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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

Vokera Boiler Flashing Green Light - How to Fix

05th February, 2026 Guides

Vokera Boiler Flashing Green L...

The green light is part of the boiler's diagnostic system; a flashing signal often points...

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Different Types Of Radiator Bleed Valves/Knobs Explained

05th February, 2026 Guides

Different Types Of Radiator Bl...

Radiator dials, often referred to as bleed valves or knobs, are crucial for managing the p...

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Ideal Boiler Status C

05th February, 2026 Guides

Ideal Boiler Status C

The "Status C" on an Ideal boiler's display simply indicates that the boiler is operating...

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Ideal Boiler Status 00 - How to Fix

05th February, 2026 Guides

Ideal Boiler Status 00 - How t...

Ideal boilers provide a variety of fault codes to help diagnose issues. Understanding thes...

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Boiler Control Panel

05th February, 2026 Guides

Boiler Control Panel

A boiler control panel is the interface that allows users to interact with their heating s...

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How to Adjust Water Temperature on Boiler

05th February, 2026 Guides

How to Adjust Water Temperatur...

Boiler systems can vary, each with specific components and controls that affect how they o...

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Hot Water Tank Thermostat

05th February, 2026 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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How Often Should a Boiler Be Replaced?

05th February, 2026 Guides

How Often Should a Boiler Be R...

It's critical for homeowners to understand the lifespan of their boiler to maintain an eff...

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Hot Water Storage Cylinders/Tanks for Boilers

05th February, 2026 Guides

Hot Water Storage Cylinders/Ta...

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

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Boiler Manifold - Role, Function, and Cost Guide

05th February, 2026 Guides

Boiler Manifold - Role, Functi...

A boiler manifold is a vital component in many heating systems. It acts as the central hub...

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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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