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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 Installation Cost Calculator

03rd July, 2026 Guides

Boiler Installation Cost Calcu...

Estimate your boiler installation cost by considering your boiler type, property size and...

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Baxi Boiler Reviews

03rd July, 2026 Reviews

Baxi Boiler Reviews

Baxi, a significant player in the UK heating industry, has carved out a reputation for del...

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Common Ideal Boiler Error Codes

03rd July, 2026 Guides

Common Ideal Boiler Error Code...

The complete guide to what each Ideal boiler error code means and how to fix it!

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Glow Worm Boiler Reviews

03rd July, 2026 Reviews

Glow Worm Boiler Reviews

In 2026, Glow Worm continues to offer a broad range of boilers, each tailored to different...

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Best Boiler for Terraced House

02nd July, 2026 Guides

Best Boiler for Terraced House

Searching for the best boiler brand for terraced housing? Our guide compares the top-rated...

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Best Oil Boilers 2026

02nd July, 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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Best Boilers for Big Families (Large 5 Bedroom House)

02nd July, 2026 Guides

Best Boilers for Big Families...

For most large UK homes and big families, a system boiler with a correctly sized hot water...

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Best Combi Boilers In 2026

30th June, 2026 Guides

Best Combi Boilers In 2026

Compare the best combi boilers in 2026, including Worcester Bosch, Alpha, Vaillant and Vie...

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Ideal vs Worcester Bosch Boilers

30th June, 2026 Comparisons

Ideal vs Worcester Bosch Boile...

When choosing between an Ideal or Worcester Bosch boiler, it can be tricky to know which i...

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Bosch Climate 3200i - Review

29th June, 2026 Reviews

Bosch Climate 3200i - Review

The Bosch Climate 3200i is a modern air conditioning unit designed for UK homes. This syst...

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Best Boiler Brands in the UK (2026) Top Manufacturers

29th June, 2026 Guides

Best Boiler Brands in the UK (...

Compare the UK's top boiler manufacturers for 2026.

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Air Conditioning for Pet Owners: Is It Worth It in Summer?

26th June, 2026 Guides

Air Conditioning for Pet Owner...

A cooler home can help keep pets comfortable in summer.

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