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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

Worcester Bosch A21 Error Code - How To Fix

15th October, 2025 Guides

Worcester Bosch A21 Error Code...

If Your Worcester Bosch boiler is displaying an A21 error code it can be a vexing issue, e...

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Common Worcester Bosch Boiler Error Codes

15th October, 2025 Guides

Common Worcester Bosch Boiler...

In this guide, we are going to highlight the most common Worcester BOSCH errors that can s...

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How to Drain a Combi Boiler

14th October, 2025 Advice

How to Drain a Combi Boiler

There are a few reasons why you might want to drain your combi boiler. For example, perhap...

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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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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 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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Combi Boiler Replacement Cost

10th October, 2025 Guides

Combi Boiler Replacement Cost

Replacing your boiler can be a stressful and costly process. That’s why we have written th...

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When Should You Replace Your Boiler?

10th October, 2025 Guides

When Should You Replace Your B...

It can cost a lot to get the right boiler installed into your home, which is why a lot of...

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Should You Buy A New Gas Boiler?

10th October, 2025 Advice

Should You Buy A New Gas Boile...

Are the different types of boilers confusing you? Let us explain exactly what gas boiler i...

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How Long Will A Back Boiler Conversion Take?

09th October, 2025 Advice

How Long Will A Back Boiler Co...

A back boiler conversion could be your ticket from the past to the present, where boilers...

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What is the Fastest Way to Get a New Boiler?

09th October, 2025 Guides

What is the Fastest Way to Get...

The fastest way to get a new boiler is to work with iHeat, a company that offers fast inst...

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

09th October, 2025 Guides

Are You About to Spend Too Muc...

According to a 2017 study by uSwitch, 18% of UK households had experienced a boiler breakd...

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