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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

Best Boiler Brands in the UK (2025) Top Manufacturers

28th October, 2025 Guides

Best Boiler Brands in the UK (...

Choose the best boiler brand for your home with the iHeat easy guide.

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Best Boilers for Big Families (Large 5 Bedroom House)

28th October, 2025 Guides

Best Boilers for Big Families...

iHeat's guide to the best boilers for big families and larger properties. We explain the d...

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No Power to Boiler

28th October, 2025 Guides

No Power to Boiler

Understanding the various reasons why a boiler may not switch on can save homeowners time...

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

28th October, 2025 Advice

Boiler Losing Pressure, What S...

If your boiler is losing pressure you should identify the cause as soon as possible.

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How To Fix Sludge in Radiators

28th October, 2025 Advice

How To Fix Sludge in Radiators

If you’ve noticed your energy bills rising recently, this could be down to a number of rea...

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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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Alpha E-Tec Combi Boiler Review

27th October, 2025 Reviews

Alpha E-Tec Combi Boiler Revie...

Here we will review the Alpha E-Tec boiler, specifically in its capacity and whether or no...

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What is an Immersion Heater and What Does it Cost?

27th October, 2025 Advice

What is an Immersion Heater an...

Everything UK homeowners need to know about immersion heaters and running costs.

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Megaflow System - What is a Megaflow System and How Much do they Cost?

27th October, 2025 Guides

Megaflow System - What is a Me...

Unveiling the Power of Megaflow: Transforming Your Home's Heating and Hot Water Experience

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How long does it take to fit a new boiler?

27th October, 2025 Guides

How long does it take to fit a...

When having a new boiler installed, one of the main concerns is how long this process will...

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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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How much does a new boiler cost in the UK

22nd October, 2025 Guides

How much does a new boiler cos...

Based on data from over 6,409 boiler installations completed by iHeat in 2025, we’ve analy...

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