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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

Repressurise Vaillant Boiler

30th May, 2025 Guides

Repressurise Vaillant Boiler

Low pressure in a Vaillant boiler is a common issue for many UK households. It affects com...

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Why Is Boiler Water Treatment Important?

30th May, 2025 Guides

Why Is Boiler Water Treatment...

In boiler systems, water treatment involves several techniques. These methods remove impur...

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Can You Pair Radiators With Heat Pumps?

30th May, 2025 Guides

Can You Pair Radiators With He...

Choosing the right radiator for a heat pump is crucial. The performance can vary depending...

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Retrofitting Heat Pumps in Existing Homes: The Pros, Cons, and Key Considerations

30th May, 2025 Guides

Retrofitting Heat Pumps in Exi...

Retrofitting a heat pump replaces or supplements traditional heating methods with modern,...

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Are Heat Pumps Noisy?

30th May, 2025 Guides

Are Heat Pumps Noisy?

Heat pumps have become a popular choice for energy-efficient heating and cooling. A common...

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How To Diagnose Boiler Fan Issues And Fix Them Safely

30th May, 2025 Guides

How To Diagnose Boiler Fan Iss...

A boiler fan is an important part of modern boilers. It ensures proper combustion by pushi...

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How Long Do Heat Pumps Last?

30th May, 2025 Guides

How Long Do Heat Pumps Last?

Heat pumps have an average lifespan of about 15 to 25 years depending on care, usage, and...

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Ground source heat pumps vs air source heat pumps

30th May, 2025 Comparisons

Ground source heat pumps vs ai...

Deciding between air source and ground source heat pumps depends on various factors. Homeo...

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Replace Boiler With Heat Pump - Benefits, Costs & Guide (2025)

30th May, 2025 Guides

Replace Boiler With Heat Pump...

Yes, you can replace a gas boiler with a heat pump in the UK. Many homeowners are explorin...

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Air Source Heat Pump Service

30th May, 2025 Guides

Air Source Heat Pump Service

An air source heat pump should generally be serviced once a year. Regular servicing ensure...

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Ground Source Heat Pump Efficiency

30th May, 2025 Guides

Ground Source Heat Pump Effici...

While GSHPs are beneficial, several factors can affect their performance. Proper installat...

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The Pros & Cons of Air Source Heat Pumps in 2025

30th May, 2025 Guides

The Pros & Cons of Air Source...

Air Source Heat Pumps have become a popular choice for renewable heating in the UK. They e...

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