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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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 Upgrade Scheme

12th August, 2025 Guides

Boiler Upgrade Scheme

The Boiler Upgrade Scheme is a pivotal initiative aimed at supporting the decarbonisation...

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Boiler Installation Glasgow

12th August, 2025 Guides

Boiler Installation Glasgow

Boiler installation is a critical process entailing the careful selection and fitting of a...

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Boiler Installation Manchester

12th August, 2025 Guides

Boiler Installation Manchester

A comprehensive understanding of the process is essential to ensure that the installation...

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Vaillant Boilers Reviews

12th August, 2025 Reviews

Vaillant Boilers Reviews

Vaillant offers an extensive selection of boilers to cater to different household requirem...

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Best Electric Combi Boiler

12th August, 2025 Guides

Best Electric Combi Boiler

An electric combi boiler is a compact unit that provides both central heating and hot wate...

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Boiler Warranties & Guarantees: Top UK Brands for Best Value

12th August, 2025 Guides

Boiler Warranties & Guarantees...

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

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Why is My Radiator So Noisy?

12th August, 2025 Guides

Why is My Radiator So Noisy?

Radiators can emit a variety of sounds, each indicating a different potential issue within...

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Boiler Hacks: Boost Performance & Savings

12th August, 2025 Guides

Boiler Hacks: Boost Performanc...

Boiler hacks are simple tricks and tips that can help you save money on your heating bills...

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How many hours should heating be on in the UK?

12th August, 2025 Guides

How many hours should heating...

Summary sentence for the blog: Learn the optimal duration for heating usage in the UK with...

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What is a Heat Exchanger?

11th August, 2025 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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Vaillant Air Source Heat Pumps

11th August, 2025 Guides

Vaillant Air Source Heat Pumps

Air source heat pumps can be an extremely cost effective and efficient method of heating y...

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Navien NCB 300 Boiler Review

11th August, 2025 Reviews

Navien NCB 300 Boiler Review

Unlocking the Efficiency and Value of the Navien NCB 300 Boiler: A Comprehensive Guide for...

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