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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 C6 Boiler Error Code

05th February, 2026 Guides

Worcester Bosch C6 Boiler Erro...

When it comes to home heating, a reliable and efficient boiler is essential. However, boil...

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What Are Biomass Boilers And Heating Systems?

05th February, 2026 Advice

What Are Biomass Boilers And H...

Biomass is an environmentally considerate and renewable energy source, generated from the...

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Emergency Boiler Replacement

05th February, 2026 Guides

Emergency Boiler Replacement

Lets explore the process of assessing and replacing an older, antiquated broken down appli...

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Worcester Bosch Vs Viessmann Boilers

05th February, 2026 Comparisons

Worcester Bosch Vs Viessmann B...

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

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Worcester Bosch Greenstar CDi Compact Combi Review

05th February, 2026 Reviews

Worcester Bosch Greenstar CDi...

One of the most popular compact combi boilers on the market, here we take an in depth look...

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Worcester Bosch Greenstar 2000 Boiler Review

05th February, 2026 Reviews

Worcester Bosch Greenstar 2000...

Worcester Bosch has a new range of condensing combi boilers, including the Worcester Bosch...

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Worcester Boiler Flashing Blue Light No Error Code

05th February, 2026 Guides

Worcester Boiler Flashing Blue...

Boiler error codes serve as essential diagnostics tools that help identify specific issues...

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What Type of Boiler Is Right for Me?

05th February, 2026 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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What is Boiler Modulation?

05th February, 2026 Guides

What is Boiler Modulation?

A modulating boiler not only adjusts its output to meet the varying heat demands of your h...

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What is a Boiler PCB?

05th February, 2026 Guides

What is a Boiler PCB?

Our helpful PCB blog provides a comprehensive explanation of the Printed Circuit Board (PC...

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

05th February, 2026 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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Vokera Boiler Red Light

05th February, 2026 Guides

Vokera Boiler Red Light

When a Vokera boiler presents a red light, it often indicates a lockout due to safety mech...

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