Stephen Day profile photo

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.

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.

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

What is Boiler Pump Overrun? - Functions, Issues, and Fixes

29th May, 2026 Guides

What is Boiler Pump Overrun? -...

Pump overrun in boilers is a feature that helps cool down the system and manage residual h...

read article arrow Read Article
What is a Tundish?

29th May, 2026 Guides

What is a Tundish?

A tundish is a small yet essential component found in heating systems, particularly in unv...

read article arrow Read Article
Vaillant F28 Error Code - How to Fix?

29th May, 2026 Guides

Vaillant F28 Error Code - How...

Any time your boiler displays an error code, it can be a huge stressor, especially if it d...

read article arrow Read Article
Common Ideal Boiler Error Codes

29th May, 2026 Guides

Common Ideal Boiler Error Code...

The complete guide to what each Ideal boiler error code means and how to fix it!

read article arrow Read Article
How to Properly Ventilate a Boiler Room for Safety

29th May, 2026 Guides

How to Properly Ventilate a Bo...

Proper ventilation in a boiler room is essential for safety and efficiency. Without adequa...

read article arrow Read Article
How to Reset Ideal Logic Combi 30 Boiler

29th May, 2026 Guides

How to Reset Ideal Logic Combi...

Resetting an Ideal Logic Combi 30 boiler might be needed for a few reasons. Often, it is d...

read article arrow Read Article
How to Prevent Boiler Limescale

29th May, 2026 Guides

How to Prevent Boiler Limescal...

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

read article arrow Read Article
How long does it take to fit a new boiler?

29th May, 2026 Guides

How long does it take to fit a...

Most boiler installations take between one and two days depending on your current setup an...

read article arrow Read Article
Can a Boiler Lose Pressure Without a Leak?

29th May, 2026 Guides

Can a Boiler Lose Pressure Wit...

If your boiler keeps losing pressure but you can’t see a leak, it could be caused by trapp...

read article arrow Read Article
Boiler Service Glasgow

29th May, 2026 Guides

Boiler Service Glasgow

Boiler servicing is a comprehensive check involving numerous standard procedures to ensure...

read article arrow Read Article
Boiler Not Working? Most Common Problems (And Fixes)

29th May, 2026 Advice

Boiler Not Working? Most Commo...

A complete guide to getting that boiler working again and some common fault codes and how...

read article arrow Read Article
Baxi Boiler E125 Error Code

29th May, 2026 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