# Fulton Heat Transfer — Canonical Product, Control & System Index > Fulton Heat Transfer manufactures high-efficiency steam boilers, hydronic boilers, thermal fluid heaters, water heaters, controls, and engineered heat transfer systems for commercial and industrial applications. > Curated index of Fulton's live canonical HTML product, control, and system pages. Selected technical pages are intentionally staged separately and should be added to this file only after their public HTML pages are upgraded beyond PDF-wrapper content. ## Company - [About](https://fulton.com/about/) - [How to Buy](https://fulton.com/how-to-buy/) ## Steam Boilers - [Classic Vertical Tubeless Steam Boiler](https://fulton.com/products/classic/): The Fulton Classic is a vertical tubeless steam boiler ranging from 4 to 60 BHP, based on the original design Fulton invented in 1949. With over 75 years in production and more than 100,000 installations worldwide, it is a proven workhorse suited to virtually every industry. The tubeless design eliminates retubing costs and downtime, making it one of the most reliable and long-lived boilers available. - [FBE High Efficiency Electric Steam Boiler](https://fulton.com/products/fbe/): The Fulton FBE is a compact, combustion-free electric steam boiler producing high-quality saturated steam at nearly 100% efficiency. Ranging from 12 to 180 kW, it is designed for applications where zero emissions, clean operation, and a small footprint are priorities. The FBE carries ASME-M certification and a design pressure of 100 PSI. - [FBL High Efficiency Electric Steam Boiler](https://fulton.com/products/fbl/): The Fulton FBL is a fully packaged, high-efficiency electric steam boiler covering a wide capacity range of 12 to 1,000 kW. It features fully-insulated pressure vessels to minimize radiation losses and a carefully engineered heat-to-steam ratio that achieves operating pressure quickly and with nearly 100% efficiency. The FBL produces zero NOx emissions, making it an environmentally friendly choice for clean or emissions-sensitive facilities. - [FBS Horizontal Firetube Steam Boiler](https://fulton.com/products/fbs/): The Fulton FBS is a large-capacity horizontal firetube steam boiler ranging from 60 to 1,000 BHP, with over 10,000 units sold in more than 40 countries. It is factory-packaged with an integrated boiler, burner, and control package engineered for best-in-class 82% efficiency and the lowest total cost of ownership. The FBS is built to ASME Section I and IV standards with design pressures up to 300 PSI, and is both biofuel-ready and 20% hydrogen-ready. - [FBX Flexible Watertube Boiler (Steam or Hot Water)](https://fulton.com/products/fbx/): The Fulton FBX is a flexible watertube boiler available in steam or hot water configurations, ranging from 31 to 920 BHP. It can be factory packaged or field erected, and is designed to deliver best-in-class efficiency with versatile burner choices. The FBX is built to ASME Section I and IV standards, supports pressures up to 300 PSI for steam models, and is both biofuel-ready (up to B100) and hydrogen-ready (up to 20% blend). - [FBZ Electric Steam Boiler](https://fulton.com/products/fbz/): The Fulton FBZ is a fully packaged electric steam boiler platform covering 90 to 3,000 kW for emissions-free commercial and industrial steam generation. - [VMP Vertical Multi-Port Boiler](https://fulton.com/products/vmp/): The VMP (Vertical Multi-Port) is Fulton's heavy-duty vertical steam and hot water boiler, available from 40 to 150 BHP. Its compact tubeless vertical design has been proven through decades of installations and is engineered to last 25 years or more, with a pressure vessel wall thickness 30% greater than ASME requirements. The VMP delivers efficiencies up to 85% by achieving 4-pass heat transfer performance in a compact 2-pass design, making it well-suited for modular arrays and space-constrained mechanical rooms. - [VSRT Vertical Spiral Rib Tubeless Steam Boiler](https://fulton.com/products/vsrt/): The Fulton VSRT (Vertical Spiral Rib Tubeless) is a heavy-duty industrial steam boiler designed to set a new standard in efficiency, longevity, and ease of installation. Ranging from 9.5 to 250 BHP, the VSRT uses a patented spiral rib heat exchanger and fully water-backed, refractory-free pressure vessel to deliver best-in-class thermal efficiency and the longest boiler life expectancy available. It is suitable for the full range of industrial and commercial steam applications. - [VSRT-E Hybrid Gas & Electric Vertical Tubeless Steam Boiler](https://fulton.com/products/vsrte/): The Fulton VSRT-E is a hybrid gas and electric vertical tubeless steam boiler ranging from 9.5 to 60 BHP. It combines the proven performance of the VSRT gas-fired platform with integrated zero-emissions electric heating