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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

Most Efficient Combi Boiler to Save Money

02nd February, 2026 Guides

Most Efficient Combi Boiler to...

Combi boilers are celebrated for their energy efficiency and compact size, a departure fro...

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Boiler Warranties & Guarantees: Top UK Brands for Best Value

02nd February, 2026 Guides

Boiler Warranties & Guarantees...

Boiler warranties and guarantees are essential aspects to consider when investing in a new...

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New Central Heating System Costs - (Need To Upgrade?)

02nd February, 2026 Guides

New Central Heating System Cos...

By upgrading your old, inefficient heating system you can improve your home’s temperature...

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Is it Cheaper to Replace Your Boiler in Summer?

02nd February, 2026 Guides

Is it Cheaper to Replace Your...

You may be wondering when the best time to replace your old, inefficient boiler is, and wh...

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How much cheaper is a new boiler to run?

02nd February, 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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Why is My Radiator So Noisy?

02nd February, 2026 Guides

Why is My Radiator So Noisy?

Radiators can emit a variety of sounds, each indicating a different potential issue within...

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Baxi Boiler E133 Error Code

02nd February, 2026 Guides

Baxi Boiler E133 Error Code

Understanding boiler error codes is essential in determining the proper course of action....

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Boiler Installation Edinburgh

02nd February, 2026 Guides

Boiler Installation Edinburgh

When installing a new boiler, homeowners must consider the type, the brands available, and...

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Vaillant Comfort Mode (and Flashing C on a Vaillant Boiler)

02nd February, 2026 Guides

Vaillant Comfort Mode (and Fla...

Vaillant Comfort Mode is a feature available on Vaillant boilers designed to provide a con...

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Ignition Lockout on Boiler

02nd February, 2026 Guides

Ignition Lockout on Boiler

A boiler lockout occurs when a boiler detects a fault and shuts down to prevent further is...

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Ideal Boiler Status P How to Fix

02nd February, 2026 Guides

Ideal Boiler Status P How to F...

Understanding the reasons behind the Status P error is essential for fixing it promptly. T...

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How to Reset Ideal Logic Combi 30 Boiler

02nd February, 2026 Guides

How to Reset Ideal Logic Combi...

Resetting an Ideal Logic Combi 30 boiler might be needed for a few reasons. Often, it is d...

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