Natural Gas Tankless Water Heater - ORBEK 120000 BTU Up to 5.1 GPM

In this review of the Natural Gas Tankless Water Heater ORBEK 120000 BTU, the bottom line is simple: it is a robust outdoor on-demand heater best suited for homeowners who need reliable, continuous hot water for two to four fixtures. The reviewer found the combination of high output (up to 5.1 GPM), sturdy weatherproofing and built-in safety features to be the single biggest reason to buy for cold climates or exposed installations. Installation requires standard plumbing and a 3/4' NPT gas connector, and professional installation is recommended for best performance and safety.

Key Features

• Endless On-Demand Hot Water: Provides up to 5.1 GPM and 120000 BTU so multiple showers and fixtures can run simultaneously without tank recovery time.
• Outdoor Durability: Designed for outdoor use with IPX4 surface waterproof protection and resistance to strong winds, making it suitable for exposed installations.
• Advanced Safety: CSA certified with dry combustion protection, overheat and flame failure protection, anti-freeze and water leakage prevention for safer operation.
• Efficient Heat Exchanger: Oxygen-free copper heat exchanger improves heat transfer and corrosion resistance while allowing four adjustable heating modes to save energy.
• Stable Temperature Control: Built-in chip adjusts heating power rapidly to maintain water temperature within about 1F for consistent showers.
• Easy Controls and Display: LED digital display and included wired remote control let you set temperatures between 95F and 149F with power-off memory for convenience.

Who It's For

The ORBEK tankless heater is ideal for homeowners with outdoor mounting needs who want continuous hot water for a small to medium household, especially where multiple fixtures run at once. Its cold-weather protections and low water pressure start make it a good match for rural or seasonal homes that experience freezing temperatures or lower incoming supply pressure.

Those who should look elsewhere include buyers who need an indoor-mounted unit, an integrated valve kit and pressure relief assembly (the valve kit is not included), or households that require flow rates substantially above 5.1 GPM for larger multi-bath systems.

Pros & Cons

Pros

• High capacity output up to 120000 BTU and 5.1 GPM supports multiple simultaneous fixtures.
• Built for outdoor conditions with IPX4 protection and wind resistance for reliable exterior mounting.
• Comprehensive safety features and CSA certification provide peace of mind.
• Low water pressure start tech and quiet operation work well in remote or low-pressure locations.

Cons

• Valve kit with 150PSI pressure relief valve is required but not included, adding to initial installation cost.
• Professional installation is recommended, so DIY buyers should budget for a qualified installer.

Specifications

Our Verdict

The ORBEK Natural Gas Tankless Water Heater is a strong value for homeowners who need an outdoor on-demand heater that handles cold weather and multiple fixtures reliably. With a copper heat exchanger, tight temperature control and wide safety protections, it is worth the purchase for installations needing up to 5.1 GPM, provided buyers account for the separate valve kit and professional installation costs.

Frequently Asked Questions

Is a temperature controller required?
No, the wired controller comes with the unit so no separate purchase is needed for temperature control.

Does the package include the valve kit and pressure relief valve?
No, the valve kit with a 150PSI pressure relief valve is not included and must be installed separately.

Is this unit rated for outdoor installation in cold climates?
Yes, it has anti-freeze protection, IPX4 waterproofing and is designed to operate effectively in low temperatures and strong winds.