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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

Combi Boilers - Advantages And Disadvantages

05th February, 2026 Comparisons

Combi Boilers - Advantages And...

Combi boilers are by far the most popular type of home heating system in the UK, and with...

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How to Reset Vaillant Boiler

05th February, 2026 Guides

How to Reset Vaillant Boiler

The reset button on a Vaillant boiler typically has a small flame icon and can be found on...

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Where is the Boiler Fuse Located?

05th February, 2026 Guides

Where is the Boiler Fuse Locat...

A boiler fuse is a small yet crucial electrical component found within a boiler system. It...

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Top 5 Reasons Your Thermostat Isn’t Working Properly

05th February, 2026 Guides

Top 5 Reasons Your Thermostat...

Regular maintenance and checks of both the thermostat and the heating and cooling system c...

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Boiler Repair Bolton

05th February, 2026 Guides

Boiler Repair Bolton

In Bolton, boiler repair costs and procedures vary significantly depending on the type of...

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Worcester Bosch Boiler Pressure - UK Mega Guide

05th February, 2026 Guides

Worcester Bosch Boiler Pressur...

Maintaining the correct boiler pressure is essential for the efficiency and longevity of W...

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The Benefits of Zoned Heating for Energy Savings

05th February, 2026 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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Reducing heat loss from your home

05th February, 2026 Guides

Reducing heat loss from your h...

Heat loss in a home happens when warm air escapes to the outside, and cold air infiltrates...

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Navien Combi Boiler Costs

05th February, 2026 Guides

Navien Combi Boiler Costs

Navien combi boilers have secured a competitive edge by providing both central heating and...

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Navien Boiler Reviews

05th February, 2026 Reviews

Navien Boiler Reviews

Navien, a revered boiler manufacturer, has established a reputation for innovation and rel...

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OpenTherm

05th February, 2026 Guides

OpenTherm

OpenTherm began with the objective of streamlining communications between heating system c...

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Types Of Boiler

05th February, 2026 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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