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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 Finance Explained: Options, Costs and Eligibility

28th September, 2026 Guides

Boiler Finance Explained: Opti...

Boiler finance allows eligible homeowners to spread the cost of a new boiler through fixed...

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Viessmann 222-F Boiler Review

28th September, 2026 Reviews

Viessmann 222-F Boiler Review

Viessmann is an international brand with over a century of trusted design and application,...

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Viessmann Combi Boiler Costs

28th September, 2026 Guides

Viessmann Combi Boiler Costs

Viessmann combi boilers are renowned for their efficiency and technological advancement.

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Vokera Boilers Prices 2026

28th September, 2026 Reviews

Vokera Boilers Prices 2026

Vokera is an established and innovative brand, providing highly efficient home heating, wh...

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When Should You Replace Your Boiler?

28th September, 2026 Guides

When Should You Replace Your B...

It can cost a lot to get the right boiler installed into your home, which is why a lot of...

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How Old is My Boiler and When to Consider a Replacement?

28th September, 2026 Guides

How Old is My Boiler and When...

A modern, efficient boiler can operate at over 90% efficiency, leading to significant savi...

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Energy Saving With Your Boiler

28th September, 2026 Advice

Energy Saving With Your Boiler

For most homes in the UK, the cost of heating and hot water can be very pricey. That's why...

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At What Age Should You Replace A Boiler?

28th September, 2026 Advice

At What Age Should You Replace...

Your boiler is one of the most important appliances in your home. It is responsible for ke...

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How to Repressurise a Baxi Boiler

28th September, 2026 Guides

How to Repressurise a Baxi Boi...

Repressurising a Baxi boiler means restoring the correct water pressure inside the boiler...

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Potterton Boiler Flashing Green

28th September, 2026 Guides

Potterton Boiler Flashing Gree...

A Potterton boiler displaying a flashing green light can indicate various issues. When no...

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The Best Smart Thermostats in the UK 2026

28th September, 2026 Guides

The Best Smart Thermostats in...

A smart thermostat can make a massive difference to your home and can be one of the best...

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How to Improve Radiator Efficiency & Performance

28th September, 2026 Guides

How to Improve Radiator Effici...

Radiator efficiency plays a key role in maintaining a comfortable and cost-effective home....

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