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Stephen Day

Gas Safe Engineer at iHeat

Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling, and renewable energy industry, specialising in boiler installations, air conditioning, and heat pump systems.

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About Stephen Day

Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling and renewable energy industry.

Throughout his career, Stephen has designed, installed and maintained thousands of systems across homes and businesses in the UK. His background on the tools, combined with his directorship role at iHeat, gives him a rare understanding of both the technical and operational sides of the industry.

He has helped to secure Which? Trusted Trader accreditation all with a focus on delivering great service and long-term value for customers. He also writes for the iHeat blog, sharing practical advice and explaining heating topics in plain, helpful language.

Stephen continues to stay up to date with the latest heating technologies, building regulations and low-carbon innovations.

Gas Safe ID: 5910722

Expertise

  • Boiler systems and installation
  • Heat pumps and hybrid heating systems
  • Gas safety and compliance
  • System design
  • Renewable and low-carbon technologies
  • Technical training


Articles by Stephen Day are reviewed by iHeat’s technical team for accuracy and reliability.

Stephen Day's latest articles

Glow Worm Boiler Pressure

08th October, 2025 Guides

Glow Worm Boiler Pressure

To keep your Glow-Worm boiler working properly, it's essential to maintain the right press...

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Grundfos Central Heating Pump

08th October, 2025 Guides

Grundfos Central Heating Pump

A Grundfos central heating pump is an essential part of a boiler system in many UK homes....

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What Is An Expansion Vessel?

08th October, 2025 Guides

What Is An Expansion Vessel?

An expansion vessel is an essential component of a modern boiler system, serving a pivotal...

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What is a Tundish?

08th October, 2025 Guides

What is a Tundish?

A tundish is a small yet essential component found in heating systems, particularly in unv...

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F29 Vaillant Fault Code

07th October, 2025 Guides

F29 Vaillant Fault Code

The F29 Vaillant fault code is a frustrating problem that can cause your boiler to shut do...

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Heat Pump Repair - Troubleshooting And Maintenance Tips

07th October, 2025 Guides

Heat Pump Repair - Troubleshoo...

Regular maintenance is essential for a heat pump's longevity. Replacing dirty filters and...

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Ideal F2 Error Code - How to Fix

06th October, 2025 Guides

Ideal F2 Error Code - How to F...

If you're experiencing the Ideal F2 error code on your boiler, our guide can help. We expl...

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Baxi Boiler E125 Error Code

22nd September, 2025 Guides

Baxi Boiler E125 Error Code

Boiler systems are intricate and can exhibit a range of error codes that signal specific i...

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Are Heat Pumps More Efficient than Gas Boilers?

22nd September, 2025 Comparisons

Are Heat Pumps More Efficient...

This blog comprehensively compares heat pumps and gas boilers, focusing on their efficienc...

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Alpha E-Tec Hybrid Heat Pump

22nd September, 2025 Advice

Alpha E-Tec Hybrid Heat Pump

You may have heard of a heat pump, you probably have heard of a boiler, you probably have...

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Power Flush vs Chemical Flush

22nd September, 2025 Comparisons

Power Flush vs Chemical Flush

Both a power flush and chemical flush are forms of system cleaning you can use for your ce...

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Viessmann 222-F Boiler Review

19th September, 2025 Reviews

Viessmann 222-F Boiler Review

Viessmann is an international brand with over a century of trusted design and application,...

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