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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

Best Regular (Heat-Only) Boilers in 2026

14th January, 2026 Guides

Best Regular (Heat-Only) Boile...

Here at iHeat we’re experts in anything boilers, and understand at times the central heati...

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Best System Boilers for 2026

14th January, 2026 Guides

Best System Boilers for 2026

A quick shortlist of the best system boilers in the UK for reliable heating and strong hot...

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Best Electric Boilers 2026

12th January, 2026 Guides

Best Electric Boilers 2026

The best electric boilers in 2026 include models from Electric Heating Company, Heatrae Sa...

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Best Boilers for Big Families (Large 5 Bedroom House)

12th January, 2026 Guides

Best Boilers for Big Families...

For most large UK homes and big families, a system boiler with a correctly sized hot water...

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Best Compact Combi Boilers For Small Homes

09th January, 2026 Guides

Best Compact Combi Boilers For...

A simple guide to the smallest combi boilers that fit inside kitchen cupboards and tight s...

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Best Boiler Brands in the UK (2026) Top Manufacturers

09th January, 2026 Guides

Best Boiler Brands in the UK (...

The best boiler brands for UK homes in 2026 are Worcester Bosch, Vaillant, Viessmann, Alph...

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Best Combi Boiler 2026

08th January, 2026 Guides

Best Combi Boiler 2026

Here’s a quick roundup of the best combi boilers for 2026.

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How to Link a Wood Burner to Your Central Heating (UK Guide)

06th January, 2026 Guides

How to Link a Wood Burner to Y...

Connecting a wood burner to your central heating system can be an efficient way to heat yo...

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AI Technology in Home Heating: The Future of Efficiency?

06th January, 2026 Guides

AI Technology in Home Heating:...

Artificial Intelligence (AI) is changing home heating by introducing smarter, more efficie...

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Boiler Repair Birmingham

05th January, 2026 Guides

Boiler Repair Birmingham

Boiler repairs are a critical aspect of maintaining a household's functionality and safety...

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Boiler Repair Liverpool

05th January, 2026 Guides

Boiler Repair Liverpool

In Liverpool, the efficiency and safety of boiler systems are paramount for comfortable li...

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Boiler Service Liverpool

05th January, 2026 Guides

Boiler Service Liverpool

The price of a boiler service is influenced by various factors including the type of boile...

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