🔥 Bowman EC100-5113-2S Stainless Steel Heat Exchanger – 50kW (170,000 BTU)

🌡️ Premium British-Engineered Pool Heating with Professional-Grade Stainless Steel Construction

📋 Product Overview

The Bowman EC100-5113-2S is a professional-grade stainless steel heat exchanger delivering 50kW (170,000 BTU) of heat transfer capacity when paired with an 82°C boiler system. Manufactured by EJ Bowman in Birmingham, UK, this unit represents over 100 years of heat transfer expertise.

This versatile unit efficiently transfers heat from your boiler, heat pump, or solar thermal system to your pool water through its high-performance stainless steel tube stack. The shell-and-tube design maximises heat transfer surface area while maintaining a compact footprint, making it ideal for medium-sized domestic and light commercial swimming pools.

Designed for pools up to 90,000 litres (20,000 gallons), the EC100-5113-2S features Bowman’s innovative ‘Universal Fit’ end covers, allowing direct installation with both metric (50mm) and imperial (48mm/1.5″ NPS) pool pipework. This thoughtful engineering makes installation straightforward for professionals across the UK and Europe.

⭐ Key Features

✅ 50kW Heat Transfer Capacity – Delivers 170,000 BTU/hr with 82°C boiler water for rapid pool heating

✅ Premium Stainless Steel Tube Stack – Corrosion-resistant construction for chlorinated freshwater pools

✅ Suitable for Pools up to 90,000 Litres – Ideal for medium-sized domestic and light commercial installations

✅ Universal Fit End Covers – Compatible with both metric 50mm and imperial 1.5″ NPS pool pipework

✅ Integral Thermostat Pocket – Built-in 7mm x 40mm pocket for accurate pool water temperature monitoring

✅ Compact Lightweight Design – Only 4.5kg dry weight for easy handling and installation

✅ Flexible Mounting Options – Can be installed horizontally or vertically to suit your plant room layout

✅ Easy Maintenance Access – Removable end covers and tube stack for straightforward cleaning and servicing

✅ British Manufacturing Quality – Designed and built by EJ Bowman in Birmingham, UK

✅ 12 Month Manufacturer Warranty – Guaranteed against manufacturing faults

🔧 Technical Specifications

Specification	Details
Model Number	EC100-5113-2S
Heat Output (82°C Boiler Water)	50kW / 170,000 BTU/hr
Heat Output (60°C Boiler Water)	30kW / 102,000 BTU/hr
Shell Material	Cast Iron
Tube Stack Material	Stainless Steel
Max Pool Volume	90,000 litres / 20,000 gallons
Boiler Water Flow Rate	3.0 m³/h (50 l/min)
Max Pool Water Flow Rate	12.0 m³/h (200 l/min)
Max Operating Pressure (Both Sides)	6 bar
Max Operating Temperature (Heating Side)	110°C
Max Operating Temperature (Pool Side)	100°C
Pool Water Connections	Solvent Weld Ø48/Ø50mm (DN40 Pipe)
Boiler Water Connections	¾” BSP Threaded
Overall Length	456mm
Shell Diameter	86mm
Weight (Dry)	4.5 kg

📊 Heat Transfer Performance

The Bowman EC100-5113-2S delivers exceptional heat transfer performance, with output varying based on your heat source temperature:

🏊 Pool Heating Performance:

Heat Source Temperature	Heat Output	Pool Capacity
82°C (Boiler)	50kW / 170,000 BTU/hr	Up to 90,000 litres
60°C (Boiler/Heat Pump)	30kW / 102,000 BTU/hr	Up to 90,000 litres

⚡ Efficiency Factors:

• Counter-flow design – Pool water and heating water flow in opposite directions for maximum heat transfer efficiency
• Optimised flow rates – Boiler side: 3.0 m³/h | Pool side: up to 12.0 m³/h
• High tube density – More heat transfer tubes than many competitor products for faster heating
• Proper sizing – Match heat exchanger capacity to your heat source output for optimal performance

💡 Performance Note: Heat transfer rates shown are based on achieving a pool water temperature of 30°C. Actual performance depends on heat source output, flow rates, and temperature differentials.

