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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

No Power to Boiler

17th November, 2025 Guides

No Power to Boiler

Find out why your boiler has no power and the key checks you can safely do before calling...

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Why is My Boiler Not Working?

17th November, 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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Types Of Air Conditioning - Options For UK Homes

17th November, 2025 Advice

Types Of Air Conditioning - Op...

This guide helps you choose the best type of air conditioning for your UK home.

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The Best Air Source Heat Pumps 2025

14th November, 2025 Advice

The Best Air Source Heat Pumps...

This guide outlines the best air source heat pumps for UK homes in 2025 and what to know b...

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How Much Does a Boiler Power Flush Cost?

14th November, 2025 Advice

How Much Does a Boiler Power F...

A boiler power flush in the UK typically costs £300 to £600. It’s a one-time cleaning that...

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Clean Heat Market Mechanism (CHMM) 2025: Updated

14th November, 2025 News

Clean Heat Market Mechanism (C...

The Clean Heat Market Mechanism is a UK policy making boiler manufacturers sell more heat...

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Common Alpha Boiler Error Codes

12th November, 2025 Guides

Common Alpha Boiler Error Code...

If your Alpha boiler is showing an error code, this guide explains what each one means, wh...

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Best Electric Boilers 2025

07th November, 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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Best Electric Combi Boiler

07th November, 2025 Guides

Best Electric Combi Boiler

Find out which electric combi boilers are the most efficient and reliable in the UK for 20...

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How long does it take to fit a new boiler?

07th November, 2025 Guides

How long does it take to fit a...

Most boiler installations take between one and two days depending on your current setup an...

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Radiators Not Heating Up: How to Fix?

07th November, 2025 Guides

Radiators Not Heating Up: How...

If your radiators aren’t heating up, it’s usually caused by trapped air, sludge, or a boil...

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Can a Boiler Lose Pressure Without a Leak?

07th November, 2025 Guides

Can a Boiler Lose Pressure Wit...

If your boiler keeps losing pressure but you can’t see a leak, it could be caused by trapp...

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