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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

Boiler Brands To Avoid - Worst Boilers in 2026

20th May, 2026 Guides

Boiler Brands To Avoid - Worst...

This guide covers the boiler brands most often flagged as higher risk, plus the key warnin...

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The History Of Worcester Bosch Boilers

20th May, 2026 Guides

The History Of Worcester Bosch...

In this blog we will take a look at the rich lineage of the brand, and how Worcester Bosch...

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Worcester Bosch Combi Boiler Costs

20th May, 2026 Guides

Worcester Bosch Combi Boiler C...

With the colder months quickly approaching (sigh), a new, efficient Worcester Bosch combi...

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Worcester Bosch Boilers Reviews

20th May, 2026 Reviews

Worcester Bosch Boilers Review...

Worcester Bosch's 2026 boiler range extends its legacy of providing high-quality heating s...

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Worcester Bosch Boiler Control Panel

20th May, 2026 Guides

Worcester Bosch Boiler Control...

Digital Controls are intuitive interfaces that allow homeowners to manage their heating sc...

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Worcester Bosch A21 Error Code - How To Fix

20th May, 2026 Guides

Worcester Bosch A21 Error Code...

If Your Worcester Bosch boiler is displaying an A21 error code it can be a vexing issue, e...

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Worcester Bosch 8000 Boiler Review

20th May, 2026 Reviews

Worcester Bosch 8000 Boiler Re...

The Worcester Bosch 8000 boiler comes straight from one of the UK's best-selling boiler br...

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Worcester Bosch Boiler Reset

20th May, 2026 Guides

Worcester Bosch Boiler Reset

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

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Why Is My Boiler Whistling?

20th May, 2026 Guides

Why Is My Boiler Whistling?

The persistent whistling from your boiler is more than just a nuisance; it signals underly...

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Why is My Boiler Making a Loud Vibrating Noise?

20th May, 2026 Guides

Why is My Boiler Making a Loud...

Several factors can lead to a boiler making loud vibrating noises. It's crucial to pinpoin...

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Is Air Conditioning Worth It in the UK?

20th May, 2026 Advice

Is Air Conditioning Worth It i...

Air conditioning is worth it in the UK when overheating becomes a regular problem.

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Why Does My Boiler Fire Up in the Night?

20th May, 2026 Guides

Why Does My Boiler Fire Up in...

Occasionally, boilers turn on during the night due to specific triggers. These include the...

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