VELPAX Tankless Water Heaters: 5 Picks Ranked by Specs

Quick picks

Our 5 picks

1 Best overall

VELPAX 4.74 GPM Indoor Propane Water Heater

Best for: indoor propane heating 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 indoor propane tankless water heater delivers 4.74 GPM with a 68,000 BTU/hr output. It features an oxygen-free copper water tank and stainless steel body for durability. The LED display allows temperature adjustments from 95°F to 149°F. It operates at just 3.6 PSI water pressure. This unit is designed for simultaneous use at two to three points, making it suitable for bathrooms and kitchens.

Pros

• 4.74 GPM flow rate for multi-point use
• 68,000 BTU/hr heating output
• Oxygen-free copper water tank
• LED digital temperature display
• Operates at 3.6 PSI water pressure

Cons

• Lower BTU output than competitors
• Indoor installation only
• Propane fuel type limits placement

Good fit if

• You need an indoor propane unit
• You want steady temperature control
• You require low water pressure operation

Skip if

• You need outdoor installation
• You prefer natural gas
• You require higher flow rates

Verdict: VELPAX Propane Indoor 18L is a compact indoor option for homes needing reliable propane heating. It suits buyers who prioritize steady temperature control and low water pressure operation over higher BTU outputs.

2 Best budget

VELPAX 4.74 GPM Indoor Natural Gas Tankless Heater

Best for: Indoor bathroom and kitchen use

Fuel Type

Natural Gas

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 Natural Gas Tankless Heater Affiliate link

This VELPAX unit delivers 4.74 GPM of hot water using 68,000 BTU of natural gas power. It operates indoors with a compact stainless steel body and oxygen-free copper tank. The LED display lets you set temperatures between 95°F and 149°F. It handles two to three simultaneous points of use. The low 3.6 PSI water pressure requirement makes it suitable for various home setups.

Pros

• 68,000 BTU/hr output for steady hot water
• 4.74 GPM flow rate supports multiple fixtures
• LED digital display for precise temperature control
• Stainless steel body and copper tank for durability

Cons

• Indoor installation only, limiting placement options
• Lower 68,000 BTU output compared to competitors
• Requires standard 2.5-inch horizontal vent pipe

Good fit if

• You need a compact indoor unit for a bathroom and kitchen
• You have a natural gas supply available
• You want precise digital temperature control

Skip if

• You require outdoor installation capabilities
• You need higher flow rates for whole-house use
• You prefer propane fuel sources

Verdict: VELPAX 4.74 GPM Indoor Natural Gas Heater offers steady performance for small households. It fits homes needing reliable indoor heating with digital controls.

3 Also great

VELPAX 5.26 GPM Propane Outdoor Heater

Best for: outdoor whole-house hot water

Fuel Type

Propane

Flow Rate

5.26 GPM

BTU

120,000 BTU/h

Installation Location

Outdoor

Voltage

120V AC

Temperature Control

35℃–65℃, ±1℃

View on Amazon: VELPAX 5.26 GPM Propane Outdoor Heater Affiliate link

This outdoor propane unit delivers 5.26 GPM at 120,000 BTU. It uses a stainless steel body and oxygen-free copper tank for durability. The LED display and remote control allow precise temperature settings between 35℃ and 65℃. It handles low water pressure starting at 3.16 PSI. This model suits homes needing high flow for multiple fixtures outdoors.

Pros

• 120,000 BTU output supports 3–4 fixtures
• 5.26 GPM flow rate for whole-house use
• Remote control panel for indoor operation
• ±1℃ temperature stability with water servo

Cons

• Outdoor installation only
• Propane fuel requires tank management
• No smart app connectivity listed

Good fit if

• You need high flow for multiple outdoor showers
• You want precise temperature control via remote
• You have propane access for outdoor use

Skip if

• You require indoor installation
• You prefer natural gas over propane
• You need smart home integration

Verdict: VELPAX 5.26 GPM Propane Outdoor Heater offers robust outdoor performance with precise temperature control. It fits users needing high flow for multiple fixtures without indoor constraints.

4 Best premium

VELPAX Outdoor Natural Gas Tankless Heater

Best for: RV outdoor shower and multi-outlet use

Fuel Type

Natural Gas

Flow Rate

4.76 GPM

BTU

110,000 BTU

Installation Location

Outdoor

Voltage

110 V, 60 Hz

Use

RV

View on Amazon: VELPAX Outdoor Natural Gas Tankless Heater Affiliate link

This VELPAX unit delivers 4.76 GPM of hot water using 110,000 BTUs of natural gas power. It is built for outdoor wall-mount installation and features a weather-resistant design suitable for harsh conditions. The package includes a remote control with a 16.4 ft cable for indoor temperature adjustments. It supports three to four simultaneous outlets, making it a practical option for RVs or homes needing reliable on-demand heating.

Pros

• High 110,000 BTU output for fast heating
• Includes remote control with 16.4 ft cable
• Weather-proof construction for outdoor use
• Supports 3-4 simultaneous water outlets

Cons

• Limited to natural gas fuel type only
• Requires 110V AC power supply
• Outdoor installation only, not for enclosed spaces

Good fit if

• You need a weather-resistant unit for outdoor RV use
• You want to adjust temperatures from inside your home
• You require high flow rates for multiple outlets

Skip if

• You need a propane or indoor-only model
• You prefer digital smart home integration
• You have limited 110V power availability

Verdict: VELPAX Outdoor Natural Gas 4.76 GPM Heater provides strong outdoor performance with convenient remote access, making it a solid choice for RV owners or homes needing durable, high-flow heating.

