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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

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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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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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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Can You Pair Radiators With Heat Pumps?

30th May, 2025 Guides

Can You Pair Radiators With He...

Choosing the right radiator for a heat pump is crucial. The performance can vary depending...

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Are Heat Pumps Noisy?

30th May, 2025 Guides

Are Heat Pumps Noisy?

Heat pumps have become a popular choice for energy-efficient heating and cooling. A common...

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Air Source Heat Pump Service

30th May, 2025 Guides

Air Source Heat Pump Service

An air source heat pump should generally be serviced once a year. Regular servicing ensure...

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How to Properly Ventilate a Boiler Room for Safety

30th May, 2025 Guides

How to Properly Ventilate a Bo...

Proper ventilation in a boiler room is essential for safety and efficiency. Without adequa...

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Boiler Electrodes

30th May, 2025 Guides

Boiler Electrodes

Boiler electrodes are key components in gas, combi, and electric boilers. They serve cruci...

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RCD - Residual Current Device Guide

30th May, 2025 Guides

RCD - Residual Current Device...

An RCD, or Residual Current Device, is an electrical safety mechanism that detects when el...

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Is It Safe to Turn Off a Combi Boiler?

30th May, 2025 Guides

Is It Safe to Turn Off a Combi...

Turning off a combi boiler can be safe, but certain factors should be considered.

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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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