🔥 Bowman EC80-5113-1S Stainless Steel Heat Exchanger | 25kW (85,000 BTU/h)

🌡️ Compact, High-Efficiency Pool & Spa Heating – British-Engineered for Rapid Heat Transfer

📋 Product Overview

The Bowman EC80-5113-1S is a compact yet highly efficient stainless steel heat exchanger, purpose-built for heating domestic swimming pools, spas, and hot tubs up to 50m³ (11,000 gallons). Engineered by EJ Bowman – a British manufacturer with over 100 years of heat transfer expertise – this unit delivers exceptional heat transfer performance in a surprisingly small package.

Featuring a robust stainless steel tube core and innovative ‘Universal Fit’ composite end covers, the EC80-5113-1S integrates seamlessly into both imperial (1.5″) and metric (50mm) pool pipework systems. The removable tube stack design ensures straightforward maintenance access, while the integrated thermostat pocket allows for precise temperature monitoring.

Ideal for residential pool owners seeking a reliable, economical heating solution when paired with a boiler or compatible heat source. The EC80-5113-1S offers proven performance that heats spas and hot tubs extremely fast, helping to reduce energy costs over time.

⭐ Key Features

✅ High-Efficiency Heat Transfer – Delivers up to 25kW (85,000 BTU/h) at 82°C boiler temperature with optimal flow rates

✅ Quality Stainless Steel Construction – Durable tube core built to withstand demanding pool heating applications

✅ Universal Fit End Covers – Composite end covers accommodate both 1.5″ (48mm O/D) and metric 50mm O/D pipework

✅ Compact & Lightweight Design – Weighs just 3.0kg with a total length of only 371mm for easy installation

✅ Flexible Mounting Options – Install horizontally or vertically to suit your plant room layout

✅ Integrated Thermostat Pocket – Ø7 x 40mm pocket on inlet end for accurate temperature monitoring

✅ Easy Maintenance Access – Removable tube stack and accessible end covers simplify routine servicing

✅ Maximum Operating Pressure – Rated to 6 bar (87 psi) on both pool water and heating water circuits

✅ High Temperature Tolerance – Handles hot water temperatures up to 110°C (230°F)

✅ Solvent Weld Connections – Simple, leak-free integration into pool pipework systems

🔧 Technical Specifications

Specification	Details
Model Number	EC80-5113-1S
Tube Material	Stainless Steel
Typical Heat Transfer	25kW (85,000 BTU/h) at 82°C boiler temp
Heat Transfer at 60°C	15kW (51,000 BTU/h)
Maximum Pool Volume	50m³ (11,000 gallons)
Maximum Pool Water Flow	12.0 m³/h (200 l/min)
Hot Water Flow Range	10-60 l/min (optimal performance at 50-60 l/min)
Max Operating Pressure (Pool Water)	6 bar (87 psi)
Max Operating Pressure (Hot Water)	6 bar (87 psi)
Max Hot Water Temperature	110°C (230°F)
Connections (Hot Water)	3/4″ BSP inlet and outlet
Connections (Pool Water)	50mm (metric) or 1.5″ nominal (48mm O/D)
Thermostat Pocket	Ø7 x 40mm (inlet end only)
Total Length	371mm
Mounting Hole Centres	130mm
Mounting Hole Diameter	Ø7mm
Weight (Dry)	3.0 kg

📊 Heat Transfer Performance

The EC80-5113-1S delivers variable heat transfer output depending on your boiler temperature and flow rates. Proper flow management is essential for optimal performance.

🔥 Heat Output by Boiler Temperature

Pool water flow: 200 l/min at 28°C

Hot Water Flow	82°C Boiler	70°C Boiler	60°C Boiler	45°C Boiler
10 l/min	13 kW	10 kW	7 kW	4 kW
20 l/min	18 kW	13 kW	10 kW	5 kW
30 l/min	21 kW	16 kW	12 kW	6 kW
40 l/min	23 kW	17 kW	13 kW	7 kW
50 l/min	24 kW	19 kW	14 kW	7 kW
60 l/min	26 kW	20 kW	15 kW	8 kW

⚡ Efficiency Factors

• Flow Rate Optimisation – Higher flow rates on both circuits significantly improve heat transfer efficiency
• Temperature Differential – Greater temperature difference between boiler water and pool water increases heat transfer rate
• Proper Sizing – Ensure your boiler output matches the heat exchanger capacity for optimal results

⚠️ Important: If flow rates are too low on either the hot water supply or pool water circuit, the heat exchanger will not perform at designed efficiency and cannot transfer all available heat energy into the pool water.

⏱️ Heat-Up Times & Temperature Maintenance

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

• Heat source output (boiler kW rating)
• Starting water temperature
• Target water temperature
• Pool cover usage (essential for heat retention)
• Ambient/outdoor temperature
• Weather and wind conditions
• Pool insulation quality

💡 What We Can Tell You

Based on manufacturer data, the EC80-5113-1S:

• Delivers up to 25kW of heat transfer when connected to an 82°C boiler with optimal flow rates
• Is rated for pools up to 50m³ (11,000 gallons)
• Heats spas and hot tubs extremely fast according to Bowman’s product documentation

📐 Calculating Your Heat-Up Time

Heat-up time depends on your specific setup. The key variables are:

1. Your boiler’s kW output – This determines how much heat is available to transfer
2. Pool volume in litres – Larger pools take longer to heat
3. Temperature rise required – Heating from 15°C to 28°C requires more energy than 20°C to 28°C
4. Heat losses – Uncovered outdoor pools lose heat rapidly

ℹ️ Note: For accurate calculations tailored to your specific installation, please contact our technical team. We can help you determine realistic heating expectations based on your boiler capacity, pool size, and conditions.

