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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 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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Unusual Boiler Smells: Causes and Fixes

04th February, 2026 Guides

Unusual Boiler Smells: Causes...

Unusual boiler smells can be a sign of a serious problem, such as a gas leak or bacterial...

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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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Shower Going Hot and Cold - Combi Boiler

04th February, 2026 Guides

Shower Going Hot and Cold - Co...

Within homes across the UK, the combination boiler, commonly known as a combi boiler, serv...

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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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Pressure Dropping on Boiler Every Day

04th February, 2026 Guides

Pressure Dropping on Boiler Ev...

Boiler pressure is the measure of balance between water and air within the central heating...

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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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No Hot Water From Boiler?

04th February, 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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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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Megaflow System - What is a Megaflow System and How Much do they Cost?

04th February, 2026 Guides

Megaflow System - What is a Me...

Unveiling the Power of Megaflow: Transforming Your Home's Heating and Hot Water Experience

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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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How to Increase Pressure on Worcester Bosch Boiler Without Key

04th February, 2026 Guides

How to Increase Pressure on Wo...

A Worcester Bosch boiler is a complex machine with many components working together to hea...

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