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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 Red Light

30th May, 2025 Guides

Vokera Boiler Red Light

When a Vokera boiler presents a red light, it often indicates a lockout due to safety mech...

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Boiler Repair Near Me

30th May, 2025 Guides

Boiler Repair Near Me

Boiler repair involves addressing issues with a boiler system, ensuring it functions safel...

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Flashing Radiator Symbol on Boiler

30th May, 2025 Guides

Flashing Radiator Symbol on Bo...

Recognising a flashing radiator symbol on a boiler's display is pivotal for maintaining ef...

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Potterton Boiler E119 Error Code

30th May, 2025 Guides

Potterton Boiler E119 Error Co...

Navigating boiler error codes can be puzzling yet essential for preserving a fully functio...

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Boiler Won't Turn Off

30th May, 2025 Guides

Boiler Won't Turn Off

When a boiler fails to turn off, it can lead to excessive energy usage and potentially har...

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Pressure Dropping on Boiler Every Day

30th May, 2025 Guides

Pressure Dropping on Boiler Ev...

Boiler pressure is the measure of balance between water and air within the central heating...

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Shower Going Hot and Cold - Combi Boiler

30th May, 2025 Guides

Shower Going Hot and Cold - Co...

Within homes across the UK, the combination boiler, commonly known as a combi boiler, serv...

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Glow Worm Boiler Not Firing Up No Fault Code

30th May, 2025 Guides

Glow Worm Boiler Not Firing Up...

Boiler error codes are a critical feature intended to assist in the diagnosis of issues wi...

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Why is My Boiler Making a Humming Noise?

30th May, 2025 Guides

Why is My Boiler Making a Humm...

Boiler noises are frequent issues that signal varied problems within the system. From slig...

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Boiler Service Bolton

30th May, 2025 Guides

Boiler Service Bolton

Boiler servicing comprises a set of inspections and tests conducted by a qualified enginee...

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How Can I Increase My Water Pressure

30th May, 2025 Advice

How Can I Increase My Water Pr...

Having a low water pressure in your home can be frustrating and inconvenient.

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Vented vs Unvented Hot Water Cylinders

30th May, 2025 Comparisons

Vented vs Unvented Hot Water C...

Homes will need a new boiler every 10 to 15 years to ensure they are safe and running effi...

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