RBI Boilers

RBI High Efficiency Commercial Boilers, Domestic Water Heaters, and Pool Heaters.

RBI provides the most complete line of finned copper tube boilers and water heaters available today.

RBI boiler models are available to fit any commercial application, from atmospheric to fan-assisted sealed combustion in a wide 100,000 to 4,000,000 BTU capacity range.

RBI All Products Brochure

Reliable Construction

RBI’s commercial water heaters are the only units on the market that come standard with bronze headers across the entire product line. Greater installation flexibility is provided by left or right gas connections and left and right water connections.

RBI Condensing Products

With efficiency levels reaching 99%, it’s easy to assume that you are simply dreaming. But RBI’s series of condensing, gas-fired boilers ensures that efficiency this high is now within reach.

See RBI’s condensing products.

RBI Near-Condensing

Delivering efficiencies up to 88%, RBI’s selection of near-condensing copper finned boiler models are built for strength and reliability, tackling the toughest challenges of the commercial boiler market. Available in on/off, 2-stage, 4-stage and full-modulation with reduced footprints, all RBI near-condensing boilers are constructed for simple boiler installation and maintenance.

See RBI’s near-condensing products.

Pool Heaters

RBI’s commercial pool heaters are built to outlast the competition – year after year.

  • Futera Series Pool Heaters
  • Dominator / LCD Dominator Pool Heaters
  • 8800 / 8900 Series Pool Heaters
  • Spectrum Series Pool Heaters

For Faster Heating:

  • For 1½°F (-17°C) rise per hour: Increase BTUH input by 50%
  • For 2°F (-17°C) rise per hour: Increase BTUH input by 100%
  • Always select a heater equal to or larger than the requirement. Oversizing generally reduces fuel cost


Introducing Flexcore

Up to 99% Maximum Efficiency | Full Modulation

Flexcore Symmetrical Firetube boilers bring hydronic heating products to unprecedented levels of operating efficiency.

Flexcore Symmetrical Firetube boilers bring hydronic heating products to unprecedented levels of operating efficiency. Unlike other manufacturers; from start to finish the Flexcore was designed, developed and engineered by the experts at RBI. Engineered for performance and longevity the Flexcore utilizes a perfectly temperature balanced heat exchanger that provides not only the highest efficiencies but also a durability beyond that of any competitive firetube boiler on the market.

Features and Benefits:

  • 1,500 – 6,000 MBHflexcore core
  • Up to 99% Maximum Efficiency
  • 96.8% AHRI Certified
  • Symmetrical Firetube Heat Exchanger
  • Primary/Secondar, Full Flow, and Variable Flow
  • Full Modulation
  • Patented “Turbo Pilot” 8,000 BTU/h Ignition
  • HeatNet 3.0 Integrated Control Platform
  • Touchscreen Programming & Diagnostics
  • Modbus, LonWorks, BACnet BMS Integration
  • Low NOx & CO
  • Modern Jacket Design
  • Premium Efficiency
  • Superior Durability
  • Easy Installation & Maintenance
  • PVC & Polypropylene (PP) Vent*
    *Pending Certification

Infinite Energy²

Condensing | 98% Effiency 199-1,000 MBH |Up To 20:1 Modulation

Part of RBI's stainless steel line of high-efficiency boilers and water heaters, Infinite Energy² is available from 199 to 1000 MBH, providing flexible solutions for all of your heating and domestic hot water system needs. Utilizing state-of-the-art Radial Variable Circulation (RVC) stainless steel heat exchangers, IE² maximizes heat transfer with operating efficiencies up to 98%.

Using all of today’s modern technologies, including pre-mix burners, modulating firing rates up to 20:1 and integrated cascade controls, IE² offers superior performance and application flexibility. Units are PVC, polypropylene and stainless steel vent capable and can be installed in multiple unit configurations using its on-board boiler control configuration – providing flexible modulation for maximum efficiencies.

