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

How to Power Your Boiler with Solar Panels

18th March, 2026 Advice

How to Power Your Boiler with...

Solar panels can lower energy use, but most combi boilers are not directly powered by sola...

read article arrow Read Article
F83 Vaillant Error Code

18th March, 2026 Guides

F83 Vaillant Error Code

A Vaillant F83 fault usually means the boiler is not detecting the temperature rise it exp...

read article arrow Read Article
F29 Vaillant Fault Code

17th March, 2026 Guides

F29 Vaillant Fault Code

A Vaillant F29 error usually means your boiler has failed to ignite due to a flame loss, o...

read article arrow Read Article
Boiler Servicing Guide

16th March, 2026 Advice

Boiler Servicing Guide

Boiler servicing is an annual inspection carried out by a Gas Safe engineer to check that...

read article arrow Read Article
Air Conditioners vs Air Coolers: What’s Best for UK Homes in 2026?

13th March, 2026 Comparisons

Air Conditioners vs Air Cooler...

Understand the key differences between air conditioners and air coolers to choose the best...

read article arrow Read Article
Boiler Overflow Pipe Leaking

06th March, 2026 Advice

Boiler Overflow Pipe Leaking

A leaking overflow pipe often means your boiler is releasing excess water due to high pres...

read article arrow Read Article
How the Iran-US conflict could affect UK energy bills

05th March, 2026 News

How the Iran-US conflict could...

Rising tensions in the Middle East can influence global oil and gas markets, which can eve...

read article arrow Read Article
Best Condensing Boilers 2026

27th February, 2026 Guides

Best Condensing Boilers 2026

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

read article arrow Read Article
Vaillant Boiler Parts 2026

26th February, 2026 Guides

Vaillant Boiler Parts 2026

Vaillant boilers use a variety of parts to ensure efficient operation. This section looks...

read article arrow Read Article
Most Economical Way to Use Central Heating UK

26th February, 2026 Guides

Most Economical Way to Use Cen...

Leaving the heating on low all day might seem like a way to avoid the chill without bursti...

read article arrow Read Article
Combi Boiler Pipes Explained

26th February, 2026 Guides

Combi Boiler Pipes Explained

Understanding the key components of combi boiler pipework is essential for making informed...

read article arrow Read Article
Boiler Installation Birmingham

26th February, 2026 Guides

Boiler Installation Birmingham

When contemplating a new boiler installation in Birmingham during 2026, homeowners should...

read article arrow Read Article