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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

Most Energy Efficient Boilers in 2025 (UK Guide)

08th August, 2025 Guides

Most Energy Efficient Boilers...

The efficiency of your boiler may not be something you pay much attention to, but is it co...

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Which Worcester Bosch Boiler is Best?

08th August, 2025 Comparisons

Which Worcester Bosch Boiler i...

Choosing the right boiler for your property is crucial to ensure optimal heating efficienc...

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Boiler Brands To Avoid - Worst Boilers in 2025

08th August, 2025 Guides

Boiler Brands To Avoid - Worst...

Looking for a guide to which boilers you shouldn’t buy? Look no further.

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Ideal vs Worcester Bosch Boilers

08th August, 2025 Comparisons

Ideal vs Worcester Bosch Boile...

When choosing between an Ideal or Worcester Bosch boiler, it can be tricky to know which i...

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What is a Thermocouple?

07th August, 2025 Guides

What is a Thermocouple?

A thermocouple is a critical component in a boiler system. It acts as a safety device, ens...

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Worcester Bosch Boiler No Hot Water

07th August, 2025 Guides

Worcester Bosch Boiler No Hot...

When homeowners encounter a lack of hot water from their Worcester Bosch boiler, it's ofte...

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Are Solar Panels Suited to My Property?

06th August, 2025 Guides

Are Solar Panels Suited to My...

The focus is on specific types of properties that are ideal for solar panels and those tha...

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Do Solar Panels Work in Winter?

31st July, 2025 Guides

Do Solar Panels Work in Winter...

Solar panels can still generate electricity in winter, but their efficiency may be reduced...

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Worcester Boiler Flashing Blue Light No Error Code

25th July, 2025 Guides

Worcester Boiler Flashing Blue...

Boiler error codes serve as essential diagnostics tools that help identify specific issues...

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Why Is My Boiler Whistling?

25th July, 2025 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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Vaillant F62 Fault Code

25th July, 2025 Guides

Vaillant F62 Fault Code

Error codes on boilers can be a confusing and frustrating topic, here at iHeat we want to...

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Ideal F3 Error Code - How To Fix

25th July, 2025 Guides

Ideal F3 Error Code - How To F...

The Ideal F3 error code is a common issue that can cause your boiler to shut down unexpect...

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