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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

Combi Boiler Replacement Cost

20th May, 2026 Guides

Combi Boiler Replacement Cost

Replacing your boiler can be a stressful and costly process. That’s why we have written th...

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Old Boiler - Replace Before Selling My House?

20th May, 2026 Guides

Old Boiler - Replace Before Se...

A well-maintained, efficient boiler is not only more attractive but can also suggest that...

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Reducing heat loss from your home

20th May, 2026 Guides

Reducing heat loss from your h...

Heat loss in a home happens when warm air escapes to the outside, and cold air infiltrates...

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Ravenheat Boiler - Combi Prices 2026

20th May, 2026 Guides

Ravenheat Boiler - Combi Price...

Ravenheat combi boilers are known for their affordability and efficiency. They include mod...

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Why Is My Radiator Not Working?

20th May, 2026 Advice

Why Is My Radiator Not Working...

When you have a radiator not working, there is not always an immediately obvious way to fi...

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Different Types Of Radiator Bleed Valves/Knobs Explained

20th May, 2026 Guides

Different Types Of Radiator Bl...

Radiator dials, often referred to as bleed valves or knobs, are crucial for managing the p...

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Plumber and Heating Engineer - What's the Difference?

20th May, 2026 Guides

Plumber and Heating Engineer -...

When deciding whether to call a plumber or a heating engineer, it’s important to know what...

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OpenTherm

20th May, 2026 Guides

OpenTherm

OpenTherm began with the objective of streamlining communications between heating system c...

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Open Vented Boilers: What are they and do you need one?

20th May, 2026 Guides

Open Vented Boilers: What are...

In this guide, we are going to talk about what an open vent heating system is, how it work...

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No Hot Water From Boiler?

20th May, 2026 Advice

No Hot Water From Boiler?

Some of the most common reasons for not getting any hot water from your boiler.

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Should You Buy A New Gas Boiler?

20th May, 2026 Advice

Should You Buy A New Gas Boile...

Are the different types of boilers confusing you? Let us explain exactly what gas boiler i...

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New Gas Boiler Technology & Features

20th May, 2026 Guides

New Gas Boiler Technology & Fe...

Modern gas boilers can offer significant advantages over older, less efficient models, fro...

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