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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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

Boiler Ticking Noise

30th May, 2025 Guides

Boiler Ticking Noise

When a boiler starts making a ticking noise, it's crucial to carefully examine the source...

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Vokera Boiler Error Codes - How To Fix

30th May, 2025 Guides

Vokera Boiler Error Codes - Ho...

Familiarising yourself with common Vokera fault codes and their meanings can be crucial in...

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Why is My Boiler Not Working?

30th May, 2025 Guides

Why is My Boiler Not Working?

Maintaining a boiler in good working order is essential for its efficiency and longevity....

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ATAG Boiler Error Codes - How To Fix

30th May, 2025 Guides

ATAG Boiler Error Codes - How...

When an ATAG boiler displays an error code, the meaning behind each code provides insight...

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Ideal L-F Error Code - How To Fix

30th May, 2025 Guides

Ideal L-F Error Code - How To...

When an Ideal boiler displays the L-F fault code, it is indicative of a flame loss issue....

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Biasi Boiler Error Codes - How To Fix

30th May, 2025 Guides

Biasi Boiler Error Codes - How...

Understanding the error codes on your Biasi boiler is the first step in troubleshooting. S...

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Vaillant F49 Boiler Error Code - How To Fix

30th May, 2025 Guides

Vaillant F49 Boiler Error Code...

The Vaillant F49 error code is a specific fault indicator on Vaillant boilers, signifying...

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Why Won't My Boiler Turn On?

30th May, 2025 Guides

Why Won't My Boiler Turn On?

Boilers are complex systems, and pinpointing the exact reason for failure can sometimes be...

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What is Boiler Modulation?

30th May, 2025 Guides

What is Boiler Modulation?

A modulating boiler not only adjusts its output to meet the varying heat demands of your h...

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iHeat Awarded Iconic Which? Trusted Trader Accreditation

30th May, 2025 News

iHeat Awarded Iconic Which? Tr...

Receiving the Which? Trusted Trader Accreditation is just the beginning. At iHeat, we unde...

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Electric Space Heaters - Bad Idea?

30th May, 2025 Guides

Electric Space Heaters - Bad I...

Gas heating systems are often more economical for households as natural gas is generally c...

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Ideal F7 Error Code - How To Fix

30th May, 2025 Guides

Ideal F7 Error Code - How To F...

Understanding the Ideal F7 error code is vital for diagnosing the issue and applying the a...

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