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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

Boiler Warranty Invalid? Warranty Checklist

03rd February, 2026 Guides

Boiler Warranty Invalid? Warra...

This article explains what a boiler warranty covers, what actions can invalidate it, and h...

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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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Baxi Boiler E125 Error Code

03rd February, 2026 Guides

Baxi Boiler E125 Error Code

Boiler systems are intricate and can exhibit a range of error codes that signal specific i...

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Worcester Boiler Fault 227

03rd 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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Plumber and Heating Engineer - What's the Difference?

03rd February, 2026 Guides

Plumber and Heating Engineer -...

When deciding whether to call a plumber or a heating engineer, it’s important to know what...

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Why Is Boiler Water Treatment Important?

03rd February, 2026 Guides

Why Is Boiler Water Treatment...

In boiler systems, water treatment involves several techniques. These methods remove impur...

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Boiler Installation Birmingham

03rd February, 2026 Guides

Boiler Installation Birmingham

When contemplating a new boiler installation in Birmingham during 2026, homeowners should...

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How Efficient Is My Boiler?

03rd February, 2026 Guides

How Efficient Is My Boiler?

Boiler energy efficiency refers to how well a boiler uses its fuel to generate heat. This...

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What Type of Boiler Is Right for Me?

03rd February, 2026 Guides

What Type of Boiler Is Right f...

Our guide explores the different types of boilers available, including combi, system, and...

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Repressurise Vaillant Boiler

03rd February, 2026 Guides

Repressurise Vaillant Boiler

Low pressure in a Vaillant boiler is a common issue for many UK households. It affects com...

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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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Why is My Boiler Making a Humming Noise?

03rd February, 2026 Guides

Why is My Boiler Making a Humm...

Boiler noises are frequent issues that signal varied problems within the system. From slig...

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