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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

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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Boiler Installation Cost Calculator

03rd February, 2026 Guides

Boiler Installation Cost Calcu...

Unlock the insights you need to estimate boiler costs in the UK accurately. Our comprehens...

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Boilers on Finance - The Best Pay Monthly and 0% Interest Deal

03rd February, 2026 Guides

Boilers on Finance - The Best...

Buying a boiler on finance can be hard with all the different options available. Let us ex...

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The Benefits of Using a Hive Thermostat for Your Smart Home

03rd February, 2026 Guides

The Benefits of Using a Hive T...

If you're looking to upgrade your home to a smart home, one of the best investments you ca...

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Baxi Platinum+ System Boiler Review

03rd February, 2026 Reviews

Baxi Platinum+ System Boiler R...

At iHeat, we pride ourselves on offering the finest heating solutions to our customers. To...

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What is a Smart Home and Smart Boiler?

03rd February, 2026 Guides

What is a Smart Home and Smart...

Smart boilers are an innovative technology that can help homeowners save money on their en...

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Boiler Warranties & Guarantees: Top UK Brands for Best Value

02nd February, 2026 Guides

Boiler Warranties & Guarantees...

Boiler warranties and guarantees are essential aspects to consider when investing in a new...

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Is it Cheaper to Replace Your Boiler in Summer?

02nd February, 2026 Guides

Is it Cheaper to Replace Your...

You may be wondering when the best time to replace your old, inefficient boiler is, and wh...

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