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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

Alpha E-Tec NX Combi Boiler Review

04th September, 2025 Reviews

Alpha E-Tec NX Combi Boiler Re...

As a leading online boiler installation company, iHeat is committed to providing customers...

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The Best LPG Combi Boilers 2025

21st August, 2025 Guides

The Best LPG Combi Boilers 202...

You may have heard of LPG boilers before, but even if you are not familiar with them, they...

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Best Oil Boilers 2025

21st August, 2025 Guides

Best Oil Boilers 2025

Various benefits come from having an oil boiler installed in your home, and this could be...

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Best Electric Boilers 2025

21st August, 2025 Guides

Best Electric Boilers 2025

Most homes in the United Kingdom have been relying on gas for heating and hot water for de...

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Central Heating System

15th August, 2025 Guides

Central Heating System

Central heating is almost always necessary, but that does not stop it from being hard to c...

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Worcester Bosch Greenstar CDi Compact Combi Review

15th August, 2025 Reviews

Worcester Bosch Greenstar CDi...

One of the most popular compact combi boilers on the market, here we take an in depth look...

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Worcester Bosch Boiler Reset

15th August, 2025 Guides

Worcester Bosch Boiler Reset

In tackling the nuances of Worcester boilers, it is imperative for homeowners to acquaint...

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What Is A Condensate Pipe?

15th August, 2025 Advice

What Is A Condensate Pipe?

The condensate pipe allows water to be safely drained away from your home, let's drill int...

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Vaillant Ecotec Pro Review

15th August, 2025 Guides

Vaillant Ecotec Pro Review

Vaillant's Ecotec Pro combi boiler series is renowned for providing efficient heating and...

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Navien Boiler Reviews

15th August, 2025 Reviews

Navien Boiler Reviews

Navien, a revered boiler manufacturer, has established a reputation for innovation and rel...

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Ideal Boilers Reviews

15th August, 2025 Reviews

Ideal Boilers Reviews

Ideal Boilers, with over a century of operation, has solidified its position as a venerabl...

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Fix a Frozen Boiler Condensate Pipe

15th August, 2025 Advice

Fix a Frozen Boiler Condensate...

A frozen condensate pipe can be a pesky nuisance which can affect the overall performance...

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