5 Also great

VELPAX 4.74 GPM Natural Gas Heater

Best for: indoor multi-fixture hot water needs

Fuel Type

Natural Gas

Flow Rate

4.74 GPM

BTU

82,000 BTU/h

Installation Location

Indoor

Temperature Control

86°F–167°F

Dimensions

23.9 x 15.5 x 15.5 in

View on Amazon: VELPAX 4.74 GPM Natural Gas Heater Affiliate link

This indoor natural gas unit delivers 4.74 GPM with a maximum output of 82,000 BTU per hour. It features a stainless steel body and a copper water tank for durability. The LED display allows precise temperature adjustments between 86°F and 167°F. You get stable water flow for three to four simultaneous fixtures. It suits homes needing reliable hot water for kitchens and bathrooms.

Pros

• 4.74 GPM flow rate for multiple fixtures
• 82,000 BTU/hour maximum power output
• Precise LED temperature control from 86°F to 167°F
• Stainless steel construction with copper water tank

Cons

• Lower BTU output than competitors offering 110,000 BTU
• Indoor installation only, not suitable for outdoor use
• Smaller flow rate compared to 5.26 GPM models

Good fit if

• You need hot water for three to four simultaneous fixtures
• You prefer indoor installation with precise temperature control
• You want a compact unit that saves space

Skip if

• You require outdoor installation capabilities
• You need a higher flow rate than 4.74 GPM
• You want a unit with higher BTU output than 82,000

Verdict: VELPAX 4.74 GPM Natural Gas Heater provides reliable indoor hot water with precise temperature control. It fits households needing stable flow for multiple fixtures without requiring outdoor placement.

Specifications side by side

VELPAX Tankless Water Heaters Overview

VELPAX offers distinct indoor and outdoor units tailored to your fuel source and space. The indoor Propane model, rated at 18L, provides steady temperature control for homes prioritizing low water pressure operation. For natural gas users, the indoor 18L unit with digital controls suits small households needing reliable kitchen and bathroom heating. The gray indoor Natural Gas option also supports multi-fixture needs without requiring outdoor placement.

Outdoor shoppers have robust choices for whole-house or RV use. The 20L Propane Outdoor Heater delivers high flow with precise temperature control, ideal for multiple fixtures. The Outdoor Natural Gas model, designed for RVs, offers strong performance with remote access. These units handle demanding environments while maintaining consistent hot water delivery for various household applications.

Where VELPAX Fits Your Home

VELPAX offers five models spanning 18L to 20L sizes. You choose between indoor or outdoor installation and propane or natural gas fuel. The 18L indoor units suit small households needing steady performance. The 20L outdoor propane model handles whole-house demand. The outdoor natural gas unit supports RV use. All units are rectangular. Colors are white or gray. The range lacks large commercial-grade capacity. It also does not offer electric fuel options. You get reliable, compact heating for residential needs without industrial bulk.

How to choose the right one

1. Match fuel to supply

   Your existing gas line dictates your choice. If you have propane tanks, the 18L indoor model suits your needs. It provides steady temperature control for homes with low water pressure. If you have a natural gas line, consider the indoor unit with digital controls. It offers reliable performance for small households. Always verify your fuel source before purchasing. Mismatching fuel types can prevent installation. Check your current supply to ensure compatibility with the specific unit you select.

2. Plan for installation site

   Indoor units require specific ventilation and space. The 18L indoor models fit compact areas but need proper airflow. Outdoor units like the 20L propane model handle whole-house demand without indoor constraints. They are built for exterior exposure. Choose outdoor placement if you have limited interior space. Indoor units are better for protected environments. Consider weather exposure for outdoor units. Ensure your chosen location supports the unit's dimensions and ventilation requirements for safe operation.

3. Check capacity needs

   Flow rate determines how many fixtures you can use. The 20L outdoor propane model offers 5.26 GPM for multiple simultaneous uses. The 18L indoor units provide 4.74 GPM. This is sufficient for small households or single-bathroom setups. Higher flow rates support whole-house hot water needs. Lower flow rates are adequate for kitchen sinks or showers alone. Match your household size to the unit's capacity. Larger families may need the higher output model. Smaller homes can save space with the compact 18L option.

4. Consider RV compatibility

   RV owners need durable, high-flow heating solutions. The outdoor natural gas unit provides strong performance for outdoor showers. It includes convenient remote access for easy control. This model is ideal for multi-outlet use in recreational vehicles. Check the voltage requirements, as it uses 120V power. Ensure your RV electrical system supports this input. The compact design fits limited spaces. This unit offers reliable heating for mobile living. Verify your power supply before installation to ensure proper functionality.

5. Verify physical dimensions

   Space constraints matter for both indoor and outdoor installs. The 18L indoor units measure 13.8 by 21.7 inches. They fit tight corners or utility closets. The outdoor models are slightly larger. The 20L unit is 14.4 by 22.8 inches. The outdoor natural gas unit is 15 by 24 inches. Measure your installation area carefully. Ensure there is enough clearance for maintenance. Compare these dimensions to your available space. Proper fit ensures safe operation and easy access for future service needs.

Frequently asked questions

See also

• best tankless water heaters under 150
• best tankless water heaters under 200