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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

Do You Need New Radiators for Heat Pumps?

05th December, 2025 Advice

Do You Need New Radiators for...

Most homes need some radiators upgraded for a heat pump, but usually not all of them.

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Leaking Radiator Valve (Lockshield)

28th November, 2025 Guides

Leaking Radiator Valve (Locksh...

A leaking lockshield valve is usually caused by a loose gland nut, worn seal or corrosion,...

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High Temperature Heat Pumps UK - Are They Worth It?

28th November, 2025 Advice

High Temperature Heat Pumps UK...

High temperature heat pumps work like boilers without needing radiators, but they cost mor...

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Why is My Boiler Not Working?

27th November, 2025 Guides

Why is My Boiler Not Working?

Maintaining a boiler in good working order is essential for its efficiency and longevity....

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No Power to Boiler

27th November, 2025 Guides

No Power to Boiler

Find out why your boiler has no power and the key checks you can safely do before calling...

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Common Alpha Boiler Error Codes

12th 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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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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