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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

UPDATED: Heat Pump Planning Permission: Do I Need It for My Home?

05th January, 2026 Guides

UPDATED: Heat Pump Planning Pe...

Heat pumps generally don't require planning permission in the UK, thanks to permitted deve...

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Ground source heat pumps vs air source heat pumps

05th January, 2026 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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Ground Source Heat Pump Efficiency

05th January, 2026 Guides

Ground Source Heat Pump Effici...

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

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Ground Source Heat Pump Servicing Cost

05th January, 2026 Guides

Ground Source Heat Pump Servic...

Regular servicing of a ground source heat pump is essential to ensure its efficiency and l...

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Hive vs Nest - Best Smart Thermostat

05th January, 2026 Reviews

Hive vs Nest - Best Smart Ther...

When choosing a smart thermostat, the Nest and Hive are top contenders. Each offers key fe...

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Best Portable Air Conditioner UK

05th January, 2026 Guides

Best Portable Air Conditioner...

Portable air conditioners are movable units designed to cool specific areas. They are espe...

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New Gas Boiler Technology & Features

05th January, 2026 Guides

New Gas Boiler Technology & Fe...

Modern gas boilers can offer significant advantages over older, less efficient models, fro...

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Oil Boiler Ban

05th January, 2026 Guides

Oil Boiler Ban

As preparation steps up for the transition from oil boilers, homeowners confront a multifa...

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Combi Boilers vs Conventional Boilers

05th January, 2026 Guides

Combi Boilers vs Conventional...

Combi boilers, also known as combination boilers, are compact units that serve as both a c...

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Heat Pumps: The Ultimate UK guide

05th January, 2026 Guides

Heat Pumps: The Ultimate UK gu...

As energy efficiency and environmental concerns continue to shape our choices, heat pumps...

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Busting Common Boiler Myths

05th January, 2026 Advice

Busting Common Boiler Myths

We understand that not everyone is a boiler expert, and despite the at times confusing app...

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Combi Boilers - Advantages And Disadvantages

05th January, 2026 Comparisons

Combi Boilers - Advantages And...

Combi boilers are by far the most popular type of home heating system in the UK, and with...

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