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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 Soundproof a Boiler Cupboard

04th February, 2026 Guides

How to Soundproof a Boiler Cup...

From adding insulation to sealing gaps, there are both DIY and professional methods availa...

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Worcester Boiler Fault 227

04th February, 2026 Guides

Worcester Boiler Fault 227

Boiler systems utilise error codes as an internal diagnostic tool. They offer a swift indi...

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The Best LPG Combi Boilers 2026

04th February, 2026 Guides

The Best LPG Combi Boilers 202...

You may have heard of LPG boilers before, but even if you are not familiar with them, they...

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What is Boiler Dry Cycling?

03rd February, 2026 Guides

What is Boiler Dry Cycling?

Boiler dry cycling occurs when a boiler frequently turns on and off without a demand for h...

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How Long Does a Boiler Service Take?

03rd February, 2026 Advice

How Long Does a Boiler Service...

A boiler service is an important part of boiler maintenance, helping to ensure that your h...

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Vaillant F61 Error Code - How To Fix

03rd February, 2026 Guides

Vaillant F61 Error Code - How...

One of the most common Vaillant boiler error codes is the F61 error code. This error code...

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F29 Vaillant Fault Code

03rd February, 2026 Guides

F29 Vaillant Fault Code

The F29 Vaillant fault code is a frustrating problem that can cause your boiler to shut do...

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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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