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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

How Long Do Heat Pumps Last?

06th February, 2026 Guides

How Long Do Heat Pumps Last?

Heat pumps have an average lifespan of about 15 to 25 years depending on care, usage, and...

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How To Drain Central Heating System

06th February, 2026 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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Boiler Filter - Mega Guide

06th February, 2026 Guides

Boiler Filter - Mega Guide

A boiler filter is an essential component for maintaining the efficiency and longevity of...

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No Water Coming Out Of Hot Tap (Combi Boiler)

06th February, 2026 Guides

No Water Coming Out Of Hot Tap...

Addressing the lack of hot water from a tap usually starts with understanding how a combi...

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Boiler Heat Exchanger Replacement Cost

06th February, 2026 Guides

Boiler Heat Exchanger Replacem...

A boiler heat exchanger is a crucial component in heating systems. It allows heat transfer...

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Alpha Boilers Reviews

06th February, 2026 Reviews

Alpha Boilers Reviews

Alpha Boilers have ascended to notable esteem in the UK heating market, with a focal ethos...

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Are Old Boilers Expensive to Run?

06th February, 2026 Guides

Are Old Boilers Expensive to R...

Old boilers can be expensive to run, as they are often less efficient and more prone to br...

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What is the Cheapest Way to Heat a House?

06th February, 2026 Guides

What is the Cheapest Way to He...

Heating your home should not be a decision ruled by fear of overspending on your bills, es...

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F75 Vaillant Error Code

06th February, 2026 Guides

F75 Vaillant Error Code

One of the most common and frustrating error codes your Vaillant boiler can present to you...

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Moving Boiler To The Attic Or Garage

06th February, 2026 Advice

Moving Boiler To The Attic Or...

If you believe you would benefit from moving your boiler to a new location, either for fin...

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How much cheaper is a new boiler to run?

06th February, 2026 Guides

How much cheaper is a new boil...

New boilers are in fact much cheaper to run than old boilers, this is down to a number of...

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Heat Pumps: The Ultimate UK guide

06th February, 2026 Guides

Heat Pumps: The Ultimate UK gu...

As energy efficiency and environmental concerns continue to shape our choices, heat pumps...

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