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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 Fix a Faulty Heat Exchanger

21st May, 2026 Advice

How to Fix a Faulty Heat Excha...

In this guide, we’re going to be explaining what a heat exchanger is, some common causes f...

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Worcester Bosch Greenstar 4000 Combi

21st May, 2026 Reviews

Worcester Bosch Greenstar 4000...

An in-depth review of the Worcester Bosch Greenstar 4000 Combi boiler, taking a look at it...

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Boiler Service London

21st May, 2026 Guides

Boiler Service London

A typical Annual Boiler Service includes a visual inspection to identify any obvious fault...

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Why is My Boiler Making a Humming Noise?

21st May, 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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Baxi Combi Boiler Costs

21st May, 2026 Guides

Baxi Combi Boiler Costs

A newer, high-end Baxi combi boiler not only aims to save on space but can also offer sign...

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Which Boiler is Best for an Apartment or Flat?

21st May, 2026 Advice

Which Boiler is Best for an Ap...

When your old boiler breaks down and it comes time to replace it with a new one, it may se...

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Boiler Heat Exchanger Replacement Cost

21st May, 2026 Guides

Boiler Heat Exchanger Replacem...

A boiler heat exchanger is a crucial component in heating systems. It allows heat transfer...

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Boiler Installation Edinburgh

21st May, 2026 Guides

Boiler Installation Edinburgh

When installing a new boiler, homeowners must consider the type, the brands available, and...

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Boiler Pilot Light Won't Stay Lit

21st May, 2026 Advice

Boiler Pilot Light Won't Stay...

If you own an older boiler, you might be familiar with the pilot light. The pilot light is...

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Boiler Service Birmingham

21st May, 2026 Guides

Boiler Service Birmingham

Boiler servicing in Birmingham not only ensures a warm environment but also plays a critic...

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Boiler Warranties & Guarantees: Top UK Brands for Best Value

21st May, 2026 Guides

Boiler Warranties & Guarantees...

Boiler warranties and guarantees are essential aspects to consider when investing in a new...

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Combi Boiler Valve Positions Explained

21st May, 2026 Guides

Combi Boiler Valve Positions E...

With the advancements in boiler technology by 2026, understanding the various valve positi...

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