🔥 Bowman FG100-5115-2S Stainless Steel Heat Exchanger | 170kW Commercial Pool Heating
🌡️ High-Capacity British-Engineered Heat Transfer for Large Commercial & Institutional Pools
📋 Product Overview
The Bowman FG100-5115-2S is a premium shell and tube heat exchanger from EJ Bowman, backed by over 100 years of heat transfer technology expertise. Designed specifically for large commercial and institutional swimming pools up to 250m³ (55,000 gallons), this stainless steel model delivers exceptional heat transfer performance when connected to a boiler heat source.
Engineered in Birmingham, UK, this heat exchanger features robust stainless steel tube construction housed within a corrosion-resistant shell. The cast end covers are finished in Bowman’s advanced ‘C’ coat technology, providing superior corrosion resistance and long-term durability.
The FG100-5115-2S is ideal for freshwater pool installations where reliable, high-capacity heating is essential. Whether you’re heating a competition pool, leisure centre, or commercial training facility, this heat exchanger provides consistent, efficient heat transfer to maintain optimal water temperatures.
⭐ Key Features
✅ High Heat Transfer Capacity – Up to 170kW heat output at optimal flow rates with 82°C boiler water supply
✅ Durable Stainless Steel Tube Core – Robust construction for long-lasting performance in freshwater applications
✅ Advanced ‘C’ Coat End Covers – Highly corrosion-resistant coating technology on cast end covers
✅ Large Pool Capacity – Suitable for pools up to 250m³ (55,000 gallons)
✅ Flexible Installation – Can be mounted horizontally or vertically with included mounting brackets
✅ Easy Maintenance Access – Removable tube stack design for straightforward routine maintenance
✅ Integrated Thermostat Pocket – Built-in 7mm x 52mm thermostat pocket for temperature monitoring
✅ High Flow Capability – Maximum pool water flow rate of 33.0m³/h (550 l/min)
✅ 100 Years of British Engineering – Backed by EJ Bowman’s century of heat transfer expertise
🔧 Technical Specifications
| Specification | Details |
|---|---|
| Model Number | FG100-5115-2S |
| Tube Material | Stainless Steel |
| Shell Coating | ‘C’ Coat (Advanced Corrosion Resistant) |
| Typical Pool Capacity | 250m³ (55,000 gallons) |
| Typical Heat Transfer | 170kW (with boiler heating at optimal flow) |
| Maximum Pool Water Flow | 33.0m³/h (550 l/min) |
| Maximum Hot Water Temperature | 110°C (230°F) |
| Max Operating Pressure (Pool Water) | 6 bar (87 psi) |
| Max Operating Pressure (Hot Water) | 6 bar (87 psi) |
| Pool Water Connections | 2½” BSP |
| Hot Water Connections (Boiler) | 1¼” BSP |
| Thermostat Pocket | Ø7mm x 52mm depth |
| Overall Length | 470mm |
| Mounting Hole Centres | 294mm (length), 190mm x 160mm |
| Shell Diameter | 128mm |
| Weight (Dry) | 15kg |
| Manufacturer | EJ Bowman (Birmingham) Ltd, UK |
📊 Heat Transfer Performance
The Bowman FG100-5115-2S delivers variable heat transfer output depending on your boiler water temperature and flow rates. The following performance data is taken directly from the manufacturer documentation.
🔥 Heat Output at Different Boiler Temperatures
Based on pool water flow of 480 l/min at 28°C
| Hot Water Flow Rate | 82°C Boiler | 70°C Boiler | 60°C Boiler | 45°C Boiler |
|---|---|---|---|---|
| 40 l/min | 90 kW | 69 kW | 52 kW | 27 kW |
| 60 l/min | 114 kW | 87 kW | 65 kW | 34 kW |
| 80 l/min | 132 kW | 101 kW | 76 kW | 39 kW |
| 100 l/min | 147 kW | 113 kW | 85 kW | 44 kW |
| 120 l/min | 159 kW | 122 kW | 92 kW | 47 kW |
| 140 l/min | 170 kW | 130 kW | 98 kW | 51 kW |
⚡ Efficiency Factors
The heat exchanger’s performance is directly influenced by:
- Boiler water temperature – Higher temperatures deliver greater heat transfer
- Hot water flow rate – Optimal performance at 140 l/min on the primary circuit
- Pool water flow rate – Designed for flows up to 550 l/min on the secondary circuit
- Temperature differential – Greater difference between boiler and pool water increases efficiency
- Proper sizing – Matching the heat exchanger to your pool volume and heat source capacity
⚠️ Important: If flow rates on either the hot water supply or pool water circuit are too low, the heat exchanger will not perform at designed efficiency and will be unable to transfer all available heat energy into the pool water.
