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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.

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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.

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

Floor Standing Boiler: Worcester Bosch Greenstar CDi Highflow Guide

11th August, 2025 Guides

Floor Standing Boiler: Worcest...

The Worcester Bosch Greenstar Highflow CDi series stands out with its floor-standing desig...

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Are Heat Only Boilers Still Used?

11th August, 2025 Guides

Are Heat Only Boilers Still Us...

Despite technological advancements, heat-only boilers remain a prevalent choice for many h...

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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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What Size Combi Boiler Do I Need?

11th August, 2025 Advice

What Size Combi Boiler Do I Ne...

Find out whether the size of your combi boiler will make any difference to its capabilitie...

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Baxi Combi Boiler Costs

11th August, 2025 Guides

Baxi Combi Boiler Costs

A newer, high-end Baxi combi boiler not only aims to save on space but can also offer sign...

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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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Electric Boiler vs Gas Boiler

11th August, 2025 Comparisons

Electric Boiler vs Gas Boiler

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

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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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Underfloor Heating with a Combi Boiler

11th August, 2025 Guides

Underfloor Heating with a Comb...

Integrating underfloor heating with existing combi boilers can be a practical option for m...

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What Is A System Boiler?

11th August, 2025 Advice

What Is A System Boiler?

The best boiler for your home will be one that can meet the demands for hot water and cent...

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Worcester Bosch Vs Viessmann Boilers

11th August, 2025 Comparisons

Worcester Bosch Vs Viessmann B...

Which boiler will come out the winner between these two powerhouse boiler manufactures!

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Can A Combi Boiler Run Hot Water and Heating Simultaneously?

11th August, 2025 Advice

Can A Combi Boiler Run Hot Wat...

You’ve likely heard of a combi boiler before and you may even have one in your home, contr...

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