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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.

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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 an Airing Cupboard?

16th October, 2025 Guides

What is an Airing Cupboard?

An airing cupboard is a small space used to store and dry laundry, usually located near th...

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Boiler Not Working? Most Common Problems (And Fixes)

16th October, 2025 Advice

Boiler Not Working? Most Commo...

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

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Boilers on Finance - The Best Pay Monthly and 0% Interest Deal

16th October, 2025 Guides

Boilers on Finance - The Best...

Buying a boiler on finance can be hard with all the different options available. Let us ex...

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Understanding Boiler kW (Kilowatts) & How To Measure

16th October, 2025 Guides

Understanding Boiler kW (Kilow...

When it comes to choosing a boiler for your home, understanding the concept of kilowatts (...

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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...

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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...

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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.

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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...

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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...

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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...

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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...

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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...

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