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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

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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Boiler Ticking Noise

30th May, 2025 Guides

Boiler Ticking Noise

When a boiler starts making a ticking noise, it's crucial to carefully examine the source...

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Vokera Boiler Error Codes - How To Fix

30th May, 2025 Guides

Vokera Boiler Error Codes - Ho...

Familiarising yourself with common Vokera fault codes and their meanings can be crucial in...

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ATAG Boiler Error Codes - How To Fix

30th May, 2025 Guides

ATAG Boiler Error Codes - How...

When an ATAG boiler displays an error code, the meaning behind each code provides insight...

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Ideal L-F Error Code - How To Fix

30th May, 2025 Guides

Ideal L-F Error Code - How To...

When an Ideal boiler displays the L-F fault code, it is indicative of a flame loss issue....

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Biasi Boiler Error Codes - How To Fix

30th May, 2025 Guides

Biasi Boiler Error Codes - How...

Understanding the error codes on your Biasi boiler is the first step in troubleshooting. S...

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Vaillant F49 Boiler Error Code - How To Fix

30th May, 2025 Guides

Vaillant F49 Boiler Error Code...

The Vaillant F49 error code is a specific fault indicator on Vaillant boilers, signifying...

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