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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

What Temperature Should My Boiler Be Set At In Winter?

02nd December, 2025 Guides

What Temperature Should My Boi...

Most homes stay warm in winter with heating set at 60 to 70°C and hot water at 50 to 55°C.

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Central Heating System

02nd December, 2025 Guides

Central Heating System

A simple breakdown of the main central heating systems in UK homes and how to decide which...

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Do You Need New Radiators for Heat Pumps?

02nd 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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How much does a new boiler cost in the UK

02nd December, 2025 Guides

How much does a new boiler cos...

Based on data from over 7000 boiler installations completed by iHeat in 2025, we’ve analys...

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Hive App Not Working? Here's Why And How to Fix

28th November, 2025 Guides

Hive App Not Working? Here's W...

Most Hive heating issues come from lost connection, low batteries, receiver faults or boil...

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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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Worcester Bosch vs Vaillant Boilers - Which is Better?

28th November, 2025 Advice

Worcester Bosch vs Vaillant Bo...

A clear comparison of Worcester Bosch and Vaillant Boilers and why Worcester Bosch is ofte...

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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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Best Boiler Brands in the UK (2025) Top Manufacturers

27th November, 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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Ideal vs Worcester Bosch Boilers

27th November, 2025 Comparisons

Ideal vs Worcester Bosch Boile...

When choosing between an Ideal or Worcester Bosch boiler, it can be tricky to know which i...

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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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