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 Compact (Small) Combi Boiler in 2025

16th October, 2025 Guides

Best Compact (Small) Combi Boi...

When shopping for a boiler, many people forget to check the physical dimensions of each mo...

read article arrow Read Article
Best Budget Boiler

16th October, 2025 Guides

Best Budget Boiler

Choosing a cost-effective boiler in the UK that offers reliability and quality can seem ch...

read article arrow Read Article
The Best Combi Boilers in 2025

16th October, 2025 Guides

The Best Combi Boilers in 2025

Here’s a quick roundup of the best combi boilers for 2025.

read article arrow Read Article
How You Can Lower Your Heating Bill

16th October, 2025 Advice

How You Can Lower Your Heating...

The COVID-19 pandemic may have left you wondering how you can save money. We run through h...

read article arrow Read Article
What Type of Boiler Is Right for Me?

16th October, 2025 Guides

What Type of Boiler Is Right f...

Our guide explores the different types of boilers available, including combi, system, and...

read article arrow Read Article
Best Boiler for Terraced House

16th October, 2025 Guides

Best Boiler for Terraced House

Searching for the best boiler brand for terraced housing? Our guide compares the top-rated...

read article arrow Read Article
Alternatives to Gas Boilers: What are Your Options?

16th October, 2025 Guides

Alternatives to Gas Boilers: W...

As the UK moves toward a low-carbon future, switching from traditional gas boilers is beco...

read article arrow Read Article
Best Heating for Off-Grid Homes

16th October, 2025 Guides

Best Heating for Off-Grid Home...

Homes that are not connected to the mains gas grid in the UK need alternative heating syst...

read article arrow Read Article
How to Improve Radiator Efficiency & Performance

16th October, 2025 Guides

How to Improve Radiator Effici...

Radiator efficiency plays a key role in maintaining a comfortable and cost-effective home....

read article arrow Read Article
Reducing heat loss from your home

16th October, 2025 Guides

Reducing heat loss from your h...

Heat loss in a home happens when warm air escapes to the outside, and cold air infiltrates...

read article arrow Read Article
UK Government Boiler Scrappage Scheme 2025

16th October, 2025 Guides

UK Government Boiler Scrappage...

The UK Boiler Scrappage Scheme was a government initiative designed to promote the upgrade...

read article arrow Read Article
Clean Heat Market Mechanism (CHMM) 2025

16th October, 2025 News

Clean Heat Market Mechanism (C...

The Clean Heat Market Mechanism (CHMM) is a government policy designed to facilitate the t...

read article arrow Read Article