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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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 Causes Boiler Corrosion and How to Prevent It?

30th May, 2025 Guides

What Causes Boiler Corrosion a...

Boiler corrosion happens when metal parts in boilers break down due to chemical reactions....

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Boiler Overheating

30th May, 2025 Guides

Boiler Overheating

When a boiler overheats, it can cause significant issues. Components inside can get damage...

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The Benefits of Zoned Heating for Energy Savings

30th May, 2025 Guides

The Benefits of Zoned Heating...

Zoned heating is a way to improve efficiency in heating and cooling systems. It divides a...

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How To Free A Stuck Diverter Valve In Your Boiler - An Expert Guide

30th May, 2025 Guides

How To Free A Stuck Diverter V...

A diverter valve is an essential component of a combi boiler. Its main job is to control t...

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Ariston Boiler Error Codes

30th May, 2025 Guides

Ariston Boiler Error Codes

Common issues include low water pressure or failure to ignite, indicated by specific error...

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Does Turning Down Radiators Save Gas & Money?

30th May, 2025 Guides

Does Turning Down Radiators Sa...

While it seems logical that using less heating could save money, the effectiveness of this...

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Hot Water Storage Cylinders/Tanks for Boilers

30th May, 2025 Guides

Hot Water Storage Cylinders/Ta...

Choosing the right hot water tank requires understanding your home’s specific requirements...

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What Temperature For A Thermostat In Winter?

30th May, 2025 Guides

What Temperature For A Thermos...

Thermostats are devices used to control the heating or cooling of a home. They function by...

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ESI Thermostat Troubleshooting UK

30th May, 2025 Guides

ESI Thermostat Troubleshooting...

ESI thermostats are designed to help maintain a comfortable temperature in homes and offic...

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One Radiator Not Working In One Room

30th May, 2025 Guides

One Radiator Not Working In On...

A radiator not heating up properly can be frustrating. There are several reasons this migh...

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How Much Energy/Electricity Do My Appliances Use? Expert advice

30th May, 2025 Guides

How Much Energy/Electricity Do...

Different appliances in your home use various amounts of electricity. Understanding this c...

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Boiler in Bathroom

30th May, 2025 Guides

Boiler in Bathroom

Installing a boiler in a bathroom can be safe and legal in the UK, but specific regulation...

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