elements, giving facilities the flexibility to operate on natural gas, electricity, or both. The VSRT-E is designed for organizations pursuing dual-fuel capability, emissions reduction, or a transition pathway toward electrification while maintaining steam reliability. ## Hydronic Boilers - [ENDURA LB Liquid-Cooled Load Bank Electric Hot Water Boiler](https://fulton.com/products/endura-lb/): The Fulton ENDURA LB is a liquid-cooled load bank electric hot water boiler designed specifically for simulating load conditions during system testing in liquid-cooled data centers. Ranging from 300 to 600 kW, it combines a robust ASME-stamped pressure vessel with turnkey mobility features — cam-lock quick connects, built-in casters, and an integral crash frame — for rapid deployment and minimal downtime. Efficiency is rated up to 99% with zero Scope 1 emissions. - [ENDURA Ultra-High Efficiency Condensing Boiler](https://fulton.com/products/endura/): The Fulton ENDURA is an ultra-high efficiency condensing hot water boiler ranging from 750,000 to 2 million BTU/HR, built on a compact 3-pass firetube platform with efficiencies up to 99%. It features a duplex stainless steel heat exchanger, Flame-by-Wire combustion control, and Real-Time O2 Compensation for precise, low-emission operation. The ENDURA is designed for commercial and industrial heating plants requiring maximum efficiency, minimal footprint, and advanced multi-boiler sequencing. - [ENDURA XE Condensing Firetube Hydronic Boiler](https://fulton.com/products/endura-xe/): The Fulton ENDURA XE is a condensing firetube hydronic boiler covering 399,000 to 6 million BTU/HR, combining industrial-grade durability with up to 99% efficiency and decarbonization-ready combustion technology. It features Flame-by-Wire electronic combustion controls, Real-Time O2 Compensation, and premium 439/Duplex stainless steel construction that resists scale, corrosion, and chloride stress cracking. The ENDURA XE is built for both retrofit and new construction applications, with zero side clearance, 16 venting configurations, and variable primary flow compatibility. - [ENDURA ZE Zero-Emissions Electric Hydronic Boiler](https://fulton.com/products/endura-ze/): The ENDURA ZE is a zero-emissions electric hydronic boiler from Fulton, designed for facilities looking to eliminate on-site combustion emissions while maintaining reliable, high-efficiency heating. Rated from 120 to 600 kW, it uses a Silicon Controlled Rectifier (SCR) for ultra-precise load matching and is built with a rugged, high-mass design intended for long service life. It is well-suited for new construction and retrofit projects where electrification and decarbonization are priorities. - [ENDURA+ Ultra-High Efficiency Condensing Boiler](https://fulton.com/products/endura-plus/): The ENDURA+ is an ultra-high efficiency condensing hot water boiler from Fulton, available from 2.5 million to 12 million BTU/HR. It features a heavy-duty duplex stainless steel heat exchanger, Flame-by-Wire™ electronic combustion controls, and Real-Time O₂ Compensation™ for continuous air-fuel optimization. The ENDURA+ is built for high-demand commercial and institutional applications where long-term durability, low operating costs, and high efficiency are critical. - [VANTAGE Dual-Fuel Condensing Boiler](https://fulton.com/products/vantage/): The VANTAGE is Fulton's dual-fuel condensing firetube boiler, rated from 2 million to 6 million BTU/HR, and the first dual-fuel gas and oil condensing boiler introduced in North America. It combines industrial-grade duplex stainless steel construction with efficiencies up to 99%, and is purpose-built for mission-critical facilities that require fuel redundancy without sacrificing efficiency. The VANTAGE holds the largest install base in its class and is the preferred choice for healthcare, education, government, and military applications. ## Water Heaters - [InTherm Indirect Domestic Hot Water Generator](https://fulton.com/products/intherm/): The Fulton InTherm is a fully packaged, indirect tankless domestic hot water generator that delivers up to 90 GPM of hot water using high-efficiency plate-and-frame heat exchangers with real-time load tracking. It eliminates the need for large storage tanks and is sized to fit through standard doorways, making it well suited for both new construction and retrofit projects. The InTherm is compatible with thermal fluid systems as well as low-temperature condensing boiler water. - [KESTAVA Condensing Tankless Water Heater](https://fulton.com/products/kestava/): The KESTAVA is a condensing tankless water heater from Fulton, rated from 750,000 to 2 million BTU/HR, designed for commercial domestic hot water applications. Built on Fulton's proven 3-pass firetube architecture with duplex stainless steel