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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

Should You Turn Your Boiler On & Off?

06th November, 2025 Advice

Should You Turn Your Boiler On...

Does turning your boiler on and off actually save you any money? Find out below:

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Why Gas Safety Matters

03rd November, 2025 News

Why Gas Safety Matters

At iHeat, we take gas safety very seriously, ensuring that all our boiler installers are G...

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Ground Source Heat Pump Costs

03rd November, 2025 Guides

Ground Source Heat Pump Costs

Heat pumps are an extremely popular topic of conversation amongst homeowners and heating i...

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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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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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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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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 Prices

10th October, 2025 Guides

Vaillant Boiler Prices

As an online boiler installation company, iHeat provides an in-depth look at Vaillant boil...

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When Should You Replace Your Boiler?

10th October, 2025 Guides

When Should You Replace Your B...

It can cost a lot to get the right boiler installed into your home, which is why a lot of...

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