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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

Why is My Radiator So Noisy?

04th February, 2026 Guides

Why is My Radiator So Noisy?

Radiators can emit a variety of sounds, each indicating a different potential issue within...

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F54 Vaillant Boiler Fault Code

04th February, 2026 Guides

F54 Vaillant Boiler Fault Code

Boiler error codes are numeric or alphanumeric messages displayed on the boiler's interfac...

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Electric Boiler vs Gas Boiler

04th February, 2026 Comparisons

Electric Boiler vs Gas Boiler

In this article we will discuss the topic of different boiler types, specifically electric...

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E1 Error Code - How To Fix

04th February, 2026 Guides

E1 Error Code - How To Fix

When a boiler starts displaying an error code out of the blue it can be a shock to the sys...

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Condensing Boilers vs Combi Boilers

04th February, 2026 Comparisons

Condensing Boilers vs Combi Bo...

In this guide, we’re going to be explaining what each of these terms mean so you know exac...

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Central Heating Inhibitor

04th February, 2026 Advice

Central Heating Inhibitor

A central heating inhibitor can be a vital part of heating systems that many people forget...

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Boiler Short Cycling - Fixes

04th February, 2026 Guides

Boiler Short Cycling - Fixes

Our Boiler Short Cycling Fixes blog offers expert solutions and practical advice to addres...

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Boiler Repair Near Me

04th February, 2026 Guides

Boiler Repair Near Me

Boiler repair involves addressing issues with a boiler system, ensuring it functions safel...

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Boiler Repair London

04th February, 2026 Guides

Boiler Repair London

Boiler repair in London for the year 2026 entails not only a financial consideration but a...

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Boiler Repair Birmingham

04th February, 2026 Guides

Boiler Repair Birmingham

Boiler repairs are a critical aspect of maintaining a household's functionality and safety...

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Boiler Installation Bolton

04th February, 2026 Guides

Boiler Installation Bolton

The expense incurred from installing a boiler can vary significantly based on factors such...

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Boiler Hacks: Boost Performance & Savings

04th February, 2026 Guides

Boiler Hacks: Boost Performanc...

Boiler hacks are simple tricks and tips that can help you save money on your heating bills...

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