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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

Boiler Pump Not Working

30th May, 2025 Guides

Boiler Pump Not Working

A boiler pump is a vital part of a heating system. It ensures water is circulated efficien...

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How to Link a Wood Burner to Your Central Heating (UK Guide)

30th May, 2025 Guides

How to Link a Wood Burner to Y...

Connecting a wood burner to your central heating system can be an efficient way to heat yo...

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What Size Air Source Heat Pump Do You Need?

30th May, 2025 Guides

What Size Air Source Heat Pump...

Air source heat pumps (ASHP) are popular for providing efficient heating solutions. These...

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What is Boiler Pump Overrun? - Functions, Issues, and Fixes

30th May, 2025 Guides

What is Boiler Pump Overrun? -...

Pump overrun in boilers is a feature that helps cool down the system and manage residual h...

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Why is My Boiler Making a Loud Vibrating Noise?

30th May, 2025 Guides

Why is My Boiler Making a Loud...

Several factors can lead to a boiler making loud vibrating noises. It's crucial to pinpoin...

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Boiler Filter - Mega Guide

30th May, 2025 Guides

Boiler Filter - Mega Guide

A boiler filter is an essential component for maintaining the efficiency and longevity of...

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How to Reset Vaillant Boiler

30th May, 2025 Guides

How to Reset Vaillant Boiler

The reset button on a Vaillant boiler typically has a small flame icon and can be found on...

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Ideal Boiler FU Fault Code: How to Fix

30th May, 2025 Guides

Ideal Boiler FU Fault Code: Ho...

The Ideal Boiler FU fault code indicates a significant difference in temperature between t...

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How to Connect Wireless Thermostat to Boiler

30th May, 2025 Guides

How to Connect Wireless Thermo...

Connecting a wireless thermostat to a boiler can help improve heating efficiency and contr...

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Electric Central Heating Boiler

30th May, 2025 Guides

Electric Central Heating Boile...

While electric boilers do offer many advantages, it's essential to weigh these against the...

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Vaillant Boiler Red Light

30th May, 2025 Guides

Vaillant Boiler Red Light

Understanding what the red light and associated fault codes mean is vital for boiler owner...

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F54 Vaillant Boiler Fault Code

30th May, 2025 Guides

F54 Vaillant Boiler Fault Code

Boiler error codes are numeric or alphanumeric messages displayed on the boiler's interfac...

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