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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

Are Boiler Hot Water Storage Tanks a Necessity?

20th May, 2026 Guides

Are Boiler Hot Water Storage T...

You may be wondering, are hot water storage tanks essential to home heating and the runnin...

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Are Biomass Boilers Worth it?

20th May, 2026 Guides

Are Biomass Boilers Worth it?

Biomass boilers are a sustainable and eco-friendly style of heating solution that can help...

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Alternatives to Gas Boilers: What are Your Options?

20th May, 2026 Guides

Alternatives to Gas Boilers: W...

As the UK moves toward a low-carbon future, switching from traditional gas boilers is beco...

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Alpha E-Tec Plus Boiler Review

20th May, 2026 Reviews

Alpha E-Tec Plus Boiler Review

The Alpha E-Tec Plus Boiler is proving extermely popular, read through our expert opinion...

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Alpha E-Tec Hybrid Heat Pump

20th May, 2026 Advice

Alpha E-Tec Hybrid Heat Pump

You may have heard of a heat pump, you probably have heard of a boiler, you probably have...

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Alpha E-Tec Combi Boiler Review

20th May, 2026 Reviews

Alpha E-Tec Combi Boiler Revie...

Here we will review the Alpha E-Tec boiler, specifically in its capacity and whether or no...

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AI Technology in Home Heating: The Future of Efficiency?

20th May, 2026 Guides

AI Technology in Home Heating:...

Artificial Intelligence (AI) is changing home heating by introducing smarter, more efficie...

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Worcester Bosch Boiler E9 Fault

10th April, 2026 Guides

Worcester Bosch Boiler E9 Faul...

E9 usually means your Worcester boiler has overheated or is struggling to move heat throug...

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Biasi Boiler Error Codes - How To Fix

10th April, 2026 Guides

Biasi Boiler Error Codes - How...

Some Biasi boiler error codes can clear with a reset, but others point to faults that need...

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Vaillant F72 Error Code - How To Fix

10th April, 2026 Guides

Vaillant F72 Error Code - How...

F72 usually points to a sensor fault or poor circulation in the heating system.

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Unusual Boiler Smells: Causes and Fixes

10th April, 2026 Guides

Unusual Boiler Smells: Causes...

Some boiler smells are harmless, but gas and burning smells need urgent attention.

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Boiler Ticking Noise

09th April, 2026 Guides

Boiler Ticking Noise

A ticking boiler is often caused by pipe expansion, a timer, or parts heating up and cooli...

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