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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 Old is My Boiler and When to Consider a Replacement?

06th February, 2026 Guides

How Old is My Boiler and When...

A modern, efficient boiler can operate at over 90% efficiency, leading to significant savi...

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Why Putting a Boiler Outside Is Often a Bad Idea

06th February, 2026 Guides

Why Putting a Boiler Outside I...

While putting a boiler outside may seem like a good idea to save space and reduce noise in...

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

06th 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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Can I Get Help With A New Boiler If I Am Not On Benefits

06th February, 2026 Guides

Can I Get Help With A New Boil...

A free boiler grant is part of a UK government scheme aimed at making homes more energy ef...

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Why Is Boiler Water Treatment Important?

06th February, 2026 Guides

Why Is Boiler Water Treatment...

In boiler systems, water treatment involves several techniques. These methods remove impur...

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What is Boiler Frost Protection?

06th February, 2026 Guides

What is Boiler Frost Protectio...

Boiler frost protection is an important feature that helps prevent your boiler from freezi...

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Vaillant F72 Error Code - How To Fix

06th February, 2026 Guides

Vaillant F72 Error Code - How...

If you're experiencing the Vaillant F72 error code on your boiler, our guide can help. We...

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How to increase boiler efficiency

06th February, 2026 Guides

How to increase boiler efficie...

Want to maximise your boiler efficiency in cold weather? Our guide provides tips on how to...

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Ideal F2 Error Code - How to Fix

06th February, 2026 Guides

Ideal F2 Error Code - How to F...

If you're experiencing the Ideal F2 error code on your boiler, our guide can help. We expl...

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How to Fix Boiler Airlock: Expert Guide

06th February, 2026 Guides

How to Fix Boiler Airlock: Exp...

If you're struggling with a boiler airlock, our comprehensive guide can help. We explain t...

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Disadvantages of Oil Boilers: Exploring Key Concerns

06th February, 2026 Guides

Disadvantages of Oil Boilers:...

Oil boilers may be a popular choice for home heating, but they come with some significant...

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Best Boiler for Terraced House

06th February, 2026 Guides

Best Boiler for Terraced House

Searching for the best boiler brand for terraced housing? Our guide compares the top-rated...

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