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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 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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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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Potterton Boiler E119 Error Code

30th May, 2025 Guides

Potterton Boiler E119 Error Co...

Navigating boiler error codes can be puzzling yet essential for preserving a fully functio...

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How Can I Increase My Water Pressure

30th May, 2025 Advice

How Can I Increase My Water Pr...

Having a low water pressure in your home can be frustrating and inconvenient.

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Vented vs Unvented Hot Water Cylinders

30th May, 2025 Comparisons

Vented vs Unvented Hot Water C...

Homes will need a new boiler every 10 to 15 years to ensure they are safe and running effi...

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Central Heating Boilers

30th May, 2025 Guides

Central Heating Boilers

How do you decide which boiler is actually right for your central heating needs?

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Heat Only Boilers

30th May, 2025 Guides

Heat Only Boilers

Buying a new boiler can be a stressful process. There are a lot of different systems to co...

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How to Fix a Faulty Heat Exchanger

30th May, 2025 Advice

How to Fix a Faulty Heat Excha...

In this guide, we’re going to be explaining what a heat exchanger is, some common causes f...

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Viessmann Vitodens - A Guide to the Range

30th May, 2025 Reviews

Viessmann Vitodens - A Guide t...

Viessmann is one of the best and most reliable boiler brands on the market with their adva...

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Diverter Valve

30th May, 2025 Advice

Diverter Valve

One of the most common reasons for heating and hot water to stop working properly is a fau...

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Boiler Inactive Over Summer? How to Avoid Needing Repairs

30th May, 2025 Advice

Boiler Inactive Over Summer? H...

Over the summer months, many of us tend to use our central heating much less and sometimes...

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