Stephen Day profile photo

Stephen Day

Gas Safe Engineer

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.

LinkedIn

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.

Expertise & Focus Areas

  • 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 Boilers for Big Families (Large 5 Bedroom House)

24th September, 2025 Guides

Best Boilers for Big Families...

iHeat's guide to the best boilers for big families and larger properties. We explain the d...

read article arrow Read Article
Baxi Boiler E125 Error Code

22nd September, 2025 Guides

Baxi Boiler E125 Error Code

Boiler systems are intricate and can exhibit a range of error codes that signal specific i...

read article arrow Read Article
Are System Boilers Still Used in 2025?

22nd September, 2025 Guides

Are System Boilers Still Used...

System boilers have significantly evolved, featuring cutting-edge technology that enhances...

read article arrow Read Article
Are Heat Pumps More Efficient than Gas Boilers?

22nd September, 2025 Comparisons

Are Heat Pumps More Efficient...

This blog comprehensively compares heat pumps and gas boilers, focusing on their efficienc...

read article arrow Read Article
Alpha E-Tec Hybrid Heat Pump

22nd September, 2025 Advice

Alpha E-Tec Hybrid Heat Pump

You may have heard of a heat pump, you probably have heard of a boiler, you probably have...

read article arrow Read Article
Power Flush vs Chemical Flush

22nd September, 2025 Comparisons

Power Flush vs Chemical Flush

Both a power flush and chemical flush are forms of system cleaning you can use for your ce...

read article arrow Read Article
Viessmann 222-F Boiler Review

19th September, 2025 Reviews

Viessmann 222-F Boiler Review

Viessmann is an international brand with over a century of trusted design and application,...

read article arrow Read Article
Glow Worm Boiler Reviews

16th September, 2025 Reviews

Glow Worm Boiler Reviews

In 2025, Glow Worm continues to offer a broad range of boilers, each tailored to different...

read article arrow Read Article
Best Condensing Boilers 2025

16th September, 2025 Guides

Best Condensing Boilers 2025

Condensing boilers are considered to be some of the most efficient boilers out there on th...

read article arrow Read Article
iHeat Support Gas Safety Week 2025

11th September, 2025 Guides

iHeat Support Gas Safety Week...

Gas Safety Week 2025 is an important annual event that raises awareness of the dangers of...

read article arrow Read Article
Viessmann Vitodens 100-W Combi Boiler Review

04th September, 2025 Reviews

Viessmann Vitodens 100-W Combi...

This beast of a combi boiler is one of the most sought-after models from Viessmann

read article arrow Read Article
Worcester Bosch Greenstar 2000 Boiler Review

04th September, 2025 Reviews

Worcester Bosch Greenstar 2000...

Worcester Bosch has a new range of condensing combi boilers, including the Worcester Bosch...

read article arrow Read Article