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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

Best Heat Pumps For Underfloor Heating

30th May, 2025 Guides

Best Heat Pumps For Underfloor...

There has been a lot of hype surrounding heat pumps within the heating industry as of late...

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Best Baxi Boilers (Prices & Reviews) Which Is The Best?

30th May, 2025 Guides

Best Baxi Boilers (Prices & Re...

Baxi is an affordable, top-notch home heating brand and in this article we will be explori...

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Gas Boiler vs Electric Boiler: Which Is Best?

30th May, 2025 Comparisons

Gas Boiler vs Electric Boiler:...

The cost of running an electric boiler can be high, especially if you live in the UK. Let'...

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What Is A Thermostatic Radiator Valve (TRV)?

30th May, 2025 Advice

What Is A Thermostatic Radiato...

As the colder months are beginning to set in, you may want to increase the temperatures em...

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Ideal Logic Max Combi Boiler Review

30th May, 2025 Reviews

Ideal Logic Max Combi Boiler R...

With over a century of being at the forefront of the heating industry, Ideal has helped re...

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Vaillant Boiler Error Codes

30th May, 2025 Guides

Vaillant Boiler Error Codes

Read all about the most common Vaillant boiler error codes, what they mean and how you can...

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Worcester Bosch Greenstar 4000 System Boiler Review

30th May, 2025 Reviews

Worcester Bosch Greenstar 4000...

Today we will review the Worcester Bosch Greenstar 4000 System Boiler, and whether this sy...

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Gas Safety Week - iHeat Proudly Supporting 2022

30th May, 2025 News

Gas Safety Week - iHeat Proudl...

With Gas Safety week imminent, We here at iHeat understand the value of such initiatives,...

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A History of Ideal Boilers

30th May, 2025 Guides

A History of Ideal Boilers

Here we will take a look at some of the key moments in Ideal's inertia, development and ho...

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The History Of Worcester Bosch Boilers

30th May, 2025 Guides

The History Of Worcester Bosch...

In this blog we will take a look at the rich lineage of the brand, and how Worcester Bosch...

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System Boilers vs Combi Boilers

30th May, 2025 Comparisons

System Boilers vs Combi Boiler...

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

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What is a CP12 Landlord Gas Safety Certificate?

30th May, 2025 Advice

What is a CP12 Landlord Gas Sa...

If you're a landlord, you may have heard of a CP12 - but what exactly is it? Let us explai...

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