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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

AI Technology in Home Heating: The Future of Efficiency?

30th May, 2025 Guides

AI Technology in Home Heating:...

Artificial Intelligence (AI) is changing home heating by introducing smarter, more efficie...

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What is Boiler Dry Cycling?

30th May, 2025 Guides

What is Boiler Dry Cycling?

Boiler dry cycling occurs when a boiler frequently turns on and off without a demand for h...

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Can Your Boiler Work Without Gas? Backup Heating Options for Your Home

30th May, 2025 Guides

Can Your Boiler Work Without G...

Standard boilers typically rely on gas as their primary fuel source. For homes without acc...

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Y Plan Wiring Diagram

30th May, 2025 Guides

Y Plan Wiring Diagram

A Y Plan heating system is a design used in some homes to manage both central heating and...

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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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Ideal Boiler Status P How to Fix

30th May, 2025 Guides

Ideal Boiler Status P How to F...

Understanding the reasons behind the Status P error is essential for fixing it promptly. T...

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How To Improve EPC Rating

30th May, 2025 Guides

How To Improve EPC Rating

An Energy Performance Certificate (EPC) rates how energy efficient a property is. The rati...

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How to Adjust Water Temperature on Boiler

30th May, 2025 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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How to Set Digital Timer on Boiler

30th May, 2025 Guides

How to Set Digital Timer on Bo...

A digital timer on a boiler is a control device that allows users to set specific times fo...

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How Efficient Is My Boiler?

30th May, 2025 Guides

How Efficient Is My Boiler?

Boiler energy efficiency refers to how well a boiler uses its fuel to generate heat. This...

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Who Qualifies for a Boiler Grant in 2025?

30th May, 2025 Guides

Who Qualifies for a Boiler Gra...

Boiler grants in the UK assist homeowners in upgrading heating systems to more efficient m...

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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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