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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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 increase boiler efficiency

16th October, 2025 Guides

How to increase boiler efficie...

Want to maximise your boiler efficiency in cold weather? Our guide provides tips on how to...

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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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Baxi Boiler E133 Error Code

15th October, 2025 Guides

Baxi Boiler E133 Error Code

Understanding boiler error codes is essential in determining the proper course of action....

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Worcester Bosch A21 Error Code - How To Fix

15th October, 2025 Guides

Worcester Bosch A21 Error Code...

If Your Worcester Bosch boiler is displaying an A21 error code it can be a vexing issue, e...

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Common Worcester Bosch Boiler Error Codes

15th October, 2025 Guides

Common Worcester Bosch Boiler...

In this guide, we are going to highlight the most common Worcester BOSCH errors that can s...

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Worcester Boiler Fault 227

14th October, 2025 Guides

Worcester Boiler Fault 227

Boiler systems utilise error codes as an internal diagnostic tool. They offer a swift indi...

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How to Drain a Combi Boiler

14th October, 2025 Advice

How to Drain a Combi Boiler

There are a few reasons why you might want to drain your combi boiler. For example, perhap...

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Vaillant Boiler Not Working, No Fault Code

14th October, 2025 Guides

Vaillant Boiler Not Working, N...

Boiler error codes provide essential diagnostics for homeowners and engineers alike, signa...

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Common Alpha Boiler Error Codes

14th October, 2025 Guides

Common Alpha Boiler Error Code...

Some of the most common Alpha boiler error codes and what they mean

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Worcester Bosch Boiler Pressure - UK Mega Guide

14th October, 2025 Guides

Worcester Bosch Boiler Pressur...

Maintaining the correct boiler pressure is essential for the efficiency and longevity of W...

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Ideal Boiler L2 Fault Code - How to Fix

14th October, 2025 Guides

Ideal Boiler L2 Fault Code - H...

Facing an Ideal L2 boiler error code? iHeat, an online boiler installation company, explai...

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