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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

Boiler Flue Regulations

05th February, 2026 Guides

Boiler Flue Regulations

A boiler flue is a critical component that helps expel harmful gases from your home, ensur...

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Vaillant Boiler Red Light

05th February, 2026 Guides

Vaillant Boiler Red Light

Understanding what the red light and associated fault codes mean is vital for boiler owner...

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Vaillant Ecotec Pro Review

05th February, 2026 Reviews

Vaillant Ecotec Pro Review

Vaillant's Ecotec Pro combi boiler series is renowned for providing efficient heating and...

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Baxi 830 Combi Boiler Review

05th February, 2026 Guides

Baxi 830 Combi Boiler Review

The Baxi 830 combi boiler is a compact and efficient heating system that offers excellent...

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Ideal Combi Boiler Costs

05th February, 2026 Guides

Ideal Combi Boiler Costs

Ideal's combi boilers are engineered to meet these needs, offering a range of models that...

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Glow Worm Boiler Reviews

05th February, 2026 Reviews

Glow Worm Boiler Reviews

In 2026, Glow Worm continues to offer a broad range of boilers, each tailored to different...

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How to Set Digital Timer on Boiler

05th February, 2026 Guides

How to Set Digital Timer on Bo...

A digital timer on a boiler is a control device that allows users to set specific times fo...

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How to Improve Radiator Efficiency & Performance

05th February, 2026 Guides

How to Improve Radiator Effici...

Radiator efficiency plays a key role in maintaining a comfortable and cost-effective home....

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Boiler Overheating

05th February, 2026 Guides

Boiler Overheating

When a boiler overheats, it can cause significant issues. Components inside can get damage...

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How to Flush Central Heating System

05th February, 2026 Guides

How to Flush Central Heating S...

Flushing a central heating system means cleaning out the inside of the pipes, radiators, a...

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Repressurise Vaillant Boiler

05th February, 2026 Guides

Repressurise Vaillant Boiler

Low pressure in a Vaillant boiler is a common issue for many UK households. It affects com...

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Ignition Lockout on Boiler

05th February, 2026 Guides

Ignition Lockout on Boiler

A boiler lockout occurs when a boiler detects a fault and shuts down to prevent further is...

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