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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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

Boiler Losing Pressure, What Should You Do?

14th October, 2025 Advice

Boiler Losing Pressure, What S...

If your boiler is losing pressure you should identify the cause as soon as possible.

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Boiler Not Responding To Thermostat

14th October, 2025 Advice

Boiler Not Responding To Therm...

When your boiler isn’t responding to its thermostat, or vice versa, it can be tricky to id...

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Hive App Not Working? Here's Why And How to Fix

14th October, 2025 Guides

Hive App Not Working? Here's W...

The Hive thermostat is a popular smart home device that can help you control your heating...

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Best Boiler Brands UK: (October 2025 List)

14th October, 2025 Guides

Best Boiler Brands UK: (Octobe...

Choose the best boiler brand for your home with the iHeat easy guide.

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Worcester Bosch Combi Boiler Costs

10th October, 2025 Guides

Worcester Bosch Combi Boiler C...

With the colder months quickly approaching (sigh), a new, efficient Worcester Bosch combi...

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What is Boiler Renting/Subscription?

10th October, 2025 Guides

What is Boiler Renting/Subscri...

Boiler renting, often regarded as a boiler subscription service, has emerged as a vital al...

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What Happens After Your Boiler is Installed By iHeat?

10th October, 2025 Advice

What Happens After Your Boiler...

In this guide, we’ll be answering some of the most frequently asked questions about what h...

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Vokera Boilers Prices 2025

10th October, 2025 Reviews

Vokera Boilers Prices 2025

Vokera is an established and innovative brand, providing highly efficient home heating, wh...

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Viessmann Combi Boiler Costs

10th October, 2025 Guides

Viessmann Combi Boiler Costs

Viessmann combi boilers are renowned for their efficiency and technological advancement.

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Vaillant Combi Boiler Costs

10th October, 2025 Guides

Vaillant Combi Boiler Costs

As Vaillant continues to innovate, integrating smart technology and improving energy perfo...

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Vaillant Boiler Prices

10th October, 2025 Guides

Vaillant Boiler Prices

As an online boiler installation company, iHeat provides an in-depth look at Vaillant boil...

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How To Choose The Right Boiler For Your Home

10th October, 2025 Guides

How To Choose The Right Boiler...

Choosing the right boiler for your home can be a stressful and overwhelming experience, bu...

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