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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

Does Turning Down Radiators Save Gas & Money?

30th May, 2025 Guides

Does Turning Down Radiators Sa...

While it seems logical that using less heating could save money, the effectiveness of this...

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ESI Thermostat Troubleshooting UK

30th May, 2025 Guides

ESI Thermostat Troubleshooting...

ESI thermostats are designed to help maintain a comfortable temperature in homes and offic...

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How Much Energy/Electricity Do My Appliances Use? Expert advice

30th May, 2025 Guides

How Much Energy/Electricity Do...

Different appliances in your home use various amounts of electricity. Understanding this c...

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Does a Gas Boiler Use Electricity?

30th May, 2025 Guides

Does a Gas Boiler Use Electric...

Gas boilers primarily run on natural gas or liquefied petroleum gas (LPG) to heat homes. N...

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Different Types of Radiators

30th May, 2025 Guides

Different Types of Radiators

Radiators come in various types and materials, offering different benefits. Choosing the r...

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Header Tank Overflowing

30th May, 2025 Guides

Header Tank Overflowing

A header tank, also known as a feed and expansion tank, serves an important role in an ope...

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Ideal Room Temperature

30th May, 2025 Guides

Ideal Room Temperature

Comfort in living spaces is crucial for wellbeing. The ideal room temperature can vary bas...

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What Temperature Should Hot Water Be At The Tap?

30th May, 2025 Guides

What Temperature Should Hot Wa...

Maintaining the ideal hot water temperature in your home or building is essential for safe...

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ATAG Boiler Error Codes - How To Fix

30th May, 2025 Guides

ATAG Boiler Error Codes - How...

When an ATAG boiler displays an error code, the meaning behind each code provides insight...

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Biasi Boiler Error Codes - How To Fix

30th May, 2025 Guides

Biasi Boiler Error Codes - How...

Understanding the error codes on your Biasi boiler is the first step in troubleshooting. S...

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iHeat Awarded Iconic Which? Trusted Trader Accreditation

30th May, 2025 News

iHeat Awarded Iconic Which? Tr...

Receiving the Which? Trusted Trader Accreditation is just the beginning. At iHeat, we unde...

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Electric Space Heaters - Bad Idea?

30th May, 2025 Guides

Electric Space Heaters - Bad I...

Gas heating systems are often more economical for households as natural gas is generally c...

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