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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

Hot Water Storage Cylinders/Tanks for Boilers

20th May, 2026 Guides

Hot Water Storage Cylinders/Ta...

Choosing the right hot water tank requires understanding your home’s specific requirements...

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Home Boiler Cover - Mega Guide

20th May, 2026 Guides

Home Boiler Cover - Mega Guide

Home boiler cover acts as a safety net, ensuring that if a boiler breaks down or encounter...

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Heat Pumps vs Modern Gas Boilers

20th May, 2026 Comparisons

Heat Pumps vs Modern Gas Boile...

In times of eye-watering energy prices and home heating bills, some debate which type of h...

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Heat Pumps: The Ultimate UK guide

20th May, 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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Heat Pump Pros and Cons - A Complete Guide for UK 2026

20th May, 2026 Comparisons

Heat Pump Pros and Cons - A Co...

As one of the hottest topics in the industry, heat pumps are being contemplated by homeown...

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Google Nest Thermostat Benefits

20th May, 2026 Reviews

Google Nest Thermostat Benefit...

A Google Nest smart thermostat can be a powerful tool in controlling home heating and thro...

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F27 Glow Worm Fault

20th May, 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 F29 Error Code - How To Fix

20th May, 2026 Guides

Glow-Worm F29 Error Code - How...

The Glow-Worm F29 error code indicates a loss of flame during operation, which can cause a...

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Glow Worm F1 Fault

20th May, 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 Combi Boiler Costs

20th May, 2026 Guides

Glow Worm Combi Boiler Costs

A combi boiler, or combination boiler, is a high-efficiency water heater and a central hea...

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Glow Worm Boiler Review: Ultimate₃ Combi

20th May, 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 Not Firing Up No Fault Code

20th May, 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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