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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

Best Condensing Boilers 2026

26th February, 2026 Guides

Best Condensing Boilers 2026

Condensing boilers are considered to be some of the most efficient boilers out there on th...

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Vaillant Boiler Parts 2026

26th February, 2026 Guides

Vaillant Boiler Parts 2026

Vaillant boilers use a variety of parts to ensure efficient operation. This section looks...

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Most Economical Way to Use Central Heating UK

26th February, 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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Combi Boiler Pipes Explained

26th February, 2026 Guides

Combi Boiler Pipes Explained

Understanding the key components of combi boiler pipework is essential for making informed...

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Boiler Installation Birmingham

26th February, 2026 Guides

Boiler Installation Birmingham

When contemplating a new boiler installation in Birmingham during 2026, homeowners should...

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Boiler Installation Liverpool

26th February, 2026 Guides

Boiler Installation Liverpool

Types of Boilers There are three primary boiler types to consider for a home in Liverpool:...

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Fitting A New Boiler to an Old System - Mega Guide

26th February, 2026 Guides

Fitting A New Boiler to an Old...

Replacing an old boiler with a new one involves several key steps that ensure safe and eff...

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Boiler Installation London

19th February, 2026 Guides

Boiler Installation London

Selecting the appropriate boiler for your London home involves understanding the different...

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Boiler Service London

19th February, 2026 Guides

Boiler Service London

A typical Annual Boiler Service includes a visual inspection to identify any obvious fault...

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Boiler Service Bolton

19th February, 2026 Guides

Boiler Service Bolton

Boiler servicing comprises a set of inspections and tests conducted by a qualified enginee...

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Boiler Installation Glasgow

19th February, 2026 Guides

Boiler Installation Glasgow

Boiler installation is a critical process entailing the careful selection and fitting of a...

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Boiler Service Glasgow

19th February, 2026 Guides

Boiler Service Glasgow

Boiler servicing is a comprehensive check involving numerous standard procedures to ensure...

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