🔥 Bowman EC100-5113-2S Stainless Steel Heat Exchanger | 50kW / 170,000 BTU

🌡️ British-Engineered Pool Heating Excellence – Up to 3x Faster Heat Transfer for Medium-Sized Pools

📋 Product Overview

The Bowman EC100-5113-2S is a premium stainless steel swimming pool heat exchanger, designed and manufactured in Britain by EJ Bowman – a company with over 60 years of expertise in pool heating technology. This shell-and-tube heat exchanger efficiently transfers thermal energy from your boiler, heat pump, or solar system to your pool water through its high-performance stainless steel tube stack.

Delivering an impressive 50kW (170,000 BTU/h) with 82°C boiler water, the EC100-5113-2S heats pools up to three times faster than standard units thanks to its optimised tube design with more heat transfer surface area than competitors. The durable stainless steel construction provides excellent corrosion resistance for chlorinated freshwater pools, while the compact design with universal-fit end covers ensures straightforward installation in any plant room configuration.

Ideal for medium-sized residential and small commercial pools up to 90m³ (20,000 gallons), this heat exchanger combines rapid heating capability with the legendary Bowman reliability trusted by pool professionals worldwide.

⭐ Key Features

✅ High Heat Transfer Capacity – Delivers 50kW (170,000 BTU/h) with 82°C boiler water or 30kW (102,000 BTU/h) with 60°C boiler water for rapid pool heating

✅ Stainless Steel Tube Stack – Premium corrosion-resistant tubes designed for long service life in chlorinated freshwater applications

✅ Universal-Fit End Covers – Composite end covers accommodate both metric (Ø48/Ø50mm) and imperial (1½” NPS) pool pipework for versatile installation

✅ Compact Lightweight Design – Weighing just 4.5kg with a 456mm overall length, ideal for space-constrained plant rooms

✅ Flexible Mounting Options – Install horizontally or vertically with included mounting brackets (130mm centres)

✅ Integral Thermostat Pocket – Built-in 7mm thermostat pocket on inlet end for precise temperature monitoring and control

✅ Removable Tube Stack – Easy access for inspection, cleaning, and maintenance without disturbing pipework connections

✅ Counter-Flow Design – Optimised heat transfer efficiency through counter-flow water circulation

✅ High Pressure Rating – 6 bar maximum working pressure on both primary and secondary circuits

✅ British Manufacturing Quality – Designed and built by EJ Bowman in Birmingham, UK with over 100 years of heat transfer expertise

🔧 Technical Specifications

Specification	Details
Model Number	EC100-5113-2S
Heat Output (82°C Boiler Water)	50 kW / 170,000 BTU/h
Heat Output (60°C Boiler Water)	30 kW / 102,000 BTU/h
Shell Material	Composite End Covers with Cast Iron Body
Tube Material	Stainless Steel
Max Pool Volume	90 m³ / 20,000 gallons
Primary (Boiler) Flow Rate	3.0 m³/h (50 l/min)
Secondary (Pool) Flow Rate	12.0 m³/h (200 l/min) maximum
Max Operating Pressure	6 bar (both circuits)
Max Operating Temperature	110°C (heating side) / 100°C (pool side)
Primary Connections	3/4″ BSP threaded (inlet & outlet)
Secondary Connections	Solvent Weld Ø48/Ø50mm (Universal Fit)
Overall Length	456 mm
Body Diameter	86 mm
Mounting Centres	130 mm
Thermostat Pocket	Ø7mm x 40mm deep (inlet end)
Weight (Dry)	4.5 kg

📊 Heat Transfer Performance

🏊 Pool Heating Capacity

The EC100-5113-2S delivers substantial heating performance that scales with your heat source temperature:

Heat Source Temperature	Heat Transfer Rate	Suitable Pool Volume
82°C (Gas/Oil Boiler)	50 kW (170,000 BTU/h)	Up to 90 m³ (20,000 gal)
60°C (Condensing Boiler)	30 kW (102,000 BTU/h)	Up to 90 m³ (20,000 gal)

⚡ Efficiency Factors

The heat exchanger’s performance is optimised when:

• Primary (boiler) flow rate maintained at 3.0 m³/h (50 l/min)
• Pool water flow rate within the 12.0 m³/h (200 l/min) maximum
• Counter-flow installation correctly configured
• Temperature differential maximised between heat source and pool water

ℹ️ Note: Heat transfer rates are based on achieving a pool water temperature of 30°C as per manufacturer testing conditions.

⏱️ Heat-Up Times & Temperature Maintenance

⚠️ Heat-up times vary based on multiple factors including:

• Heat source output (boiler/heat pump kW rating)
• Starting water temperature
• Target water temperature
• Pool cover usage and insulation
• Ambient/outdoor temperature
• Weather conditions and heat losses
• Heat exchanger sizing match to system

The manufacturer documentation provides heat transfer capacity ratings but does not include specific heat-up time calculations, as these depend entirely on your individual installation parameters.

