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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

Back Boiler Replacement Cost in the UK

30th September, 2026 Guides

Back Boiler Replacement Cost i...

Back boilers are outdated, inefficient, and pose safety risks. Upgrading to a combi boiler...

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Boiler Leaking Water? (How to Fix a Leaking Boiler)

30th September, 2026 Advice

Boiler Leaking Water? (How to...

If your boiler is leaking water, it’s likely due to pressure or worn parts. Acting fast he...

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Worcester Bosch boiler flashing blue light with no error code: what to check

30th September, 2026 Guides

Worcester Bosch boiler flashin...

A flashing blue light can indicate a fault on some Worcester boilers, but its exact meanin...

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Repressurise Vaillant Boiler

30th September, 2026 Guides

Repressurise Vaillant Boiler

Low pressure in a Vaillant boiler is a common issue for many UK households. It affects com...

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Ideal Boiler Status P How to Fix

30th September, 2026 Guides

Ideal Boiler Status P How to F...

Understanding the reasons behind the Status P error is essential for fixing it promptly. T...

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Vaillant Comfort Mode (and Flashing C on a Vaillant Boiler)

30th September, 2026 Guides

Vaillant Comfort Mode (and Fla...

Vaillant Comfort Mode is a feature available on Vaillant boilers designed to provide a con...

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How to Reset Ideal Logic Combi 30 Boiler

30th September, 2026 Guides

How to Reset Ideal Logic Combi...

Resetting an Ideal Logic Combi 30 boiler might be needed for a few reasons. Often, it is d...

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Egg Timer on Vaillant Boiler

30th September, 2026 Guides

Egg Timer on Vaillant Boiler

The egg timer symbol on a Vaillant boiler signifies the activation of the anti-cycling fun...

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Glow Worm Boiler Pressure

30th September, 2026 Guides

Glow Worm Boiler Pressure

To keep your Glow-Worm boiler working properly, it's essential to maintain the right press...

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How to Increase Pressure on Worcester Bosch Boiler Without Key

30th September, 2026 Guides

How to Increase Pressure on Wo...

A Worcester Bosch boiler is a complex machine with many components working together to hea...

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Vaillant Boiler Red Light

30th September, 2026 Guides

Vaillant Boiler Red Light

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

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Worcester Bosch Combi Boiler Hot Water Goes Cold

30th September, 2026 Guides

Worcester Bosch Combi Boiler H...

Ensuring consistent hot water supply in your Worcester Bosch combi boiler often necessitat...

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