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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

Who Qualifies for a Boiler Grant in 2026?

20th May, 2026 Guides

Who Qualifies for a Boiler Gra...

Boiler grants in the UK assist homeowners in upgrading heating systems to more efficient m...

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Which Boiler Brands Do iHeat Stock?

20th May, 2026 Advice

Which Boiler Brands Do iHeat S...

At iHeat we want our customers to receive only the best boilers available, that’s why we s...

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When Should You Replace Radiators?

20th May, 2026 Advice

When Should You Replace Radiat...

While radiators are considered to be one of the most resilient things you have in your hom...

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What Type of Boiler Do I Have?

20th May, 2026 Advice

What Type of Boiler Do I Have?

Despite over 22 million UK homes having gas central heating, a great deal of homeowners ar...

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What is Central Heating Sludge?

20th May, 2026 Guides

What is Central Heating Sludge...

Sludge in a central heating system is a mix of dirt, rust, and limescale. Over time, these...

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What is Boiler Renting/Subscription?

20th May, 2026 Guides

What is Boiler Renting/Subscri...

Boiler renting, often regarded as a boiler subscription service, has emerged as a vital al...

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What is a Thermocouple?

20th May, 2026 Guides

What is a Thermocouple?

A thermocouple is a critical component in a boiler system. It acts as a safety device, ens...

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What Is A System Boiler?

20th May, 2026 Advice

What Is A System Boiler?

The best boiler for your home will be one that can meet the demands for hot water and cent...

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What Is A Powerflush?

20th May, 2026 Advice

What Is A Powerflush?

A powerflush is a kind of cleaning process for your central heating system that can remove...

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What is a Low Loss Header?

20th May, 2026 Guides

What is a Low Loss Header?

A low loss header is an essential part of a heating system. It acts as a bridge between th...

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What is a Heat Exchanger?

20th May, 2026 Guides

What is a Heat Exchanger?

Heat exchangers are pivotal devices within a boiler system, playing a crucial role in tran...

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What is a CP12 Landlord Gas Safety Certificate?

20th May, 2026 Advice

What is a CP12 Landlord Gas Sa...

If you're a landlord, you may have heard of a CP12 - but what exactly is it? Let us explai...

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