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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

Heat Pumps vs Modern Gas Boilers

03rd November, 2025 Comparisons

Heat Pumps vs Modern Gas Boile...

In times of eye-watering energy prices and home heating bills, some debate which type of h...

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Which Boiler is Best for an Apartment or Flat?

03rd November, 2025 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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Back Boiler Replacement Cost in the UK

27th October, 2025 Guides

Back Boiler Replacement Cost i...

Should you replace that beaten up old back boiler and get with the times?

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Boiler Leaking Water? (How to Fix a Leaking Boiler)

27th October, 2025 Advice

Boiler Leaking Water? (How to...

If your boiler is leaking water, it’s likely due to pressure or worn parts. Acting fast he...

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What Is A MagnaCleanse?

22nd October, 2025 Advice

What Is A MagnaCleanse?

The heating system in your home is a valuable tool that is used on a regular basis, most l...

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Fix a Frozen Boiler Condensate Pipe

22nd October, 2025 Advice

Fix a Frozen Boiler Condensate...

A frozen condensate pipe blocks the waste-water outlet from a modern boiler. This causes t...

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Vaillant F28 Error Code - How to Fix?

16th October, 2025 Guides

Vaillant F28 Error Code - How...

Any time your boiler displays an error code, it can be a huge stressor, especially if it d...

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Boiler Not Working? Most Common Problems (And Fixes)

16th October, 2025 Advice

Boiler Not Working? Most Commo...

A complete guide to getting that boiler working again and some common fault codes and how...

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Understanding Boiler kW (Kilowatts) & How To Measure

16th October, 2025 Guides

Understanding Boiler kW (Kilow...

When it comes to choosing a boiler for your home, understanding the concept of kilowatts (...

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Alternatives to Gas Boilers: What are Your Options?

16th October, 2025 Guides

Alternatives to Gas Boilers: W...

As the UK moves toward a low-carbon future, switching from traditional gas boilers is beco...

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Boiler Safety (Tips for Homeowners)

16th October, 2025 Guides

Boiler Safety (Tips for Homeow...

Critical boiler safety tips that every homeowner should know, ensuring the safe operation...

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Common Viessmann Boiler Error Codes

15th October, 2025 Guides

Common Viessmann Boiler Error...

Read the most common Viessmann boiler error codes and discover how you could fix them.

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