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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

Portable Vs Wall-Mounted Air Conditioning: Which Is Better?

21st May, 2026 Comparisons

Portable Vs Wall-Mounted Air C...

Portable and wall mounted air conditioning both have their own strengths and drawbacks dep...

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Air Conditioning vs Fans: Which Is Better for UK Homes?

21st May, 2026 Comparisons

Air Conditioning vs Fans: Whic...

Air conditioning is better than a fan for most UK homes if you want proper cooling, better...

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Air Conditioning Running Costs UK 2026

21st May, 2026 Guides

Air Conditioning Running Costs...

Air conditioning running costs depend on how much electricity the unit uses, how long you...

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Best Air Conditioning Units UK

21st May, 2026 Guides

Best Air Conditioning Units UK

Air conditioning helps keep homes cool during heatwaves. This is especially important for...

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Best Air Conditioning Brands

21st May, 2026 Advice

Best Air Conditioning Brands

Find the best air conditioning brands in the UK for 2026, with a focus on performance, eff...

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Air Conditioning Maintenance Guide: Costs, Tips & Service Frequency

21st May, 2026 Guides

Air Conditioning Maintenance G...

Regular maintenance ensures efficient performance and longer lifespan for your air conditi...

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Air Conditioning for Loft Conversions: What You Need to Know

21st May, 2026 Guides

Air Conditioning for Loft Conv...

Air conditioning can work very well in loft conversions, especially in UK homes where loft...

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Air Conditioning Unit - Common Errors and Fixes

21st May, 2026 Guides

Air Conditioning Unit - Common...

Air conditioning systems are vital for maintaining a comfortable indoor environment, espec...

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Air Conditioning Installation Process: What to Expect

21st May, 2026 Guides

Air Conditioning Installation...

Most UK air conditioning installations are completed within one to two days, although setu...

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Can Air Conditioning Improve Indoor Air Quality?

21st May, 2026 Guides

Can Air Conditioning Improve I...

Air conditioning can help improve indoor air quality by improving airflow, reducing humidi...

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Boiler Losing Pressure, What Should You Do (How To Fix)

21st May, 2026 Advice

Boiler Losing Pressure, What S...

A boiler losing pressure is usually caused by a leak, trapped air, or a faulty valve - her...

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Are Heat Pumps More Efficient than Gas Boilers?

21st May, 2026 Comparisons

Are Heat Pumps More Efficient...

This blog comprehensively compares heat pumps and gas boilers, focusing on their efficienc...

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