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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

When Does a New Boiler Need Its First Service?

30th May, 2025 Advice

When Does a New Boiler Need It...

Having your boiler serviced regularly is important for ensuring its safety and efficiency,...

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How Long Does a Boiler Service Take?

30th May, 2025 Advice

How Long Does a Boiler Service...

A boiler service is an important part of boiler maintenance, helping to ensure that your h...

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Boiler Flow Temperature

30th May, 2025 Guides

Boiler Flow Temperature

Boiler flow temperature is an important factor in the performance and efficiency of your h...

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Understanding Your Boiler Settings & Controls Explained

30th May, 2025 Guides

Understanding Your Boiler Sett...

Boiler settings play a crucial role in the performance and efficiency of your heating syst...

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Winter Radiator Checks

30th May, 2025 Guides

Winter Radiator Checks

Winter radiator checks are an essential part of preparing your heating system for the cold...

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Baxi 830 Combi Boiler Review

30th May, 2025 Guides

Baxi 830 Combi Boiler Review

The Baxi 830 combi boiler is a compact and efficient heating system that offers excellent...

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How Much Money Can a New Boiler Save Me?

30th May, 2025 Guides

How Much Money Can a New Boile...

Installing a new boiler can help you save money on your energy bills while improving the e...

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Are Biomass Boilers Worth it?

30th May, 2025 Guides

Are Biomass Boilers Worth it?

Biomass boilers are a sustainable and eco-friendly style of heating solution that can help...

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What is Boiler Frost Protection?

30th May, 2025 Guides

What is Boiler Frost Protectio...

Boiler frost protection is an important feature that helps prevent your boiler from freezi...

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UK Homeowners Get More Time: Gas Boiler Ban Update 2035

30th May, 2025 News

UK Homeowners Get More Time: G...

The latest announcement from PM Rishi Sunak has informed the general public that modern an...

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Vaillant F72 Error Code - How To Fix

30th May, 2025 Guides

Vaillant F72 Error Code - How...

If you're experiencing the Vaillant F72 error code on your boiler, our guide can help. We...

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Boiler Parts and Their Functions

30th May, 2025 Guides

Boiler Parts and Their Functio...

Understanding the different parts of a boiler and their functions is essential for homeown...

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