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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

Electric Boiler Vs Heat Pump

29th September, 2026 Comparisons

Electric Boiler Vs Heat Pump

Heat pumps capture heat from the air or ground. They are highly efficient, often achieving...

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Best Heat Pumps For Underfloor Heating

29th September, 2026 Guides

Best Heat Pumps For Underfloor...

There has been a lot of hype surrounding heat pumps within the heating industry as of late...

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Can You Install Air Conditioning in a Flat? Permissions and Options Explained

29th September, 2026 Guides

Can You Install Air Conditioni...

Yes, many flats can have air conditioning installed. The right system depends on your leas...

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Is Air Conditioning Allowed in New-Build Homes?

29th September, 2026 Guides

Is Air Conditioning Allowed in...

Yes, air conditioning is usually allowed in new-build homes, although property-specific re...

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Retrofitting Air Conditioning in Older Homes: What to Consider

29th September, 2026 Guides

Retrofitting Air Conditioning...

Yes, most older homes can have air conditioning installed, but factors such as insulation,...

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Does air conditioning bring fresh air into your home?

29th September, 2026 Guides

Does air conditioning bring fr...

Most home air conditioning systems do not bring fresh outside air into your home. Instead,...

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Where should you position an air conditioner in a bedroom?

29th September, 2026 Guides

Where should you position an a...

The best place for a bedroom air conditioner is high on a clear wall where it can circulat...

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How to Power Your Boiler with Solar Panels

29th September, 2026 Advice

How to Power Your Boiler with...

Solar panels can lower energy use, but most combi boilers are not directly powered by sola...

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Biasi Boiler Error Codes - How To Fix

29th September, 2026 Guides

Biasi Boiler Error Codes - How...

Some Biasi boiler error codes can clear with a reset, but others point to faults that need...

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Vaillant F72 Error Code - How To Fix

29th September, 2026 Guides

Vaillant F72 Error Code - How...

F72 usually points to a sensor fault or poor circulation in the heating system.

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Are You About to Spend Too Much on a New Boiler?

29th September, 2026 Guides

Are You About to Spend Too Muc...

Choose the right boiler and know your fixed installation price before you buy.

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Boiler Finance Explained: Options, Costs and Eligibility

29th September, 2026 Guides

Boiler Finance Explained: Opti...

Boiler finance allows eligible homeowners to spread the cost of a new boiler through fixed...

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