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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

What Should Boiler Pressure Be When Heating is Off?

06th February, 2026 Guides

What Should Boiler Pressure Be...

The efficiency and safety of a home's heating system hinge on maintaining the correct boil...

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Glow Worm Combi Boiler Costs

06th February, 2026 Guides

Glow Worm Combi Boiler Costs

A combi boiler, or combination boiler, is a high-efficiency water heater and a central hea...

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Oil Fired Boiler

06th February, 2026 Guides

Oil Fired Boiler

An oil fired boiler is a heating system that uses oil as its fuel to heat water for centra...

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Do Heat Pumps Work in Cold Weather?

06th February, 2026 Guides

Do Heat Pumps Work in Cold Wea...

As homeowners seek sustainable and cost-effective heating solutions, understanding the mec...

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Can Your Boiler Work Without Gas? Backup Heating Options for Your Home

06th February, 2026 Guides

Can Your Boiler Work Without G...

Standard boilers typically rely on gas as their primary fuel source. For homes without acc...

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What is an Immersion Heater and What Does it Cost?

06th February, 2026 Advice

What is an Immersion Heater an...

Everything UK homeowners need to know about immersion heaters and running costs.

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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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