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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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Boiler Losing Pressure, What Should You Do (How To Fix)

06th November, 2025 Advice

Boiler Losing Pressure, What S...

If your Alpha boiler is showing an error code, use this guide to find out what it means, w...

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Can a Boiler Lose Pressure Without a Leak?

06th November, 2025 Guides

Can a Boiler Lose Pressure Wit...

If your boiler keeps losing pressure but you can’t see a leak, it could be caused by trapp...

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Best Electric Combi Boiler

06th November, 2025 Guides

Best Electric Combi Boiler

Find out which electric combi boilers are the most efficient and reliable in the UK for 20...

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Common Alpha Boiler Error Codes

06th November, 2025 Guides

Common Alpha Boiler Error Code...

If your Alpha boiler is showing an error code, this guide explains what each one means, wh...

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How much does a new boiler cost in the UK

06th November, 2025 Guides

How much does a new boiler cos...

Based on data from over 6,709 boiler installations completed by iHeat in 2025, we’ve analy...

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How long does it take to fit a new boiler?

06th November, 2025 Guides

How long does it take to fit a...

Most boiler installations take between one and two days depending on your current setup an...

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Radiators Not Heating Up: How to Fix?

06th November, 2025 Guides

Radiators Not Heating Up: How...

If your radiators aren’t heating up, it’s usually caused by trapped air, sludge, or a boil...

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Energy Saving With Your Boiler

03rd November, 2025 Advice

Energy Saving With Your Boiler

For most homes in the UK, the cost of heating and hot water can be very pricey. That's why...

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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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Which Boiler Brands Do iHeat Stock?

03rd November, 2025 Advice

Which Boiler Brands Do iHeat S...

At iHeat we want our customers to receive only the best boilers available, that’s why we s...

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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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