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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

What Are Biomass Boilers And Heating Systems?

15th August, 2025 Advice

What Are Biomass Boilers And H...

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

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Is a Heat Pump Cheaper to Run Than a Boiler?

15th August, 2025 Comparisons

Is a Heat Pump Cheaper to Run...

In this UK heat pump vs new gas boiler comparison guide, we'll be taking a look at which t...

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Ideal Boiler Status 00 - How to Fix

15th August, 2025 Guides

Ideal Boiler Status 00 - How t...

Ideal boilers provide a variety of fault codes to help diagnose issues. Understanding thes...

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Average Energy Bill UK

12th August, 2025 Guides

Average Energy Bill UK

The average electricity bill in the UK can vary based on many factors like location, consu...

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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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Hive vs Nest - Best Smart Thermostat

12th August, 2025 Guides

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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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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