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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

Combi Boiler Replacement Cost

10th October, 2025 Guides

Combi Boiler Replacement Cost

Replacing your boiler can be a stressful and costly process. That’s why we have written th...

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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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Old Boiler - Replace Before Selling My House?

10th October, 2025 Guides

Old Boiler - Replace Before Se...

A well-maintained, efficient boiler is not only more attractive but can also suggest that...

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Do I Need to Do Anything Prior to My Boiler Installation?

10th October, 2025 Guides

Do I Need to Do Anything Prior...

Installing a new boiler is an important investment in your home, and there are several thi...

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Should You Buy A New Gas Boiler?

10th October, 2025 Advice

Should You Buy A New Gas Boile...

Are the different types of boilers confusing you? Let us explain exactly what gas boiler i...

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New Central Heating System Costs - (Need To Upgrade?)

10th October, 2025 Guides

New Central Heating System Cos...

By upgrading your old, inefficient heating system you can improve your home’s temperature...

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UK Energy Price Cap Estimate Exceeds £4000

10th October, 2025 News

UK Energy Price Cap Estimate E...

With the current energy crisis in Europe, many UK residents are finding their monthly heat...

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Is it Cheaper to Replace Your Boiler in Summer?

10th October, 2025 Guides

Is it Cheaper to Replace Your...

You may be wondering when the best time to replace your old, inefficient boiler is, and wh...

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Ideal Combi Boiler Costs

10th October, 2025 Guides

Ideal Combi Boiler Costs

Ideal's combi boilers are engineered to meet these needs, offering a range of models that...

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How Old is My Boiler and When to Consider a Replacement?

10th October, 2025 Guides

How Old is My Boiler and When...

A modern, efficient boiler can operate at over 90% efficiency, leading to significant savi...

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How Often Should a Boiler Be Replaced?

09th October, 2025 Guides

How Often Should a Boiler Be R...

It's critical for homeowners to understand the lifespan of their boiler to maintain an eff...

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How much cheaper is a new boiler to run?

09th October, 2025 Guides

How much cheaper is a new boil...

New boilers are in fact much cheaper to run than old boilers, this is down to a number of...

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