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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

Egg Timer on Vaillant Boiler

03rd February, 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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How to Reset Ideal Logic Combi 30 Boiler

03rd February, 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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Vaillant Comfort Mode (and Flashing C on a Vaillant Boiler)

03rd February, 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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What Temperature For A Thermostat In Winter?

03rd February, 2026 Guides

What Temperature For A Thermos...

Thermostats are devices used to control the heating or cooling of a home. They function by...

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Boiler in Bathroom

03rd February, 2026 Guides

Boiler in Bathroom

Installing a boiler in a bathroom can be safe and legal in the UK, but specific regulation...

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What is Boiler Commissioning?

03rd February, 2026 Guides

What is Boiler Commissioning?

Boiler commissioning is an essential part of installing a new boiler system. It involves a...

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Who Qualifies for a Boiler Grant in 2026?

03rd February, 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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What is a Low Loss Header?

03rd February, 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 Boiler Renting/Subscription?

03rd February, 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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Will My Boiler Work If the Water Is Off?

03rd February, 2026 Guides

Will My Boiler Work If the Wat...

Turning off the water supply might cause concern about the boiler, but most boilers are bu...

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Hybrid Air Source Heat Pump and Gas Boiler

03rd February, 2026 Guides

Hybrid Air Source Heat Pump an...

A hybrid air source heat pump combines two effective technologies: an air source heat pump...

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Free Boiler Scheme/Grants 2026 - UPDATED

03rd February, 2026 Guides

Free Boiler Scheme/Grants 2026...

Navigating the landscape of grants can be complex, with schemes differing in their eligibi...

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