giving it an edge for mobile or certified installations.
Control Interface
The APUS includes a remote control, allowing you to adjust the temperature from inside your RV or cabin without accessing the unit itself. This is convenient for RVs where the heater is mounted in a tight compartment. The VELPAX features an LED smart digital display on the unit, letting you set temperatures between 95°F and 149°F directly on the device. Both interfaces offer precise control, but the remote adds convenience for hard-to-reach installations. The digital display provides clear feedback on the VELPAX. Neither interface is clearly superior without knowing your installation constraints.
APUS or VELPAX: Which Suits You
RV owners needing compact, mountable units
The APUS fits standard RV compartments with a 14.96-inch square footprint. It runs on 12V DC power and includes a remote control for easy adjustment. Its design replaces 6 to 12-gallon tanks, saving space while providing 3.9 GPM. This model is built for mobile living and mountain travel up to 9,800 feet.
Indoor users wanting higher flow rates
The VELPAX delivers 4.74 GPM, which is higher than the APUS. It features a stainless steel body and copper tank for durability. The LED display allows precise temperature control between 95°F and 149°F. This unit is designed for indoor installation in homes or cabins, offering steady temperature control for multiple fixtures.
Campers prioritizing freeze protection and safety
APUS includes intelligent freeze protection that activates at 35.6°F. It holds CSA certification and offers flame failure, gas leak, and over-temperature protections. The unit maintains stable performance at high elevations. These safety features and automatic protections make it a reliable choice for cold-weather camping and variable outdoor conditions.
The products compared
APUS 68,000 BTU RV Propane Water Heater
Best for: Standard RV tank replacement with remote control
- Fuel Type
- Propane
- Flow Rate
- 3.9 GPM
- BTU
- 68,000 BTU
- Voltage
- 12V DC
- Certification
- CSA
- Dimensions
- 14.96 x 14.96 x 14.18 inches
View on Amazon: APUS 68,000 BTU RV Propane Water Heater Affiliate link
This APUS tankless water heater delivers 68,000 BTU of propane power for on-demand hot water. It flows up to 3.9 GPM and starts with just 0.55 GPM. The compact 14.96 x 14.96 x 14.18-inch design fits standard RV compartments. It includes a remote control and operates on 12V DC power. CSA certification ensures safety during your travels.
Pros
- 68,000 BTU propane burner for continuous hot water
- 3.9 GPM flow rate with 0.55 GPM start-up
- Includes remote control for indoor temperature adjustment
- CSA certified with multiple safety protections
- Fits standard 12.6 x 12.6 inch RV cutouts
Cons
- Lower flow rate of 3.9 GPM compared to 4.74 GPM competitors
- Single color option of white for this model
- No digital display mentioned for temperature readout
Good fit if
- You need a direct replacement for standard 6, 10, or 12-gallon RV tanks
- You require a remote control for temperature adjustments inside your vehicle
- You camp at elevations up to 9,800 feet
Skip if
- You need a flow rate higher than 3.9 GPM
- You prefer a black access door for this specific model
- You are installing in a location without 12V DC power
Verdict: APUS RV Propane Water Heater 68k BTU suits RV owners who need a compact, CSA-certified unit with remote control. It fits standard compartments but offers less flow than larger 4.74 GPM models.
VELPAX 4.74 GPM Indoor Propane Water Heater
Best for: Indoor multi-point hot water needs
- Fuel Type
- Propane
- Flow Rate
- 4.74 GPM
- BTU
- 68,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- 95°F to 149°F
- Dimensions
- 21.7 x 13.8 x 13.8 inches
View on Amazon: VELPAX 4.74 GPM Indoor Propane Water Heater Affiliate link
This VELPAX unit delivers 4.74 GPM of hot water using propane fuel. It features a 68,000 BTU output and an LED digital display for precise temperature control between 95°F and 149°F. The stainless steel body and oxygen-free copper tank ensure durability. Designed for indoor installation, it supports simultaneous use at two to three points, such as a bathroom and kitchen.
Pros
- High flow rate of 4.74 GPM
- 68,000 BTU/hr heating capacity
- LED digital temperature control
- Stainless steel and copper construction
Cons
- Indoor installation only
- Requires specific venting setup
- No outdoor weatherproofing
Good fit if
- You need hot water for two to three fixtures
- You have an indoor space with proper ventilation
- You want precise digital temperature settings
Skip if
- You require outdoor installation
- You need gas-fired units for outdoor use
- You prefer electric tankless heaters
Verdict: VELPAX 18L Propane Tankless Heater offers strong indoor performance for multi-point use. It suits homes needing reliable hot water delivery with digital control.
Specifications side by side
| Spec | APUS 68,000 BTU RV Propane Water Heater | VELPAX 4.74 GPM Indoor Propane Water Heater |
|---|---|---|
| Fuel Type | Propane | Propane |
| Flow Rate | 3.9 GPM | 4.74 GPM |
| BTU | 68,000 BTU | 68,000 BTU/hr |
| Installation Location | not stated | Indoor |
| Voltage | 12V DC | not stated |
| Temperature Control | not stated | 95°F to 149°F |
| Certification | CSA | not stated |
| Dimensions | 14.96 x 14.96 x 14.18 inches | 21.7 x 13.8 x 13.8 inches |
| Use | RV | not stated |
| Weight | 24 pounds | not stated |
| Color | White | White |
| Model | AP-AWH-RV10W-NEW | HWRSQ-18L-001 |
| Size | not stated | 18L |
Frequently asked questions
Which tankless water heater is better for indoor home use?
The VELPAX model is designed for indoor installation. It features a 18L capacity and digital controls for precise temperature management. This makes it suitable for multi-point hot water needs in residential settings. The APUS unit, by contrast, is built specifically for RV compartments and lacks the indoor-specific certifications and flow characteristics needed for whole-home use.
Does the APUS water heater come with a remote?
Yes, the APUS 68,000 BTU RV Propane Water Heater includes a remote control. This allows you to adjust settings without reaching the unit directly. It is particularly useful in tight RV compartments where access is limited. The VELPAX indoor model relies on its integrated digital interface rather than a separate remote device.
What are the physical dimensions of the APUS RV heater?
The APUS unit measures 14.2 inches in width, 15 inches in height, and 14.2 inches in length. It weighs 24 pounds. These compact dimensions allow it to fit standard RV compartments. The white finish helps it blend with typical RV interiors. Its small footprint makes it an easy replacement for larger tank-style heaters.
Is the VELPAX heater suitable for outdoor installation?
No, the VELPAX 4.74 GPM model is rated for indoor installation only. It is designed to handle multi-point hot water demands inside a home. Using it outdoors could void its safety certifications or damage the unit. The APUS model is intended for RV use, which often involves varied environmental conditions, but both are propane units requiring proper venting.
How does the VELPAX unit compare in size to the APUS?
The VELPAX is taller but narrower than the APUS. It measures 21.7 inches in height, compared to the APUS’s 15 inches. Both units share a similar width of approximately 13.8 to 14.2 inches. The VELPAX’s 18L capacity suggests a larger internal heat exchanger, which supports its higher flow rate for indoor applications.
Can I use the APUS heater for a cabin or small home?
The APUS is optimized for RVs, not stationary homes. It is CSA-certified for recreational vehicle use and runs on propane. While it provides 68,000 BTU, its lower flow rate of 3.9 GPM may not suffice for simultaneous indoor fixtures. The VELPAX model offers a higher flow rate and is better suited for stationary indoor multi-point needs.