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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

Boiler Plus - 2025 Guide

12th August, 2025 Guides

Boiler Plus - 2025 Guide

Boiler Plus is a set of energy efficiency standards introduced by the UK government. It ai...

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Home EV Charging Costs

12th August, 2025 Guides

Home EV Charging Costs

Electric Vehicle (EV) chargers are quantified by their power output in kilowatts (kW). Ele...

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Vaillant Boiler Flue Extension

12th August, 2025 Guides

Vaillant Boiler Flue Extension

This guide dives deep into what flue extensions are, why they are important, and how to in...

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Vaillant PCB

12th August, 2025 Guides

Vaillant PCB

A Vaillant boiler Printed Circuit Board (PCB) is a vital part of a modern boiler system. I...

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How to Reset Viessmann Boiler

12th August, 2025 Guides

How to Reset Viessmann Boiler

Resetting a boiler is an important step when dealing with various system faults or issues....

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Vaillant Boiler No Hot Water

12th August, 2025 Guides

Vaillant Boiler No Hot Water

Understanding why a Vaillant boiler fails to provide hot water entails recognising the sig...

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Worcester Bosch Boiler Control Panel

12th August, 2025 Guides

Worcester Bosch Boiler Control...

Digital Controls are intuitive interfaces that allow homeowners to manage their heating sc...

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Air Source Heating - Air to Air Source Heat Pump

12th August, 2025 Guides

Air Source Heating - Air to Ai...

Air source heating harnesses environmental warmth to heat homes efficiently, utilizing a d...

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Home Boiler Cover - Mega Guide

12th August, 2025 Guides

Home Boiler Cover - Mega Guide

Home boiler cover acts as a safety net, ensuring that if a boiler breaks down or encounter...

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Does a Worcester Bosch Boiler Need a Service?

12th August, 2025 Guides

Does a Worcester Bosch Boiler...

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

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Combi Boiler Valve Positions Explained

12th August, 2025 Guides

Combi Boiler Valve Positions E...

With the advancements in boiler technology by 2025, understanding the various valve positi...

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Boiler Repair Bolton

12th August, 2025 Guides

Boiler Repair Bolton

In Bolton, boiler repair costs and procedures vary significantly depending on the type of...

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