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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

How To Choose The Right Boiler For Your Home

03rd February, 2026 Guides

How To Choose The Right Boiler...

Choosing the right boiler for your home can be a stressful and overwhelming experience, bu...

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Do I Need to Do Anything Prior to My Boiler Installation?

03rd February, 2026 Guides

Do I Need to Do Anything Prior...

Installing a new boiler is an important investment in your home, and there are several thi...

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Can a Boiler Explode?

03rd February, 2026 Guides

Can a Boiler Explode?

Boilers are a key part of many homes, but they can pose risks if not properly maintained....

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Old Boiler - Replace Before Selling My House?

03rd February, 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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Ariston Boiler Error Codes

03rd February, 2026 Guides

Ariston Boiler Error Codes

Common issues include low water pressure or failure to ignite, indicated by specific error...

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Egg Timer on Vaillant Boiler

03rd February, 2026 Guides

Egg Timer on Vaillant Boiler

The egg timer symbol on a Vaillant boiler signifies the activation of the anti-cycling fun...

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How to Reset Ideal Logic Combi 30 Boiler

03rd February, 2026 Guides

How to Reset Ideal Logic Combi...

Resetting an Ideal Logic Combi 30 boiler might be needed for a few reasons. Often, it is d...

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Vaillant Comfort Mode (and Flashing C on a Vaillant Boiler)

03rd February, 2026 Guides

Vaillant Comfort Mode (and Fla...

Vaillant Comfort Mode is a feature available on Vaillant boilers designed to provide a con...

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What Temperature For A Thermostat In Winter?

03rd February, 2026 Guides

What Temperature For A Thermos...

Thermostats are devices used to control the heating or cooling of a home. They function by...

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Boiler in Bathroom

03rd February, 2026 Guides

Boiler in Bathroom

Installing a boiler in a bathroom can be safe and legal in the UK, but specific regulation...

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What is Boiler Commissioning?

03rd February, 2026 Guides

What is Boiler Commissioning?

Boiler commissioning is an essential part of installing a new boiler system. It involves a...

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Who Qualifies for a Boiler Grant in 2026?

03rd February, 2026 Guides

Who Qualifies for a Boiler Gra...

Boiler grants in the UK assist homeowners in upgrading heating systems to more efficient m...

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