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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

Central Heating Boilers

30th May, 2025 Guides

Central Heating Boilers

How do you decide which boiler is actually right for your central heating needs?

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Heat Only Boilers

30th May, 2025 Guides

Heat Only Boilers

Buying a new boiler can be a stressful process. There are a lot of different systems to co...

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How to Fix a Faulty Heat Exchanger

30th May, 2025 Advice

How to Fix a Faulty Heat Excha...

In this guide, we’re going to be explaining what a heat exchanger is, some common causes f...

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Types Of Boiler

30th May, 2025 Guides

Types Of Boiler

The type of boiler that you choose can have some major impacts on your heating and hot wat...

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Viessmann Vitodens - A Guide to the Range

30th May, 2025 Reviews

Viessmann Vitodens - A Guide t...

Viessmann is one of the best and most reliable boiler brands on the market with their adva...

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Ideal Temperature at Home

30th May, 2025 Advice

Ideal Temperature at Home

Finding and maintaining the right temperature in your home can feel like a constant battle...

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Diverter Valve

30th May, 2025 Advice

Diverter Valve

One of the most common reasons for heating and hot water to stop working properly is a fau...

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Boiler Inactive Over Summer? How to Avoid Needing Repairs

30th May, 2025 Advice

Boiler Inactive Over Summer? H...

Over the summer months, many of us tend to use our central heating much less and sometimes...

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Hot Water Tank Thermostat

30th May, 2025 Guides

Hot Water Tank Thermostat

For most UK homes, setting the hot water tank thermostat between 60°C and 65°C provides a...

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Wall-mounted or floor-standing boiler?

30th May, 2025 Comparisons

Wall-mounted or floor-standing...

Choosing between a wall-mounted and a floor-standing boiler mostly depends on the type of...

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What is a Gas Supply Pipe?

30th May, 2025 Guides

What is a Gas Supply Pipe?

A gas supply pipe is an essential part of any property with a gas boiler. Its main job is...

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Electric Boiler Service

30th May, 2025 Guides

Electric Boiler Service

Electric boilers are popular in many UK homes due to their efficiency and compatibility wi...

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