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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 an Inverter Air Conditioner and How Does It Work?

14th August, 2026 Guides

What Is an Inverter Air Condit...

An inverter air conditioner adjusts its compressor speed to match your home's heating or c...

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Air-Conditioning Warranties Explained: What Is and Isn’t Covered?

06th August, 2026 Guides

Air-Conditioning Warranties Ex...

Air conditioning warranties can provide valuable protection against manufacturing defects,...

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Best Oil Boilers 2026

13th 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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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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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 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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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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How Much Does a Boiler Power Flush Cost?

25th June, 2026 Advice

How Much Does a Boiler Power F...

A boiler power flush usually costs between £300 and £700, depending on the size and condit...

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Power Flush vs Chemical Flush

25th June, 2026 Comparisons

Power Flush vs Chemical Flush

A chemical flush is best for light sludge, while a power flush is designed for more seriou...

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What Should Boiler Pressure Be When Heating is Off?

22nd June, 2026 Guides

What Should Boiler Pressure Be...

Most boilers should read between 1.0 and 1.5 bar when the heating is off and the system is...

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