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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

Vokera Boiler Flashing Green Light - How to Fix

30th May, 2025 Guides

Vokera Boiler Flashing Green L...

The green light is part of the boiler's diagnostic system; a flashing signal often points...

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How To Drain Central Heating System

30th May, 2025 Guides

How To Drain Central Heating S...

Understanding how to properly drain the system is vital for homeowners and DIY enthusiasts...

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Baxi Boiler Not Working, No Error Code

30th May, 2025 Guides

Baxi Boiler Not Working, No Er...

In the realm of boiler maintenance, two elements take centre stage: diagnosing issues and...

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Glow Worm Boiler Review: Ultimate₃ Combi

30th May, 2025 Guides

Glow Worm Boiler Review: Ultim...

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

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Worcester Bosch Greenstar Ri Heat-Only Boiler Review

30th May, 2025 Guides

Worcester Bosch Greenstar Ri H...

Heat-only boilers, also known as 'regular' or 'conventional' boilers, form a vital compone...

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Worcester Bosch Boiler E9 Fault

30th May, 2025 Guides

Worcester Bosch Boiler E9 Faul...

Boiler error codes are sequences of numbers or letters displayed on the control panel of y...

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Viessmann F4 Fault

30th May, 2025 Guides

Viessmann F4 Fault

Boiler error codes are critical indicators that help identify specific issues within a boi...

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Vaillant F23 Fault Code

30th May, 2025 Guides

Vaillant F23 Fault Code

When a boiler encounters a fault or malfunction, it communicates the problem through speci...

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Viessmann F2 Fault

30th May, 2025 Guides

Viessmann F2 Fault

Error codes are integral to the effective operation and maintenance of modern boilers. The...

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Ravenheat Boiler Error Codes

30th May, 2025 Guides

Ravenheat Boiler Error Codes

Error codes can range from ignition troubles to pressure fluctuations, each denoting a spe...

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F83 Vaillant Error Code

30th May, 2025 Guides

F83 Vaillant Error Code

Boiler error codes are essential indicators assisting in the diagnostics of potential issu...

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Baxi Megaflo Compact System - Boiler Review

30th May, 2025 Guides

Baxi Megaflo Compact System -...

The Baxi Megaflo Compact System boiler is a high-efficiency heating solution, designed wit...

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