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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

How to Repressurise a Baxi Boiler

04th February, 2026 Guides

How to Repressurise a Baxi Boi...

Repressurising a Baxi boiler means restoring the correct water pressure inside the boiler...

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How to Prevent Boiler Limescale

04th February, 2026 Guides

How to Prevent Boiler Limescal...

Limescale, primarily composed of calcium carbonate, is a persistent problem in many boiler...

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Boxing In A Boiler: How to Hide a Boiler in Kitchen

04th February, 2026 Guides

Boxing In A Boiler: How to Hid...

Hiding a boiler in the kitchen can enhance the room's aesthetic while maintaining function...

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How to Connect Wireless Thermostat to Boiler

04th February, 2026 Guides

How to Connect Wireless Thermo...

Connecting a wireless thermostat to a boiler can help improve heating efficiency and contr...

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How Much Money Can a New Boiler Save Me?

04th February, 2026 Guides

How Much Money Can a New Boile...

Installing a new boiler can help you save money on your energy bills while improving the e...

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Hive vs Nest - Best Smart Thermostat

04th February, 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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Grundfos Central Heating Pump

04th February, 2026 Guides

Grundfos Central Heating Pump

A Grundfos central heating pump is an essential part of a boiler system in many UK homes....

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F27 Glow Worm Fault

04th February, 2026 Guides

F27 Glow Worm Fault

The F27 error code can result from several underlying issues, ranging from low gas pressur...

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Glow Worm F1 Fault

04th February, 2026 Guides

Glow Worm F1 Fault

Boiler error codes are critical indicators for diagnosing heating system issues. They serv...

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Glow Worm Boiler Review: Ultimate₃ Combi

04th February, 2026 Reviews

Glow Worm Boiler Review: Ultim...

Combi boilers, or combination boilers, epitomise efficiency and convenience in modern home...

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Glow Worm Boiler Pressure

04th February, 2026 Guides

Glow Worm Boiler Pressure

To keep your Glow-Worm boiler working properly, it's essential to maintain the right press...

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Glow Worm Boiler Not Firing Up No Fault Code

04th February, 2026 Guides

Glow Worm Boiler Not Firing Up...

Boiler error codes are a critical feature intended to assist in the diagnosis of issues wi...

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