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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

Worcester Bosch Greenstar 8000 Life (Combi) Boiler Review

15th August, 2025 Reviews

Worcester Bosch Greenstar 8000...

Thinking of buying a Worcester Bosch Greenstar 8000 Life Boiler? Find out iHeat's opinion...

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Is a Heat Pump Cheaper to Run Than a Boiler?

15th August, 2025 Comparisons

Is a Heat Pump Cheaper to Run...

In this UK heat pump vs new gas boiler comparison guide, we'll be taking a look at which t...

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Average Energy Bill UK

12th August, 2025 Guides

Average Energy Bill UK

The average electricity bill in the UK can vary based on many factors like location, consu...

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Home EV Charging Costs

12th August, 2025 Guides

Home EV Charging Costs

Electric Vehicle (EV) chargers are quantified by their power output in kilowatts (kW). Ele...

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Vaillant Boiler Flue Extension

12th August, 2025 Guides

Vaillant Boiler Flue Extension

This guide dives deep into what flue extensions are, why they are important, and how to in...

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How to Reset Viessmann Boiler

12th August, 2025 Guides

How to Reset Viessmann Boiler

Resetting a boiler is an important step when dealing with various system faults or issues....

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Hive Alfen Eve S Line EV Charger Review

12th August, 2025 Reviews

Hive Alfen Eve S Line EV Charg...

The Hive Alfen Eve S-Line EV Charger emerges as a reliable solution for home charging, mar...

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Vaillant Air Source Heat Pumps

11th August, 2025 Guides

Vaillant Air Source Heat Pumps

Air source heat pumps can be an extremely cost effective and efficient method of heating y...

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Boiler Timer Guide

11th August, 2025 Guides

Boiler Timer Guide

A boiler timer is an essential component of your heating system, allowing you to control w...

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Ideal Logic+ Heat Only Boiler Review

11th August, 2025 Reviews

Ideal Logic+ Heat Only Boiler...

Today we will be reviewing the Ideal Logic + heat only boiler, specifically in its 18kW ca...

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Do I Need A Boiler Service?

11th August, 2025 Advice

Do I Need A Boiler Service?

Does a boiler need an annual service? We run through boiler services and some frequently a...

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Worcester Bosch 8000 Boiler Review

11th August, 2025 Reviews

Worcester Bosch 8000 Boiler Re...

The Worcester Bosch 8000 boiler comes straight from one of the UK's best-selling boiler br...

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