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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

Retrofitting Heat Pumps in Existing Homes: The Pros, Cons, and Key Considerations

20th May, 2026 Guides

Retrofitting Heat Pumps in Exi...

Retrofitting a heat pump replaces or supplements traditional heating methods with modern,...

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How to Properly Ventilate a Boiler Room for Safety

20th May, 2026 Guides

How to Properly Ventilate a Bo...

Proper ventilation in a boiler room is essential for safety and efficiency. Without adequa...

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How Much Energy/Electricity Do My Appliances Use? Expert advice

20th May, 2026 Guides

How Much Energy/Electricity Do...

Different appliances in your home use various amounts of electricity. Understanding this c...

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The Benefits of Zoned Heating for Energy Savings

20th May, 2026 Guides

The Benefits of Zoned Heating...

Zoned heating is a way to improve efficiency in heating and cooling systems. It divides a...

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Air Source Heating - Air to Air Source Heat Pump

20th May, 2026 Guides

Air Source Heating - Air to Ai...

Air source heating harnesses environmental warmth to heat homes efficiently, utilizing a d...

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Top 5 Reasons Your Thermostat Isn’t Working Properly

20th May, 2026 Guides

Top 5 Reasons Your Thermostat...

Regular maintenance and checks of both the thermostat and the heating and cooling system c...

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Worcester Bosch Climate 3200i - Review

20th May, 2026 Reviews

Worcester Bosch Climate 3200i...

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

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

20th 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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Dyson Air Con

20th May, 2026 Guides

Dyson Air Con

Dyson's 2026 range of air conditioning products offers a variety of models packed with adv...

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Best Bedroom Air Conditioning Units

20th May, 2026 Guides

Best Bedroom Air Conditioning...

When outfitting a bedroom with an air conditioner, it's crucial to understand the types av...

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Best Air Conditioning Units UK

20th 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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Air Conditioning Unit - Common Errors and Fixes

20th May, 2026 Guides

Air Conditioning Unit - Common...

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

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