Features and Benefits:

  • Up to 98% Ultra-High Efficiency
  • RVC Stainless Steel Heat Exchanger
  • PVC, PP and Stainless Steel Venting
  • Intuitive Integrated Control Platform
  • Multi-unit Cascade Communication
  • Pre-Mix Burner Technology
  • Low NOx and CO Emissions
  • 3″ Minimum Gas Pressure
  • 160 PSI Working Pressure
  • Integrated Condensate Neutralizer System
  • Full Modulation


Futera Fusion Gas-Fired Boilers

Condensing | 99% Efficiency| 500-2,000 MBH | 4:1 Modulation

The gas-fired Futera Fusion™ now brings the field-proven performance of Futera III Modulation boilers and water heaters to the ultimate levels of efficiency and reliability. This innovative design is the ideal choice for applications with low operating, return, or make-up water temperatures.

Unlike most condensing products available today which publish the highest efficiencies at the lowest inputs, the Fusion is capable of attaining efficiencies as high as 99% at Full Input!

The full modulation firing system continuously varies the energy input to precisely match heating load without overfiring or wasting fuel.

The Fusion’s heat exchanger was designed using the most efficient and dependable heat transfer materials available today. The low-mass, gasketless primary heat exchanger has solid cast iron headers and finned copper (or optional cupronickel) tubing for superior heat transfer, resistance to scaling and protection against thermal shock.

The benefits don’t stop there. The condensing secondary heat exchanger is constructed from solid stainless steel and is designed to operate at the boiler’s full flow rate. The unit operates in full condensing mode at all times, while a state-of-the-art temperature mixing system protects the boiler’s primary heat exchanger. In addition, this design also offers a larger heat transfer surface area – more so than any competitive product currently available. Simply put, there is no better way to protect your investment.

Features and Benefits:

  • Full Modulation with Continuous, 4:1 Turndown
  • Sealed Combustion/Direct Vent
  • Symmetrically Air/Fuel Coupled
  • Commercial Combustion Controls
  • HeatNet 3.0 Integrated Boiler Control Platform
  • Gasketless Heat Exchanger Assembly

Futera Fusion XLF

Condensing | 99% Efficiency | 2,500-4,000 MBH | 5:1 Modulation

As a fully condensing, gas-fired boiler, the Fusion XLF features an innovative design that brings superior power and energy efficiency with premium boiler performance and serviceability, all together in an unprecedented, industry-leading, small package design.

Ideal for commercial boiler applications with low operating, return or make-up water temperatures, the Fusion XLF is capable of reaching efficiencies as high as 99% at full input. With full modulation up to 5:1, the firing system continuously varies the energy input to match the heating load without overfiring and wasting fuel – providing extremely high part-load efficiencies.

The Fusion XLF also features HeatNet 3.0, an intuitive boiler control system that monitors system characteristics and modulates boiler firing rates, maximizing turndown ratios and maintaining peak efficiency, regardless of the load.

Features and Benefits:

  • Up to 99% Efficiency
  • Full Modulation with Continuous, 5:1 Turndown
  • Sealed Combustion/Direct Vent
  • Symmetrically Air/Fuel Coupled
  • Commercial Combustion Controls
  • HeatNet 3.0 Integrated Boiler Control Platform
  • Gasketless Heat Exchanger Assembly

Futera XLF

Near Condensing |88% Efficiency | 2,500-10,000 MBH | 5:1 Modulation

Available in 2,500-10,000 MBH, the Futera XLF has operating efficiencies up to 88% and turndown ratios of 5:1 for maximum energy optimization.

The Futera XLF features integral HeatNet 3.0 boiler control software that is a boiler management system, capable of networking up to sixteen units without requiring any external boiler control panel. With such advanced performance in a small space, even older boiler systems can benefit from the addition of contemporary efficiency for existing heating or domestic hot water systems. For new construction, the Futera XLF provides a modular configuration with an output unmatched by today’s market.

