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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

Baxi Boiler Error Codes

30th May, 2025 Guides

Baxi Boiler Error Codes

The complete guide to what each Baxi boiler error code means and how to fix it!

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What is a Boiler Filling Loop? In-Depth UK Guide

30th May, 2025 Advice

What is a Boiler Filling Loop?...

When it comes to Boilers, there can be some confusing jargon. Just what exactly is a Boile...

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Common Ideal Boiler Error Codes

30th May, 2025 Guides

Common Ideal Boiler Error Code...

The complete guide to what each Ideal boiler error code means and how to fix it!

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Best Eco Friendly Boilers for 2025

30th May, 2025 Guides

Best Eco Friendly Boilers for...

The UK Government has set out its net-zero carbon emissions by 2050 target and have starte...

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Ideal Logic+ Combi Review

30th May, 2025 Reviews

Ideal Logic+ Combi Review

In this guide, we will be reviewing the Ideal Logic+ combi boiler, taking a look at its fe...

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Worcester Bosch Greenstar 4000 Combi

30th May, 2025 Reviews

Worcester Bosch Greenstar 4000...

An in-depth review of the Worcester Bosch Greenstar 4000 Combi boiler, taking a look at it...

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Carbon Monoxide & Boiler Safety Guide

30th May, 2025 Advice

Carbon Monoxide & Boiler Safet...

Throughout the colder months, many of us use our boilers on a daily basis to warm our home...

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Alpha E-Tec Boilers | A Guide to the Range

30th May, 2025 Reviews

Alpha E-Tec Boilers | A Guide...

Founded in 1966, Alpha Heating Innovation is recognised as one of the leaders of the UK’s...

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Open Vented Boilers: What are they and do you need one?

30th May, 2025 Guides

Open Vented Boilers: What are...

In this guide, we are going to talk about what an open vent heating system is, how it work...

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Difference Between LPG and Natural Gas

30th May, 2025 Advice

Difference Between LPG and Nat...

In this article, we’re going to be explaining some ways in which you can identify whether...

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Arranging a Boiler Service

30th May, 2025 Advice

Arranging a Boiler Service

Whilst a boiler service might seem like an unnecessary added cost each year, it really is...

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What Is A MagnaClean?

30th May, 2025 Advice

What Is A MagnaClean?

You may have heard of MagnaClean (sometimes accidentally called Magna Clean) before, but w...

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