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

Glow Worm F1 Fault

04th February, 2026 Guides

Glow Worm F1 Fault

Boiler error codes are critical indicators for diagnosing heating system issues. They serv...

read article arrow Read Article
Glow Worm Boiler Review: Ultimate₃ Combi

04th February, 2026 Reviews

Glow Worm Boiler Review: Ultim...

Combi boilers, or combination boilers, epitomise efficiency and convenience in modern home...

read article arrow Read Article
Glow Worm Boiler Pressure

04th February, 2026 Guides

Glow Worm Boiler Pressure

To keep your Glow-Worm boiler working properly, it's essential to maintain the right press...

read article arrow Read Article
Glow Worm Boiler Not Firing Up No Fault Code

04th February, 2026 Guides

Glow Worm Boiler Not Firing Up...

Boiler error codes are a critical feature intended to assist in the diagnosis of issues wi...

read article arrow Read Article
Why is My Radiator So Noisy?

04th February, 2026 Guides

Why is My Radiator So Noisy?

Radiators can emit a variety of sounds, each indicating a different potential issue within...

read article arrow Read Article
F54 Vaillant Boiler Fault Code

04th February, 2026 Guides

F54 Vaillant Boiler Fault Code

Boiler error codes are numeric or alphanumeric messages displayed on the boiler's interfac...

read article arrow Read Article
Electric Boiler vs Gas Boiler

04th February, 2026 Comparisons

Electric Boiler vs Gas Boiler

In this article we will discuss the topic of different boiler types, specifically electric...

read article arrow Read Article
E1 Error Code - How To Fix

04th February, 2026 Guides

E1 Error Code - How To Fix

When a boiler starts displaying an error code out of the blue it can be a shock to the sys...

read article arrow Read Article
Condensing Boilers vs Combi Boilers

04th February, 2026 Comparisons

Condensing Boilers vs Combi Bo...

In this guide, we’re going to be explaining what each of these terms mean so you know exac...

read article arrow Read Article
Central Heating Inhibitor

04th February, 2026 Advice

Central Heating Inhibitor

A central heating inhibitor can be a vital part of heating systems that many people forget...

read article arrow Read Article
How to Power Your Boiler with Solar Panels

04th February, 2026 Advice

How to Power Your Boiler with...

As more and more people become conscious of their impact on the environment and the ban on...

read article arrow Read Article
Boiler Short Cycling - Fixes

04th February, 2026 Guides

Boiler Short Cycling - Fixes

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

read article arrow Read Article