construction, it delivers up to 99% efficiency and industrial-grade reliability in a compact footprint. It is purpose-built for large recirculation loops and can also be used with storage tanks, handling wide variations in flow and temperature without issue. ## Controls - [Flame-by-Wire Electronic Air-Fuel Ratio Combustion Control](https://fulton.com/products/flamebywire/): Flame-by-Wire is Fulton's advanced combustion control technology that replaces conventional pneumatic and mechanical linkage systems with independent electronic air and gas valves. Inspired by advances in automotive and aviation controls, it continuously optimizes the air/fuel ratio across the full modulation range — not just at low and high fire endpoints. Real-time O2 Compensation automatically tunes the burner for maximum seasonal efficiency, reducing fuel use and carbon emissions. - [ModSync Boiler Plant Sequencing Control](https://fulton.com/products/modsync/): ModSync is Fulton's boiler plant sequencing control system for steam and hydronic applications, available in three variants: SE (standard off-the-shelf), LX (custom engineered), and FW (feedwater system controller). It serves as a centralized hub for the entire boiler plant, combining intelligent lead-lag staging with a user-friendly graphical touchscreen to maximize efficiency, equipment longevity, and energy savings. ModSync is designed for facilities with multiple boilers that need optimized part-load sequencing and seamless automation. - [PURE Control Integrated Boiler Control System](https://fulton.com/products/pure-control/): Fulton's PURE Control sequences up to 10 boilers without a master panel and adds pump, outdoor reset, domestic hot water, and BAS integration features. ## Thermal Fluid Heaters - [Alliance Horizontal 3-Pass Thermal Fluid Heater](https://fulton.com/products/alliance/): The Fulton Alliance is a 3-pass horizontal coil thermal fluid heater designed for large-capacity industrial heating applications. It circulates thermal fluid (rather than steam or water) through a helical coil heat exchanger, delivering high efficiency and prolonged fluid life. The Alliance is suited for operations requiring continuous, high-output process heat with low overall cost of ownership. - [FT-C Vertical Coil Thermal Fluid Heater](https://fulton.com/products/ft-c/): The Fulton FT-C is a vertical coil thermal fluid heater designed to deliver industry-leading efficiency and reliability at the lowest cost of ownership. Its four-pass flue gas design with integrally preheated combustion air maximizes heat recovery, while CFD- and FEA-verified coil geometry ensures even heat transfer and prolonged thermal fluid life. It is suited for industrial facilities requiring high-output, compact heating with Low NOx combustion. - [FT-N Vertical Electric Thermal Fluid Heater](https://fulton.com/products/ft-n/): The Fulton FT-N is a fully electric, multi-bundle thermal fluid heater ranging from 20 to 500 kW (74,000 to 1,685,000 BTU/Hr output). It is designed for facilities seeking zero scope 1 emissions, long service life, and high thermal efficiency. The compact vertical design minimizes installation footprint and eliminates the need for gas lines or fuel storage infrastructure. - [Hopkins Horizontal Coil Design Thermal Fluid Heater](https://fulton.com/products/hopkins-hpn/): The Fulton Hopkins (HPN) is a fired, horizontal coil thermal fluid heater designed for large-capacity industrial heating applications, ranging from 1 million to 40 million BTU/hr output. Its 2-pass horizontal design with helical coils delivers high heat transfer efficiency across a wide range of process temperatures up to 650°F. Low NOx burner options are available for emissions-sensitive applications. ## Systems & Packages - [Engineered Systems](https://fulton.com/products/engineered/): Fulton's Engineered Steam Boiler Systems are custom-designed, factory-assembled skid packages built to meet any steam application requirement. Fulton assumes full design responsibility from concept through commissioning, delivering complete turnkey systems with single-point connections for rapid on-site assembly. With over 40 years of system design and manufacturing expertise, these packages are engineered for the lowest cost of ownership, longest equipment life, and highest system efficiency. - [Feedwater Systems](https://fulton.com/products/feedwater-systems/): Fulton's Horizontal Feedwater Systems are atmospheric feedwater units designed to extend boiler life by reducing oxygen levels and contaminants in boiler feedwater. The horizontal tank provides additional storage for treated makeup water and condensate returns, increasing overall system efficiency. Available in eight models covering 1–600 BHP, the system is fully configurable to meet the needs of any steam application.