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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

Radiators Not Heating Up: How to Fix?

18th October, 2025 Guides

Radiators Not Heating Up: How...

If your radiators aren’t heating up, it could be caused by a few things, such as trapped a...

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How much does a new boiler cost in the UK

18th October, 2025 Guides

How much does a new boiler cos...

New boiler cost can be a baffling topic, but our iHeat expert guide will clear things up!

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Best Boiler Brands in the UK (2025) Top Manufacturers

18th October, 2025 Guides

Best Boiler Brands in the UK (...

Choose the best boiler brand for your home with the iHeat easy guide.

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Glow Worm Boiler Review: Ultimate₃ Combi

18th October, 2025 Reviews

Glow Worm Boiler Review: Ultim...

Combi boilers, or combination boilers, epitomise efficiency and convenience in modern home...

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Vaillant Ecotec Pro Review

18th October, 2025 Reviews

Vaillant Ecotec Pro Review

Vaillant's Ecotec Pro combi boiler series is renowned for providing efficient heating and...

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Viessmann Heat Pump - 2025 UK Guide

18th October, 2025 Reviews

Viessmann Heat Pump - 2025 UK...

Viessmann offers an impressive range of heat pumps in the UK for 2025, catering to various...

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Hive vs Nest - Best Smart Thermostat

18th October, 2025 Reviews

Hive vs Nest - Best Smart Ther...

When choosing a smart thermostat, the Nest and Hive are top contenders. Each offers key fe...

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This Valentine's Day we’re asking - Does the size of your pipe really matter? 2025

18th October, 2025 Guides

This Valentine's Day we’re ask...

This Valentine’s Day we want to let you in on a dirty little secret…

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How to Reset Ideal Logic Combi 30 Boiler

18th October, 2025 Guides

How to Reset Ideal Logic Combi...

Resetting an Ideal Logic Combi 30 boiler might be needed for a few reasons. Often, it is d...

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Can a Boiler Explode?

18th October, 2025 Guides

Can a Boiler Explode?

Boilers are a key part of many homes, but they can pose risks if not properly maintained....

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No Power to Boiler

18th October, 2025 Guides

No Power to Boiler

Understanding the various reasons why a boiler may not switch on can save homeowners time...

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Boiler Leaking Water? (How to Fix a Leaking Boiler)

17th October, 2025 Advice

Boiler Leaking Water? (How to...

If you notice water leaking from your boiler, it’s important to find out what’s causing it...

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