⏱️ Heat-Up Times & Temperature Maintenance

⚠️ Important Information About Heating Times

Heat-up times vary significantly based on multiple factors, and the manufacturer documentation does not provide specific heating time calculations for this model. The following variables directly affect your pool heating performance:

Key Variables Affecting Heating Time:

• 🔥 Heat source capacity (kW/BTU rating of your boiler or heat pump)
• 🌡️ Starting water temperature
• 🎯 Target water temperature (desired temperature rise)
• 🏊 Pool volume and surface area
• 🛡️ Pool cover usage (reduces heat loss by up to 75%)
• 🌤️ Ambient/outdoor temperature and weather conditions
• 💨 Wind exposure and pool location
• 📐 Heat exchanger sizing match to heat source

General Guidance:

The EC100-5113-2S is designed to work efficiently with heat sources up to 50kW output. When properly matched with an appropriate boiler or heat pump:

• The unit can transfer up to 50kW of heat energy per hour (at 82°C input)
• Heat transfer efficiency is maximised with counter-flow installation
• Using a pool cover dramatically reduces heating time and energy consumption

ℹ️ Note: Heat exchangers are passive devices that transfer heat from your boiler or heat pump to pool water. Heating times are primarily determined by your heat source capacity, not the heat exchanger itself, provided the heat exchanger is correctly sized.

🛡️ Material & Compatibility Guide

Stainless Steel Construction – What You Need to Know

The EC100-5113-2S features a premium stainless steel tube stack, offering excellent durability and heat transfer properties for the right applications.

✅ Ideal For:

• Chlorinated freshwater swimming pools
• Standard pool chemical treatment systems
• Bromine-treated pools
• Domestic and light commercial installations
• Cost-effective long-term performance

❌ Not Suitable For:

• Salt water pools
• Salt water chlorinator systems
• High-chloride water environments

⚠️ Important: Stainless steel heat exchangers should NOT be used with salt water chlorinators or salt water pools. For these applications, please consider Bowman’s Titanium or Cupro-Nickel models.

Recommended Water Chemistry Limits (Stainless Steel):

Parameter	Recommended Range
Free Chlorine	1.0 – 3.0 ppm
pH Level	7.2 – 7.8
Calcium Hardness	200 – 1000 ppm
Alkalinity	100 – 150 ppm
Bromine	2.0 – 4.0 ppm
Chloride	Less than 350 ppm

Alternative Material Options:

Material	Best For	Key Benefit
Titanium	Salt water, salt chlorinators, all pool types	Ultimate corrosion resistance, 10-year guarantee
Cupro-Nickel	Chlorinated pools, moderate salt tolerance	Excellent durability, cost-effective
Stainless Steel	Freshwater chlorinated pools	Good performance, economical choice

🎯 Applications & Use Cases

The Bowman EC100-5113-2S is engineered for versatile pool heating applications:

🏊‍♂️ Domestic Swimming Pools Ideal for medium-sized home pools up to 90,000 litres, providing comfortable swimming temperatures throughout the season.

🏢 Light Commercial Installations Perfect for small hotel pools, holiday let properties, wellness centres, and spa facilities requiring reliable, professional-grade heating.

🔥 Boiler Integration Designed for seamless connection to gas, oil, or LPG boilers. Achieves maximum 50kW output with 82°C boiler water temperature.

☀️ Solar Thermal Systems Compatible with solar panel installations when water temperatures reach 60-82°C for effective heat transfer.

⚡ Heat Pump Connection Works efficiently with heat pump systems at 60°C water temperature, delivering 30kW heat transfer capacity.

🛁 Large Hot Tubs & Swim Spas Suitable for larger hydrotherapy installations requiring substantial heating capacity.