Features and Benefits:

  • 88% Maximum Efficiency
  • 2,500-10,000 MBH
  • Bronze Headers (Water Heaters)
  • Full Modulation with Smooth, 5:1 Turndown
  • Copper Finned Tube Heat Exchanger
  • HeatNet 3.0 Integrated Boiler Management System
  • Turbo Pilot Sure-Fire Ignition
  • Stainless Steel Jacket Panels
  • Multiple Venting Options


Futera III

Near-Condensing | 88% Efficiency | 500-1,999 MBH | 4:1 Modulation

These dependable, easy-to-service boilers feature rugged construction and sleek, stainless steel jacket design. With models ranging from 500-1999 MBH, all Futera III units come equipped with HeatNet 3.0 boiler control software, ensuring the highest operating efficiencies of any domestic boiler and hydronic heating system on the market.

Features and Benefits:

  • 88% Maximum Efficiency
  • 500-1,999 MBH
  • Full Modulation with 4:1 Turndown
  • Cast Iron Headers (Boilers)
  • Bronze Headers (Water Heaters)
  • HeatNet 3.0 Integrated Boiler Management System
  • Copper Finned Tube Heat Exchanger
  • Symmetrically Air/Fueled Coupled
  • Gasketless Heat Exchanger Assembly
  • Modbus Protocol for BMS Communications
  • Stainless Steel Jacket Panels

Futera II

Near-Condensing | 85% Efficiency | 500-1,950 MBH | On/Off or 2-Stage

Futera II Series hot water supply boilers provide dependable boiler performance with 85% efficiency levels, alongside industry-leading NOx levels of less than 10 ppm. With sizing that ranges from 500 to 1,950 MBH, the Futera II provides a high concentration of BTUs in a small footprint, making it an excellent choice for jobs where mechanical space is limited, as well as other modular, step-fired boiler applications.

The Futera II’s compact, low maintenance boiler and venting flexibility permit easy boiler installation and service, making it the ideal non-condensing, gas-fired boiler and hot water heater for any hot water supply application. Futera II units have the ability to use room air for combustion and are also capable of drawing in air from the outside for sealed combustion. Units can be set up to vent vertically as Category I appliances or horizontally as Category III through a sidewall, making the Futera II ideal for buildings without chimneys, where roof penetrations cannot exist or on electric-to-gas conversions.

Features and Benefits:

  • 500-1,950 MBH
  • Up to 85% Efficiency
  • Advanced Diagnostic Panel
  • Cast Iron Headers (Boilers)
  • Bronze Headers (Water Heaters)
  • Flame Safeguard Control
  • One-Piece Header Design
  • Pump Delay Relay
  • Stainless Combustion Chamber
  • Vertical or Horizontal Venting Options
  • 2-Stage Digital Operator
  • CSD-1 & FM Compliant Gas Train


Near-Condensing | 85% Efficiency | 300-2,100 MBH | 2-Stage/4-Stage

The Dominator Series from RBI, with sizing from 300 to 2,100 MBH, offers the ultimate flexibility in boiler and water heater application, all at a competitive price.

With efficiencies nearing 85.1%, the Dominator has one of the highest efficiency levels available in non-condensing boiler and water heater market. Capable of operating using mechanical room air for combustion or by drawing outside air directly as a sealed combustion product, the Dominator can vent combustion gases vertically or horizontally with factory equipped draft-inducer kits.

In commercial boiler applications where mechanical space is limited, the Dominator’s stackable frame option allows units to be stacked two-high, adding valuable BTUs while keeping the footprint to the size of a single unit. In addition, the Dominator provides up to four stages of firing, allowing the boiler to match the heating load more closely.

And with built-in serviceability features, including a slide out heat exchanger, contractors no longer need to remove the heat exchanger for service or repair, which, when coupled with high efficiencies, makes the Dominator a cost-saving option for any boiler application.

