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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

New Gas Boiler Technology & Features

06th February, 2026 Guides

New Gas Boiler Technology & Fe...

Modern gas boilers can offer significant advantages over older, less efficient models, fro...

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Viessmann Heat Pump - 2026 UK Guide

06th February, 2026 Reviews

Viessmann Heat Pump - 2026 UK...

Viessmann offers an impressive range of heat pumps in the UK for 2026, catering to various...

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Does a Worcester Bosch Boiler Need a Service?

06th February, 2026 Guides

Does a Worcester Bosch Boiler...

Regular maintenance of Worcester Bosch boilers is essential to ensure safety and efficienc...

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Oil Boiler Not Firing Up - Common Causes and fixes

06th February, 2026 Guides

Oil Boiler Not Firing Up - Com...

An oil boiler often refuses to start due to common issues like empty oil tanks, power supp...

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Boiler Warranty Invalid? Warranty Checklist

06th February, 2026 Guides

Boiler Warranty Invalid? Warra...

This article explains what a boiler warranty covers, what actions can invalidate it, and h...

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Boiler Parts and Their Functions

06th February, 2026 Guides

Boiler Parts and Their Functio...

Understanding the different parts of a boiler and their functions is essential for homeown...

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Electric Boiler Service

06th February, 2026 Guides

Electric Boiler Service

Electric boilers are popular in many UK homes due to their efficiency and compatibility wi...

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Retrofitting Heat Pumps in Existing Homes: The Pros, Cons, and Key Considerations

06th February, 2026 Guides

Retrofitting Heat Pumps in Exi...

Retrofitting a heat pump replaces or supplements traditional heating methods with modern,...

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Baxi Boiler Error Codes

06th February, 2026 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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AI Technology in Home Heating: The Future of Efficiency?

06th February, 2026 Guides

AI Technology in Home Heating:...

Artificial Intelligence (AI) is changing home heating by introducing smarter, more efficie...

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Pressure Release Valve Boiler

06th February, 2026 Guides

Pressure Release Valve Boiler

A pressure release valve (PRV) on a boiler is a critical safety component ensuring that th...

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Boiler Ticking Noise

06th February, 2026 Guides

Boiler Ticking Noise

When a boiler starts making a ticking noise, it's crucial to carefully examine the source...

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