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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

What Is A MagnaCleanse?

30th May, 2025 Advice

What Is A MagnaCleanse?

The heating system in your home is a valuable tool that is used on a regular basis, most l...

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What is a Condensing Boiler?

30th May, 2025 Advice

What is a Condensing Boiler?

Condensing boilers are a type of boiler that was designed to deliver a highly efficient wa...

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What Is A Powerflush?

30th May, 2025 Advice

What Is A Powerflush?

A powerflush is a kind of cleaning process for your central heating system that can remove...

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What Is A Chemical Flush?

30th May, 2025 Advice

What Is A Chemical Flush?

Boiler maintenance can be a tricky process, and an advice guide can help a lot.

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How Much Does a Boiler Power Flush Cost?

30th May, 2025 Advice

How Much Does a Boiler Power F...

A power flush can be a very effective way to clean out your central heating system, but th...

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What Type of Boiler Do I Have?

30th May, 2025 Advice

What Type of Boiler Do I Have?

Despite over 22 million UK homes having gas central heating, a great deal of homeowners ar...

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Boiler Pilot Light Won't Stay Lit

30th May, 2025 Advice

Boiler Pilot Light Won't Stay...

If you own an older boiler, you might be familiar with the pilot light. The pilot light is...

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Which Boiler is Best for a 4 Bedroom Home?

30th May, 2025 Guides

Which Boiler is Best for a 4 B...

When your old boiler breaks down and it comes time to replace it with a new one, it might...

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The Best Smart Thermostats in the UK 2025

30th May, 2025 Guides

The Best Smart Thermostats in...

A smart thermostat can make a massive difference to your home and can be one of the best...

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Why Is My Shower Cold & Not Getting Hot?

30th May, 2025 Advice

Why Is My Shower Cold & Not Ge...

There’s nothing worse than expecting to have a nice warm shower… only to discover your wat...

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Central Heating Inhibitor

30th May, 2025 Advice

Central Heating Inhibitor

A central heating inhibitor can be a vital part of heating systems that many people forget...

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Condensing Boilers vs Combi Boilers

30th May, 2025 Comparisons

Condensing Boilers vs Combi Bo...

In this guide, we’re going to be explaining what each of these terms mean so you know exac...

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