Features and Benefits:

  • Up to 85% Efficiency
  • 300-2,100 MBH
  • 2 or 4-Stage Firing Modes (300 On/Off Only)
  • Cast Iron Headers (Boilers)
  • Bronze Headers (Water Heaters)
  • Category I & III Venting
  • Finned Copper Tube Heat Exchanger – Two-Pass
  • Stackable Frame (Seismic Approval up to Zone 4)
  • Direct Vent (up to 35’ Equivalent)

LCD Dominator

Near-Condensing | 225-2,300 MBH | On/Off or 2-Stage

The LCD Dominator Series offers a competitively priced indoor/outdoor boiler and hot water heating unit that meets low NOx requirements, while maintaining superior performance and serviceability that RBI is known for. The LCD provides dependable performance in a wide range of rugged environments and process applications with a wide 225 to 2,300 MBH range.

At the heart of the unit is a sealed combustion chamber that provides the flexibility of using either outside air or mechanical room air for combustion. Providing better performance while being priced in line with atmospheric boilers on the market, the LCD features smaller vent sizes, resulting in lower boiler installation and operation costs.

The LCD features a robust, compact design that is constructed with high-quality materials, which, when paired with a proven pilot ignition system and a wide variety of venting options, makes this unit one of the most dependable non-condensing boilers in the commercial boiler market.

Features and Benefits:

  • 225-2,300 MBH
  • Finned Copper Tube Heat Exchanger
  • On/Off, All Sizes 2-Stage, 600-2,300
  • Cast Iron Headers (Boilers)
  • Bronze Headers (Water Heaters)
  • Category I Vertical Venting
  • Category III Thru-Wall Venting (up to 35’)
  • Slide-Out Heat Exchanger
  • Stackable Frame (Seismic Approval up to Zone 4)


Non-Condensing |Hot Water Heater / Pool Heater |100-399 MBH | On/Off or 2-Stage/4-Stage

With models ranging from 100-399 MBH, Spectrum Series boilers’ unique design and optional corrosion-resistant, brushed stainless steel jackets make them ideal for indoor and outdoor installations in corrosive or harsh environments.

A unique feature within this MBH range, the Spectrum Series’ diagnostic control panel allows for easy troubleshooting, and, when coupled with the self-diagnostic light package, makes the Spectrum Series easy to assess, maintain and service. All Spectrum Series non-condensing, gas-fired boilers and hot water heaters are constructed using cast iron headers for application flexibility, and feature built-in draft diverters to lower the height of the unit and, most importantly, to reduce installation costs.

Features and Benefits:

  • 100-399 MBH
  • On/Off or 2-Stage/4-Stage
  • Automatic Reset High Limit 100-200
  • Manual Reset High Limit 250-400
  • Built-in Draft Diverter
  • Stainless Steel Burners
  • Cast Iron Headers (Boilers)
  • Bronze Headers (Water Heaters)
  • Inlet & Outlet Thermometers
  • Mounted and Wired Flow Switch
  • Vent Damper (100-250 MBH Boilers Only)
  • Self Diagnostic Light Package
  • Pump Control
  • Electronic Ignition

Heatnet 3.0

Designed for precise system control and increased energy optimization, HeatNet 3.0 is a standard and equally integral feature. And with HeatNet Online, RBI & KN Series boilers can be monitored remotely, ensuring optimal boiler efficiency regardless of time or location.

By continuously monitoring several system characteristics, HeatNet 3.0 modulates boiler-firing rates to maximize turndown ratios and maintain peak efficiency – no matter the load.

HeatNet 3.0 doesn’t just benefit stand-alone RBI & KN Series boilers; it is a valuable and cost-saving tool in operating a multi-boiler Master/Member network of up to 16 boilers. By functioning as a boiler management system, HeatNet 3.0 can incorporate a mixture of condensing boilers and non-condensing boilers to eliminate costly third-party, wall-mounted boiler control platforms.