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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

Can I Have Air Conditioning and a Gas Boiler?

06th February, 2026 Guides

Can I Have Air Conditioning an...

Achieve year-round comfort in your boiler-heated home by integrating efficient air conditi...

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How to Link a Wood Burner to Your Central Heating (UK Guide)

06th February, 2026 Guides

How to Link a Wood Burner to Y...

Connecting a wood burner to your central heating system can be an efficient way to heat yo...

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When Does a New Boiler Need Its First Service?

06th February, 2026 Advice

When Does a New Boiler Need It...

Having your boiler serviced regularly is important for ensuring its safety and efficiency,...

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Vaillant Combi Boiler Costs

06th February, 2026 Guides

Vaillant Combi Boiler Costs

As Vaillant continues to innovate, integrating smart technology and improving energy perfo...

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What is a Heat Exchanger?

06th February, 2026 Guides

What is a Heat Exchanger?

Heat exchangers are pivotal devices within a boiler system, playing a crucial role in tran...

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Flashing Radiator Symbol on Boiler

05th February, 2026 Guides

Flashing Radiator Symbol on Bo...

Recognising a flashing radiator symbol on a boiler's display is pivotal for maintaining ef...

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Worcester Bosch Boiler Control Panel

05th February, 2026 Guides

Worcester Bosch Boiler Control...

Digital Controls are intuitive interfaces that allow homeowners to manage their heating sc...

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Most Efficient Combi Boiler to Save Money

05th February, 2026 Guides

Most Efficient Combi Boiler to...

Combi boilers are celebrated for their energy efficiency and compact size, a departure fro...

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Boiler Service Cost (What To Expect)

05th February, 2026 Guides

Boiler Service Cost (What To E...

A boiler service is a thorough inspection of a boiler system by a qualified engineer.

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Y Plan Wiring Diagram

05th February, 2026 Guides

Y Plan Wiring Diagram

A Y Plan heating system is a design used in some homes to manage both central heating and...

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Combi Boiler Valve Positions Explained

05th February, 2026 Guides

Combi Boiler Valve Positions E...

With the advancements in boiler technology by 2026, understanding the various valve positi...

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What temperature should my boiler be set at for central heating?

05th February, 2026 Guides

What temperature should my boi...

Boilers are the heartbeat of a home's central heating system, efficiently managing the bal...

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