🛡️ Material & Compatibility Guide

Stainless Steel Construction

The EC100-5113-2S features a stainless steel tube stack which offers:

✅ Excellent heat transfer properties

✅ Good corrosion resistance in freshwater applications

✅ Cost-effective durability for standard pool environments

✅ Easy maintenance and cleaning

Water Chemistry Requirements

To ensure optimal performance and longevity, maintain the following water chemistry parameters:

Parameter	Required Range
pH Level	7.2 – 7.8
Free Chlorine	1.0 – 3.0 ppm
Bromine	2.0 – 4.0 ppm
Calcium Hardness	200 – 1,000 ppm
Alkalinity	100 – 150 ppm
Chloride	Less than 350 ppm

⚠️ Important Compatibility Warning

❌ NOT suitable for salt water pools

❌ NOT suitable for use with salt water chlorinators

❌ NOT suitable for saline-treated pools

For salt water or chlorinator applications, consider the Titanium (EC100-5113-2T) or Cupro-Nickel (EC100-5113-2C) variants which offer superior resistance to chloride attack.

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🎯 Applications & Use Cases

The Bowman EC100-5113-2S is ideally suited for:

🏊‍♂️ Medium-Sized Swimming Pools – Residential and small commercial pools up to 90m³ (20,000 gallons) capacity

🛁 Hot Tubs & Spas – Rapid heating for spa installations with compatible water chemistry

🔥 Gas & Oil Boiler Systems – Direct connection to traditional heating boilers via 3/4″ BSP connections

🌡️ Condensing Boiler Integration – Efficient operation even with lower 60°C flow temperatures

☀️ Solar Thermal Systems – Secondary heating boost when used alongside solar collectors

⚡ Heat Pump Connections – Compatible with air-source and ground-source heat pump installations

🏢 Small Commercial Facilities – Hotel pools, holiday lets, and leisure centres with freshwater systems

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🔨 Installation Considerations

Mounting Options

The EC100-5113-2S can be installed:

• Horizontally – Most common configuration for plant rooms
• Vertically – Space-saving option where floor space is limited

Mounting brackets are included with Ø7mm holes at 130mm centres.

Connection Requirements

• Pool Water (Secondary): Solvent weld connection for Ø48mm or Ø50mm pipe (DN40) – Universal-fit end covers accommodate both metric and imperial pipework
• Boiler Water (Primary): 3/4″ BSP threaded connections for inlet and outlet

Critical Installation Points

⚠️ Counter-Flow Configuration Required – The heat exchanger MUST be installed in counter-flow arrangement (pool water flowing opposite direction to heating water) for optimal performance. Failure to install correctly will significantly reduce heat transfer efficiency.

⚠️ Chemical Dosing Position – Automatic dosing systems must be installed DOWNSTREAM of the heat exchanger with a non-return valve to prevent chemical attack on the tube stack.

⚠️ Thermostat Position – Install the controlling thermostat in the pool water pipe BEFORE the heat exchanger inlet for accurate temperature regulation.

⚠️ Frost Protection – Install in a frost-free location. Drain completely if the installation may be exposed to freezing temperatures during winter shutdown.

⚠️ Professional Installation Recommended – For warranty compliance and optimal performance, professional installation by a qualified plumber or pool engineer is strongly recommended.

📥 Downloads & Resources

 Swimming Pool Heat Exchanger Brochure – Complete product range specifications and performance data (PDF)

 Installation, Operation & Maintenance Guide – Full technical installation instructions and maintenance procedures (PDF)

🏆 Why Choose Bowman Heat Exchangers

✅ 100 Years of Heat Transfer Expertise – EJ Bowman has been engineering heat transfer solutions since the early 20th century, bringing unmatched experience to pool heating

✅ British Manufacturing Quality – Designed and manufactured in Birmingham, UK to the highest quality standards

✅ Industry-Leading Performance – More heat transfer tubes than competitors delivers up to 3x faster heating

✅ Tens of Thousands in Service Worldwide – Proven reliability from domestic spas to Olympic swimming pools

✅ Comprehensive Warranty – 12 months warranty against manufacturing defects

✅ Full Spare Parts Availability – All replacement components readily available including tube stacks, O-seals, and end covers

✅ Choice of Materials – Stainless steel, cupro-nickel, and titanium options to suit every water type and budget

🛒 Why Buy from Parts4Tubs

✅ UK-Based Pool Heating Specialists – Expert knowledge of Bowman heat exchangers and pool heating systems

✅ Competitive Pricing – Great value on genuine Bowman products

✅ Fast UK Delivery – Quick dispatch to get your pool heating operational

✅ Technical Support – Friendly advice on product selection, sizing, and installation

✅ Genuine Bowman Products – Authorised stockist of authentic Bowman heat exchangers and spare parts

✅ After-Sales Service – Ongoing support for maintenance, spare parts, and troubleshooting

✨ Summary

The Bowman EC100-5113-2S Stainless Steel Heat Exchanger delivers professional-grade pool heating performance in a compact, reliable package. With 50kW heat transfer capacity, British manufacturing quality, and the trusted Bowman name behind it, this heat exchanger provides the efficient, durable solution your medium-sized pool deserves. The universal-fit design and flexible mounting options ensure straightforward installation, while the removable tube stack guarantees easy long-term maintenance.

Perfect for chlorinated freshwater pools up to 90m³ seeking fast, efficient heating from boilers and heat pumps.