🛡️ Material & Compatibility Guide

Stainless Steel Construction

The EC80-5113-1S features a stainless steel tube core, offering:

✅ Suitable for freshwater chlorinated pools – Compatible with standard pool chemical treatments

✅ Good heat transfer properties – Efficient thermal conductivity for effective pool heating

✅ Durable construction – Robust material resistant to standard pool water conditions

✅ Cost-effective option – Excellent performance at an economical price point

⚠️ Important Compatibility Notice

❌ NOT suitable for salt water pools

❌ NOT suitable for pools with salt water chlorinators

This stainless steel model is not recommended for use with chlorinators or salt water pools. For salt water applications, consider the Bowman EC80-5113-1T Titanium model or EC80-5113-1C Cupro-Nickel model.

Alternative Models in the EC80 Range

Model	Tube Material	Max Pool Volume	Salt Water Compatible
EC80-5113-1S	Stainless Steel	50m³ (11,000 gal)	❌ No
EC80-5113-1C	Cupro-Nickel	40m³ (8,800 gal)	✅ Yes
EC80-5113-1T	Titanium	60m³ (11,000 gal)	✅ Yes

🎯 Applications & Use Cases

The Bowman EC80-5113-1S is designed for a range of residential and light commercial heating applications:

🏊‍♂️ Domestic Swimming Pools – Ideal for freshwater pools up to 50m³ (11,000 gallons)

🛁 Spas & Hot Tubs – Rapid heating capability makes it perfect for spa installations

🔥 Boiler-Fed Systems – Designed specifically for connection to domestic boilers

☀️ Solar Thermal Integration – Can be used with solar heating systems where water temperatures permit

🏠 Indoor Pool Facilities – Compact size suits plant rooms with limited space

Heat Source Compatibility

The EC80-5113-1S works with various heat sources:

• Gas boilers
• Oil boilers
• Biomass boilers
• Heat pumps (where output temperatures are sufficient)
• Solar thermal systems

🔨 Installation Considerations

Mounting Options

The EC80-5113-1S can be installed in either orientation:

✅ Horizontal mounting – Standard installation position

✅ Vertical mounting – Alternative option where space requires

Connection Requirements

• Hot Water (Shell Side): 3/4″ BSP threaded connections
• Pool Water (Tube Side): Universal Fit end covers accept 1.5″ nominal (48mm O/D) or metric 50mm O/D pipework
• Solvent weld connections for secure, leak-free installation

Flow Direction

⚠️ Critical: Ensure correct flow direction as indicated on the unit:

• Hot water inlet and outlet clearly marked
• Pool water flows through the tube side

Installation Tips

• Position isolation valves on both circuits for easy maintenance access
• Install after the pool filter on the return to pool
• If using an automatic dosing system, install it after the heat exchanger
• Ensure adequate flow rates on both circuits for optimal performance
• Include a non-return valve in the system as shown in manufacturer diagrams

Space Requirements

• Total length: 371mm
• Mounting hole centres: 130mm
• Allow adequate clearance for end cover removal during maintenance

⚠️ Professional Installation Recommended: For warranty compliance and optimal performance, we recommend installation by a qualified heating engineer or pool technician.

📥 Downloads & Resources

📄 EC80-5113-1 Product Profile – Complete technical specifications, dimensions, and heat transfer data (PDF)

🏆 Why Choose Bowman Heat Exchangers

✅ 100 Years of Heat Transfer Expertise – EJ Bowman has been engineering heat exchangers since the early 1900s

✅ British Manufacturing Quality – Designed and manufactured in Birmingham, UK

✅ Proven Performance – Trusted by pool professionals and installers worldwide

✅ Comprehensive Range – Multiple material options (Titanium, Cupro-Nickel, Stainless Steel) to suit every application

✅ Titanium Model Warranty – 10-year warranty on titanium materials (applies to EC80-5113-1T)

✅ Reliable After-Sales Support – Backed by manufacturer technical expertise

🛒 Why Buy from Parts4Tubs

✅ UK-Based Pool Heating Specialists – Expert knowledge of pool and spa heating systems

✅ Authorised Bowman Stockist – Genuine products with full manufacturer support

✅ Technical Advice Available – Help with sizing, compatibility, and installation queries

✅ Fast UK Delivery – Quick dispatch on in-stock items

✅ Competitive Pricing – Quality products at fair prices

✅ After-Sales Support – Ongoing help with your heating system

✨ Summary

The Bowman EC80-5113-1S Stainless Steel Heat Exchanger delivers efficient, reliable pool heating in a remarkably compact package. With up to 25kW heat transfer capacity, universal-fit connections, and flexible mounting options, it’s the ideal choice for domestic pools and spas up to 50m³. Backed by Bowman’s century of heat transfer expertise and British manufacturing quality, this unit offers proven performance for freshwater pool owners seeking an economical heating solution.

Not suitable for salt water pools – see Titanium or Cupro-Nickel models for salt water applications.