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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

How much does a new boiler cost in the UK

05th January, 2026 Guides

How much does a new boiler cos...

Based on data from over 7000 boiler installations completed by iHeat in the past 12 months...

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Best Home EV Chargers

05th January, 2026 Guides

Best Home EV Chargers

Electric vehicles (EVs) have transformed the way we think about personal transportation, n...

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Most Energy Efficient Boilers in 2026 (UK Guide)

05th January, 2026 Guides

Most Energy Efficient Boilers...

The efficiency of your boiler may not be something you pay much attention to, but is it co...

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Best UK Boiler Cover 2026

05th January, 2026 Guides

Best UK Boiler Cover 2026

A broken boiler often means a cold house with no access to heating or hot water, leaving m...

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Best Electric Boilers 2026

05th January, 2026 Guides

Best Electric Boilers 2026

The best electric boilers in 2026 include models from Electric Heating Company, Heatrae Sa...

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Best Oil Boilers 2026

05th January, 2026 Guides

Best Oil Boilers 2026

Various benefits come from having an oil boiler installed in your home, and this could be...

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The Best LPG Combi Boilers 2026

05th January, 2026 Guides

The Best LPG Combi Boilers 202...

You may have heard of LPG boilers before, but even if you are not familiar with them, they...

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The Best Smart Thermostats in the UK 2026

05th January, 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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Best Condensing Boilers 2026

05th January, 2026 Guides

Best Condensing Boilers 2026

Condensing boilers are considered to be some of the most efficient boilers out there on th...

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Best Boiler Brands in the UK (2026) Top Manufacturers

05th January, 2026 Guides

Best Boiler Brands in the UK (...

Choose the best boiler brand for your home with the iHeat easy guide.

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Boiler Brands To Avoid - Worst Boilers in 2026

05th January, 2026 Guides

Boiler Brands To Avoid - Worst...

Looking for a guide to which boilers you shouldn’t buy? Look no further.

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Best Eco Friendly Boilers for 2026

05th January, 2026 Guides

Best Eco Friendly Boilers for...

The UK Government has set out its net-zero carbon emissions by 2050 target and have starte...

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