⏱️ Heat-Up Times & Temperature Maintenance
⚠️ Heat-up times vary based on multiple factors including:
- Heat source output (boiler kW rating)
- Starting water temperature
- Target water temperature
- Pool cover usage
- Ambient/outdoor temperature
- Heat exchanger sizing match
- Pool insulation quality
- Weather conditions and heat losses
🛡️ Material & Compatibility Guide
Stainless Steel Construction
The FG100-5115-2S features a stainless steel tube core, making it suitable for:
✅ Freshwater swimming pools
✅ Standard chlorinated pool water
✅ Indoor and outdoor pool installations
✅ Commercial and institutional facilities
✅ Boiler-fed heating systems
⚠️ Important Compatibility Warning
❌ NOT suitable for use with salt water chlorinators
❌ NOT suitable for salt water pools
For salt water or high-chlorine environments, consider the Bowman FG100-5115-2T (Titanium) or FG100-5115-2C (Cupro-Nickel) models instead.
Why Choose Stainless Steel?
Stainless steel offers excellent durability and heat transfer properties for freshwater applications at an economical price point. The material provides reliable corrosion resistance against standard pool chemicals while delivering efficient thermal performance.
🎯 Applications & Use Cases
The Bowman FG100-5115-2S is designed for demanding commercial applications:
🏊♂️ Large Commercial Pools – Competition pools, public swimming facilities, and municipal pools up to 250m³
🏢 Leisure Centres – Multi-pool complexes requiring reliable, high-capacity heating
🏋️ Training Facilities – Sports centres, athletic training pools, and rehabilitation pools
🎓 Institutional Pools – Schools, universities, and college swimming facilities
🏨 Hospitality – Hotels, resorts, and holiday parks with large freshwater pools
🔥 Boiler Integration – Designed specifically for connection to commercial boiler systems
☀️ Solar Thermal Systems – Compatible with solar heating integration (as secondary heat source)
🔨 Installation Considerations
Mounting Options
The FG100-5115-2S can be installed in either horizontal or vertical orientation, providing flexibility for various plant room configurations.
- Mounting brackets included with the unit
- Mounting hole centres: 294mm (length), 190mm x 160mm (width)
- Shell diameter: 128mm – ensure adequate clearance for maintenance access
Connection Requirements
- Pool Water Circuit: 2½” BSP connections
- Boiler/Hot Water Circuit: 1¼” BSP connections
- Thermostat Pocket: Ø7mm x 52mm for temperature sensor installation
Flow Direction
Correct flow direction is essential for optimal performance:
- Hot water enters and exits through the shell side (1¼” BSP)
- Pool water flows through the tube side (2½” BSP)
- Refer to manufacturer diagrams for inlet/outlet positions
Installation Best Practices
- Install isolation valves on both circuits for maintenance access
- Position the heat exchanger after the filter in the pool water circuit
- If using an automatic dosing system, install it after the heat exchanger on the return to the pool
- Ensure adequate water flow rates are maintained for optimal heat transfer
- Consider installing a non-return valve on the boiler circuit
⚠️ Professional Installation Recommended: For warranty compliance and optimal performance, we recommend installation by a qualified heating engineer or pool technician.
📥 Downloads & Resources
📄 Bowman FG100-5115-2 Product Brochure – Complete technical specifications, heat transfer tables, pressure drop data, and installation diagrams (PDF)
🏆 Why Choose Bowman Heat Exchangers
✅ 100 Years of British Engineering Excellence – EJ Bowman has been manufacturing heat transfer solutions in Birmingham, UK since 1922
✅ Premium Material Quality – Advanced ‘C’ coat technology and quality-controlled tube materials
✅ Proven Performance – Trusted by commercial pool operators, leisure centres, and institutions worldwide
✅ Comprehensive Range – Available in Titanium, Cupro-Nickel, and Stainless Steel to match any water type
✅ Designed for Longevity – Removable tube stack design enables easy maintenance and extends service life
✅ Technical Support – Backed by manufacturer expertise and detailed performance documentation
🛒 Why Buy from Parts4Tubs
✅ UK-Based Pool Heating Specialists – Expert knowledge of commercial and domestic pool heating systems
✅ Competitive Pricing – Trade and retail pricing on genuine Bowman products
✅ Technical Advice – Speak to our team for help selecting the right heat exchanger for your application
✅ Fast UK Delivery – Quick dispatch on in-stock items
✅ Genuine Products – Authorised supplier of authentic Bowman heat exchangers
✅ After-Sales Support – Continued assistance with installation queries and technical questions
✨ Summary
The Bowman FG100-5115-2S Stainless Steel Heat Exchanger delivers powerful, reliable heat transfer for large commercial freshwater pools up to 250m³. With up to 170kW heat output, flexible mounting options, and century-proven British engineering, this unit is the ideal choice for leisure centres, competition pools, and institutional facilities. Backed by Bowman’s advanced ‘C’ coat corrosion protection and designed for easy maintenance access, the FG100-5115-2S provides dependable performance season after season.