🏠 Extension of Swimming Season Enables comfortable pool use from early spring through late autumn with appropriate heat source sizing.

🔨 Installation Considerations

Professional Installation Recommended

To ensure optimal performance and maintain warranty coverage, professional installation by a qualified heating engineer is strongly recommended.

Mounting Options:

• ✅ Horizontal mounting (most common)
• ✅ Vertical mounting
• Both orientations supported – choose based on your plant room layout

Connection Requirements:

Connection	Specification
Pool Water Inlet/Outlet	Solvent weld Ø48mm or Ø50mm (DN40 pipe)
Boiler Water Inlet/Outlet	¾” BSP threaded

Critical Installation Points:

1. Counter-Flow Installation Required – Pool water must flow in the opposite direction to heating water for maximum efficiency. Failure to install in counter-flow arrangement will significantly reduce performance.
2. Thermostat Positioning – Install the thermostat in the integral pocket on the pool water inlet side for accurate temperature monitoring.
3. Chemical Dosing – Automatic dosing systems must be installed downstream (after) the heat exchanger, with a non-return valve fitted.
4. Isolation Valves – Fit isolation valves on all connections for maintenance access.
5. Frost Protection – Install in a frost-free location. If exposed to frost risk, drain the unit during winter shutdown.
6. Flow Rates – Do not exceed maximum pool water flow rate of 12.0 m³/h (200 l/min).
7. Debris Protection – Ensure the pool filtration system is functioning correctly before commissioning.

⚠️ Always refer to the manufacturer’s Installation, Operation & Maintenance Guide for complete installation instructions.

📥 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 British Engineering Excellence – EJ Bowman has been manufacturing heat exchangers in Birmingham since 1920, with unrivalled expertise in heat transfer technology.

✅ Global Industry Leader – Tens of thousands of Bowman units operate reliably around the world, from domestic spas to Olympic swimming pools.

✅ Superior Heat Transfer Performance – More heat transfer tubes than most competitor products, heating pools up to three times faster according to manufacturer testing.

✅ Premium Material Quality – Choice of stainless steel, cupro-nickel, or titanium tube stacks to match your exact water chemistry requirements.

✅ Proven Reliability & Durability – Designed and built to the highest quality standards with robust construction for years of dependable service.

✅ Easy Installation & Maintenance – Universal fit end covers, removable tube stacks, and accessible components simplify installation and ongoing servicing.

✅ Comprehensive Warranty – 12-month manufacturer guarantee against manufacturing faults, with 10-year guarantee available on titanium materials.

✅ ISO 9001 Certified Manufacturing – Quality management systems ensure consistent, reliable production standards (FM38224).

🛒 Why Buy From Parts4Tubs

✅ UK-Based Pool & Spa Specialists – Dedicated expertise in pool heating equipment and accessories.

✅ Genuine Bowman Products – Authorised stockist of authentic Bowman heat exchangers with full manufacturer support.

✅ Expert Technical Advice – Our team can help you select the right heat exchanger for your pool size and heat source.

✅ Competitive Pricing – Great value on premium quality equipment.

✅ Fast UK Delivery – Quick dispatch to get your pool heating project underway.

✅ After-Sales Support – Ongoing assistance with installation queries, spare parts, and technical questions.

✅ Easy Returns – Hassle-free returns policy for your peace of mind.

✨ Summary

The Bowman EC100-5113-2S represents the perfect balance of performance, quality, and value for medium-sized pool heating applications. With 50kW heat transfer capacity, premium stainless steel construction, and the backing of over 100 years of British manufacturing expertise, this heat exchanger delivers reliable, efficient heating for pools up to 90,000 litres.

Featuring Bowman’s innovative Universal Fit end covers for easy installation, compact lightweight design, and straightforward maintenance access, the EC100-5113-2S is the professional’s choice for chlorinated freshwater swimming pools. Trust Bowman – the world’s leading swimming pool heat exchanger manufacturer.