In 1949, Fulton pioneered the vertical tubeless design, which quickly became the industry standard for industrial steam boilers. Since that time, no one has been able to improve upon Fulton's original design.
Now, 70 years on, Fulton has raised the bar with the VSRT (Vertical Spiral Rib Tubeless) boiler, the world’s first fully wetted, refractory-free vertical tubeless boiler and the new standard for industrial steam boiler design.
With multiple worldwide patents pending in three continents, the VSRT's spiral-rib heat exchanger is a world first. It attains industry-leading heat transfer rates thanks to its unique spiral design, which achieves low stack temperatures by passing the flue gases through a spiral-wound heat exchanger that is fully immersed in water.
This all-new spiral-rib design benefits from an extended heat transfer path and dual-direction heat flow, with the spiral annulus designed and optimised to create high heat transfer rates. This optimises heat transfer to create a longer-lasting boiler that we believe will beat the competition in every category of durability!
The ground-breaking spiral rib heat exchanger design not only allows Fulton to improve boiler efficiency but, with virtually zero thermal stress, a thick walled construction and featuring vertical tubeless design architecture, the VSRT is one of the most durable steam boilers available.
It features a fully water-backed pressure vessel, which is wrapped in high-density insulation to achieve minimal thermal losses and low outer surface temperatures. The tubeless design has also enabled Fulton to create a compact boiler with minimal footprint. No refractory also means significantly lower weight (compared to traditional vertical steam boilers) for ease of installation.
Ultra-low NOx emissions of less than 20ppm are achieved thanks to the VSRT's combustion technology, which features a modulating burner and furnace that have been purposely-designed as a single component and fully-matched with the VSRT in mind. This has helped Fulton to achieve up to 10:1 turndown capabilities and industry-leading performance of >82.5% gross thermal efficiency and 99.75% steam quality at 8 bar. When correctly sized for applications, the exceptionally high turndown will result in savings above and beyond those gained from the stated efficiencies.
With features including a tubeless design, no internal refractory and revolutionary cyclonic air filtration, the VSRT is extremely easy to maintain and operate. For applications where contaminated air can reduce boiler uptime - such as laundry and dry cleaning - the VSRT's cyclonic air filter effectively separates debris and damaging particles from the combustion air and, because it won't clog over time, eliminates the need for replacement filters. Maintenance is further improved compared to other vertical boilers thanks to the VSRT's industrial control platform and easy access to the pressure vessel.
VSRT boilers are PURE Optimised and built to last as a reliable source of clean steam, providing cost savings and operator peace of mind for years to come.
- kW rating: 100 - 1250 kW
- Output (BHP): 10 - 125 BHP
- Output (kg/h): 160 - 1956 kg/h (F&A 100°C)
- Operating Pressure: 10.34 barg
- Industry Leading Efficiencies
- Hydrogen-Ready (hydrogen-natural gas blends up to 23%)
- Smallest Footprint in the Industry
- Fully-Wetted Pressure Vessel
- 10 Year Guarantee on Pressure Vessel
Want to read more about the VSRT in action? Click here for the latest case study.
The VSRT also caught the attention of the judges at several award ceremonies. Click below to read more:
- Downloads
- Drawings
VSRT-10-15 Drawing - 766.83 KB- VSRT-20-30 Drawing - 702.35 KB
- VSRT-40-50-60 Drawing - 883.72 KB
- VSRT-100-125 Drawing - 907.44 KB
- Sales Literature
- VSRT Brochure - 3.53 MB
- Technical Literature
- VSRT (10-60) Installation and Operation Manual - 9.31 MB
- VSRT (10-60) Technical Information - 1.59 MB
- VSRT (100-125) Installation and Operation Manual - 5.39 MB
- VSRT (100-125) Technical Information - 3.42 MB
- VSRT-10 Technical Data - 310.02 KB
- VSRT-15 Technical Data - 321.71 KB
- VSRT-20 Technical Data - 321.86 KB
- VSRT-30 Technical Data - 321.43 KB
- VSRT-40 Technical Data - 321.6 KB
- VSRT-50 Technical Data - 320.71 KB
- VSRT-60 Technical Data - 320.68 KB
- VSRT Emissions Data - 673.88 KB
- Drawings
Like the VSRT, Fulton’s VSRT-E hybrid boiler is a revolutionary innovation in steam boilers, combining cutting-edge design with sustainability to redefine efficiency in the sector.
The ultra-low NOx, high-efficiency VSRT-E seamlessly integrates a traditional gas-fired system (inc. Hydrogen blend) with electric steam raising capability, allowing operators to optimise energy use, reduce emissions, and offers an alternative to traditional dual fuel solutions.
Engineered for easy installation and operation, the VSRT-E features an intuitive control system and compact footprint. With thermal efficiencies of 82.5% (Gas) and 99% (Electric) and a steam dryness of 99.75%, it significantly lowers fuel consumption and operating costs.
