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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

Potterton Boiler (Combi Range)

30th May, 2025 Guides

Potterton Boiler (Combi Range)

Potterton are a brand with a celebrated lineage of expertise when it comes to heating, Pot...

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Heat Pumps: The Ultimate UK guide

30th May, 2025 Guides

Heat Pumps: The Ultimate UK gu...

As energy efficiency and environmental concerns continue to shape our choices, heat pumps...

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How to Work a Thermostat

30th May, 2025 Guides

How to Work a Thermostat

A thermostat when used effectively can be a vital part of central heating control for your...

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The Benefits of Using a Hive Thermostat for Your Smart Home

30th May, 2025 Guides

The Benefits of Using a Hive T...

If you're looking to upgrade your home to a smart home, one of the best investments you ca...

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Are Boiler Hot Water Storage Tanks a Necessity?

30th May, 2025 Guides

Are Boiler Hot Water Storage T...

You may be wondering, are hot water storage tanks essential to home heating and the runnin...

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What is the Cheapest Way to Heat a House?

30th May, 2025 Guides

What is the Cheapest Way to He...

Heating your home should not be a decision ruled by fear of overspending on your bills, es...

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Vaillant Combi Boilers

30th May, 2025 Guides

Vaillant Combi Boilers

At iHeat We’ve joined forces with Vaillant UK to become the first online company to instal...

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Vaillant F24 Error Code - How To Fix

30th May, 2025 Guides

Vaillant F24 Error Code - How...

Any time a boiler error code presents itself it can be anxiety and stress inducing, but fe...

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Vaillant EcoTEC Plus

30th May, 2025 Reviews

Vaillant EcoTEC Plus

Vaillant UK manufactures some of the finest boilers on the market, highly efficient and ec...

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Vaillant ecoFIT Pure Review

30th May, 2025 Reviews

Vaillant ecoFIT Pure Review

At iHeat we stock only the best boilers to efficiently heat your home, and save you money....

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E1 Error Code - How To Fix

30th May, 2025 Guides

E1 Error Code - How To Fix

When a boiler starts displaying an error code out of the blue it can be a shock to the sys...

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Leaking Overflow Pipe - Causes and Fixes

30th May, 2025 Advice

Leaking Overflow Pipe - Causes...

Any time a boiler or pipework is leaking, it’s a bad sign, and an overflow pipe is no diff...

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