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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

Understanding Your Boiler Settings & Controls Explained

20th May, 2026 Guides

Understanding Your Boiler Sett...

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

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EPH Combi Pack 4 Thermostat

20th May, 2026 Reviews

EPH Combi Pack 4 Thermostat

A modern and capable thermostat can often be overlooked as a key tool, synchronising with...

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Electric Central Heating Boiler

20th May, 2026 Guides

Electric Central Heating Boile...

While electric boilers do offer many advantages, it's essential to weigh these against the...

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Electric Boiler Service

20th May, 2026 Guides

Electric Boiler Service

Electric boilers are popular in many UK homes due to their efficiency and compatibility wi...

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Most Economical Way to Use Central Heating UK

20th May, 2026 Guides

Most Economical Way to Use Cen...

Leaving the heating on low all day might seem like a way to avoid the chill without bursti...

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Does Turning Down Radiators Save Gas & Money?

20th May, 2026 Guides

Does Turning Down Radiators Sa...

While it seems logical that using less heating could save money, the effectiveness of this...

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Combi Boilers vs Conventional Boilers

20th May, 2026 Guides

Combi Boilers vs Conventional...

Combi boilers, also known as combination boilers, are compact units that serve as both a c...

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Can A Combi Boiler Run Hot Water and Heating Simultaneously?

20th May, 2026 Advice

Can A Combi Boiler Run Hot Wat...

You’ve likely heard of a combi boiler before and you may even have one in your home, contr...

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Central Heating Inhibitor

20th May, 2026 Advice

Central Heating Inhibitor

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

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Do I Need a Carbon Monoxide Detector with a Combi Boiler

20th May, 2026 Guides

Do I Need a Carbon Monoxide De...

Boilers can produce carbon monoxide (CO), a dangerous and potentially deadly gas, through...

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Can Your Boiler Work Without Gas? Backup Heating Options for Your Home

20th May, 2026 Guides

Can Your Boiler Work Without G...

Standard boilers typically rely on gas as their primary fuel source. For homes without acc...

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Can a Boiler Explode?

20th May, 2026 Guides

Can a Boiler Explode?

Boilers are a key part of many homes, but they can pose risks if not properly maintained....

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