Its hybrid capability enables users to switch between gas and electricity, balancing energy sources to minimise carbon impact and take advantage of off-peak tariffs, further enhancing cost-effectiveness. By reducing CO₂ emissions and promoting cleaner energy use, the VSRT-E actively supports national decarbonisation goals.
Designed with safety in mind, the VSRT-E incorporates advanced monitoring and diagnostic features, reducing operating risks whilst ensuring reliable performance. Its unique tubeless design contains no refractory and does not require a five-yearly NDT inspection, reducing maintenance requirements and potential down time.
As the industry navigates towards a sustainable future, the VSRT-E sets a new benchmark in innovation, offering efficiency, reliability, and environmental responsibility in a single, future-proof solution.
VSRT-E at a glance:
- A revolutionary hybrid steam boiler
- Combines the renowned gas-fired performance of the VSRT with zero-emissions electric heating
- Features electric elements positioned below the gas heat exchanger for optimal efficiency and seamless operation
- Proven reduction in fuel usage and carbon dioxide emissions
- Delivers up to 99% efficiency and zero Scope 1 emissions when powered by electricity
- Retains the VSRT’s compact footprint while setting a new standard in steam boiler innovation
- Designed to align with the future of sustainable steam plant technology
- A real dual-fuel alternative!
Click here to read more about the VSRT-E, Fulton's next generation for steam.
The renowned ‘J’ Series vertical gas- and oil-fired steam boilers includes eight models covering outputs from 96 to 960 kg/h. Its tubeless design, invented by Fulton, eliminates the coils and tubes traditionally used in steam raising plant and enables the Series ‘J’ to raise its full steam output in just 20 minutes. Its simple, compact design and robust construction from top quality materials makes them ideal for arduous applications in a wide range of industries and for numerous industrial, pharmaceutical, medical, food and beverage applications.
The design of the J Series boiler provides increased thermal efficiency, with reduced flue gas and casing temperatures. It is easy to service and maintain, with good access for cleaning and inspection of internal surfaces.
- 8 Models: 60kW – 600kW
- Output: 96 kg/h – 960 kg/h (F&A 100°C)
- Operating Pressure: 10.34 barg
- Modulating Burners Available, including retro fit modulating burners for 30J - 60J boilers
- Steam Output raised in Approx. 20 mins
- Compact Design
- Five Year Guarantee on Pressure Vessel
The three models in the JFS Series vertical range, which offers peak-rate outputs between 300 and 680 kg/h, are manufactured with larger pressure vessels to allow a much greater flash reserve to be stored. The combination of quality dry steam and flash steam capability makes the JFS ideal for applications such as autoclave sterilisers, food and pharmaceutical processing and a wide range of industrial and manufacturing uses where peak loads of steam are required.
- 3 Models: 60kW – 600kW
- Output (Steady State): 160 kg/h – 320 kg/h
- Output (Peak Demand): 300 kg/h – 680 kg/h
- Operating Pressure: 10.34 barg
The VMP steam boiler combines high output and efficiency with a small footprint and low maintenance (outputs range from 626 to 2348 kg/h; with a maximum fuel-to-steam operating efficiency of 85%). The seven-model range features Fulton’s latest innovation – multi-port thick walled pipes with removable, full-length turbulators – designed to provide uniform heat transfer and speed-up boiler start time.
The Schedule 80 constructed exhaust pipes also reduce maintenance by eliminating the need to replace worn or broken tubes. It also features a Fulton designed and manufactured LoNOx power burner that fires down the full length of the furnace, can be supplied with gas, oil or dual-fuel fired burners.
- Output: 400 kW - 1500 kW
- Output: 626 kg/h - 2348 kg/h
- Operating Pressure: 10.34 barg
- Efficiencies: Up to 84%
- No Tubes to Replace
- Small Footprint
- Compact Design
Developed in response to customer demand for higher capacities than the 2348 kg/h maximum for its vertical range, the nine-model RB/RBC range (with outputs ranging from 957 to 4787 kg/h) can be specified with matched multi-stage oil, modulating gas or dual-fuel burners as standard, with other burners available on request. The RB/RBC has been designed to provide superior performance, long life and low maintenance. It is highly efficient, safe and reliable and there are many unique design features that make it one of the most efficient and durable boilers available.
The boilers meet current and anticipated legislation and have been engineered to provide a substantial performance margin. They are constructed to BS2790, 1992 Class 1 standard with a maximum working pressure of 10.34 barg.
- 9 Models: 600kW – 3000kW
- Output: 957 kg/h – 4787 kg/h (F&A 100°C)
- Operating Pressure: 10.34 barg
- Matched Oil, Gas Burners
- Long Life
- Low Maintenance
- Full stainless steel cladding giving a smart appearance
- Removable access panels for weld inspections
- Industry leading thermal efficiencies