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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

How to Set Digital Timer on Boiler

20th May, 2026 Guides

How to Set Digital Timer on Bo...

A digital timer on a boiler is a control device that allows users to set specific times fo...

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How to Reset Vaillant Boiler

20th May, 2026 Guides

How to Reset Vaillant Boiler

The reset button on a Vaillant boiler typically has a small flame icon and can be found on...

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How To Improve EPC Rating

20th May, 2026 Guides

How To Improve EPC Rating

An Energy Performance Certificate (EPC) rates how energy efficient a property is. The rati...

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How to Connect Wireless Thermostat to Boiler

20th May, 2026 Guides

How to Connect Wireless Thermo...

Connecting a wireless thermostat to a boiler can help improve heating efficiency and contr...

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How to Adjust Water Temperature on Boiler

20th May, 2026 Guides

How to Adjust Water Temperatur...

Boiler systems can vary, each with specific components and controls that affect how they o...

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How Often Should a Boiler Be Replaced?

20th May, 2026 Guides

How Often Should a Boiler Be R...

It's critical for homeowners to understand the lifespan of their boiler to maintain an eff...

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How much cheaper is a new boiler to run?

20th May, 2026 Guides

How much cheaper is a new boil...

New boilers are in fact much cheaper to run than old boilers, this is down to a number of...

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How Much Money Can a New Boiler Save Me?

20th May, 2026 Guides

How Much Money Can a New Boile...

Installing a new boiler can help you save money on your energy bills while improving the e...

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How many hours should heating be on in the UK?

20th May, 2026 Guides

How many hours should heating...

Summary sentence for the blog: Learn the optimal duration for heating usage in the UK with...

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How Long Will A Back Boiler Conversion Take?

20th May, 2026 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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How Long Does a Boiler Service Take?

20th May, 2026 Advice

How Long Does a Boiler Service...

A boiler service is an important part of boiler maintenance, helping to ensure that your h...

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How Efficient Is My Boiler?

20th May, 2026 Guides

How Efficient Is My Boiler?

Boiler energy efficiency refers to how well a boiler uses its fuel to generate heat. This...

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