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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

Vaillant F23 Fault Code

05th February, 2026 Guides

Vaillant F23 Fault Code

When a boiler encounters a fault or malfunction, it communicates the problem through speci...

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Vaillant Boilers Reviews

04th February, 2026 Reviews

Vaillant Boilers Reviews

Vaillant offers an extensive selection of boilers to cater to different household requirem...

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Vaillant Boiler Error Codes

04th February, 2026 Guides

Vaillant Boiler Error Codes

Read all about the most common Vaillant boiler error codes, what they mean and how you can...

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Solar Panel Costs and Boiler Compatibility

04th February, 2026 Guides

Solar Panel Costs and Boiler C...

As the world continues to grapple with environmental challenges, the adoption of renewable...

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Ravenheat Boiler Error Codes

04th February, 2026 Guides

Ravenheat Boiler Error Codes

Error codes can range from ignition troubles to pressure fluctuations, each denoting a spe...

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Potterton Boiler Flashing Green

04th February, 2026 Guides

Potterton Boiler Flashing Gree...

A Potterton boiler displaying a flashing green light can indicate various issues. When no...

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Why Won't My Boiler Turn On?

04th February, 2026 Guides

Why Won't My Boiler Turn On?

Boilers are complex systems, and pinpointing the exact reason for failure can sometimes be...

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How You Can Lower Your Heating Bill

04th February, 2026 Advice

How You Can Lower Your Heating...

The COVID-19 pandemic may have left you wondering how you can save money. We run through h...

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Ideal F7 Error Code - How To Fix

04th February, 2026 Guides

Ideal F7 Error Code - How To F...

Understanding the Ideal F7 error code is vital for diagnosing the issue and applying the a...

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Ideal L-F Error Code - How To Fix

04th February, 2026 Guides

Ideal L-F Error Code - How To...

When an Ideal boiler displays the L-F fault code, it is indicative of a flame loss issue....

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Ideal Boilers Reviews

04th February, 2026 Reviews

Ideal Boilers Reviews

Ideal Boilers, with over a century of operation, has solidified its position as a venerabl...

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Ideal Boiler FU Fault Code: How to Fix

04th February, 2026 Guides

Ideal Boiler FU Fault Code: Ho...

The Ideal Boiler FU fault code indicates a significant difference in temperature between t...

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