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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

No Water Coming Out Of Hot Tap (Combi Boiler)

05th June, 2025 Guides

No Water Coming Out Of Hot Tap...

Addressing the lack of hot water from a tap usually starts with understanding how a combi...

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What Should Boiler Pressure Be When Heating is Off?

05th June, 2025 Guides

What Should Boiler Pressure Be...

The efficiency and safety of a home's heating system hinge on maintaining the correct boil...

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Boiler Flue Regulations

04th June, 2025 Guides

Boiler Flue Regulations

A boiler flue is a critical component that helps expel harmful gases from your home, ensur...

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What to do with Your Boiler when You Go on Holiday

02nd June, 2025 Advice

What to do with Your Boiler wh...

The last thing you want to be thinking about while you're enjoying your summer holidays, o...

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Monobloc vs. Split Heat Pumps: Which One Is Right for Your Home?

30th May, 2025 Comparisons

Monobloc vs. Split Heat Pumps:...

Choosing between a monobloc and a split heat pump depends on several factors. Key consider...

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Boiler Pump Not Working

30th May, 2025 Guides

Boiler Pump Not Working

A boiler pump is a vital part of a heating system. It ensures water is circulated efficien...

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How to Link a Wood Burner to Your Central Heating (UK Guide)

30th May, 2025 Guides

How to Link a Wood Burner to Y...

Connecting a wood burner to your central heating system can be an efficient way to heat yo...

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Electric Boiler Vs Heat Pump

30th May, 2025 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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What Size Air Source Heat Pump Do You Need?

30th May, 2025 Guides

What Size Air Source Heat Pump...

Air source heat pumps (ASHP) are popular for providing efficient heating solutions. These...

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Ground Source Heat Pump Installation

30th May, 2025 Guides

Ground Source Heat Pump Instal...

Ground source heat pumps (GSHPs) can be a great way to meet heating needs for both homes a...

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Hybrid Air Source Heat Pump and Gas Boiler

30th May, 2025 Guides

Hybrid Air Source Heat Pump an...

A hybrid air source heat pump combines two effective technologies: an air source heat pump...

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What is Boiler Pump Overrun? - Functions, Issues, and Fixes

30th May, 2025 Guides

What is Boiler Pump Overrun? -...

Pump overrun in boilers is a feature that helps cool down the system and manage residual h...

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