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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

Boiler Manifold - Role, Function, and Cost Guide

29th May, 2026 Guides

Boiler Manifold - Role, Functi...

A boiler manifold is a vital component in many heating systems. It acts as the central hub...

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Where is the Boiler Fuse Located?

29th May, 2026 Guides

Where is the Boiler Fuse Locat...

A boiler fuse is a small yet crucial electrical component found within a boiler system. It...

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

29th May, 2026 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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What is a Tundish?

29th May, 2026 Guides

What is a Tundish?

A tundish is a small yet essential component found in heating systems, particularly in unv...

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Vaillant F28 Error Code - How to Fix?

29th May, 2026 Guides

Vaillant F28 Error Code - How...

Any time your boiler displays an error code, it can be a huge stressor, especially if it d...

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How to Properly Ventilate a Boiler Room for Safety

29th May, 2026 Guides

How to Properly Ventilate a Bo...

Proper ventilation in a boiler room is essential for safety and efficiency. Without adequa...

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How to Prevent Boiler Limescale

29th May, 2026 Guides

How to Prevent Boiler Limescal...

Limescale, primarily composed of calcium carbonate, is a persistent problem in many boiler...

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Can a Boiler Lose Pressure Without a Leak?

29th May, 2026 Guides

Can a Boiler Lose Pressure Wit...

If your boiler keeps losing pressure but you can’t see a leak, it could be caused by trapp...

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Can Air Conditioning Remove Humidity from Your Home?

28th May, 2026 Guides

Can Air Conditioning Remove Hu...

Yes, air conditioning can help reduce humidity levels inside your home by removing excess...

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How Air Conditioning Can Help Reduce Hay Fever and Allergies

22nd May, 2026 Advice

How Air Conditioning Can Help...

Air conditioning can help reduce some hay fever and allergy symptoms by improving airflow...

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Why Does the Air Conditioner Smell Bad?

22nd May, 2026 Advice

Why Does the Air Conditioner S...

Air conditioning smells are usually caused by moisture, dust, or dirty filters building up...

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Can Air Conditioning Improve Indoor Air Quality?

22nd May, 2026 Guides

Can Air Conditioning Improve I...

Air conditioning can help improve indoor air quality by improving airflow, reducing humidi...

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