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

F27 Glow Worm Fault

30th May, 2025 Guides

F27 Glow Worm Fault

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

read article arrow Read Article
Vaillant F61 Error Code - How To Fix

30th May, 2025 Guides

Vaillant F61 Error Code - How...

One of the most common Vaillant boiler error codes is the F61 error code. This error code...

read article arrow Read Article
Boiler Short Cycling - Fixes

30th May, 2025 Guides

Boiler Short Cycling - Fixes

Our Boiler Short Cycling Fixes blog offers expert solutions and practical advice to addres...

read article arrow Read Article
What is a Boiler PCB?

30th May, 2025 Guides

What is a Boiler PCB?

Our helpful PCB blog provides a comprehensive explanation of the Printed Circuit Board (PC...

read article arrow Read Article
Unusual Boiler Smells: Causes and Fixes

30th May, 2025 Guides

Unusual Boiler Smells: Causes...

Unusual boiler smells can be a sign of a serious problem, such as a gas leak or bacterial...

read article arrow Read Article
What is a Smart Home and Smart Boiler?

30th May, 2025 Guides

What is a Smart Home and Smart...

Smart boilers are an innovative technology that can help homeowners save money on their en...

read article arrow Read Article
Boiler and Shower Issue Fixes

30th May, 2025 Guides

Boiler and Shower Issue Fixes

If you're experiencing issues with your boiler and shower, such as no hot water or low wat...

read article arrow Read Article
Vaillant F73 Error Code - How To Fix

30th May, 2025 Guides

Vaillant F73 Error Code - How...

The Vaillant F73 error code indicates a problem with the water pressure sensor, which can...

read article arrow Read Article
What is a Storage Combi Boiler?

30th May, 2025 Guides

What is a Storage Combi Boiler...

Storage combi boilers are a popular choice for homeowners who want the benefits of a combi...

read article arrow Read Article
Glow-Worm F29 Error Code - How To Fix

30th May, 2025 Guides

Glow-Worm F29 Error Code - How...

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

read article arrow Read Article
Tips to Look After Your Heat Pump in Winter

30th May, 2025 Guides

Tips to Look After Your Heat P...

Heat pumps are an efficient and eco-friendly way to heat your home, but they can face chal...

read article arrow Read Article
Why Putting a Boiler Outside Is Often a Bad Idea

30th May, 2025 Guides

Why Putting a Boiler Outside I...

While putting a boiler outside may seem like a good idea to save space and reduce noise in...

read article arrow Read Article