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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

Best Regular (Heat-Only) Boilers in 2025

11th August, 2025 Guides

Best Regular (Heat-Only) Boile...

Here at iHeat we’re experts in anything boilers, and understand at times the central heati...

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Most Efficient Combi Boiler to Save Money

11th August, 2025 Guides

Most Efficient Combi Boiler to...

Combi boilers are celebrated for their energy efficiency and compact size, a departure fro...

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Best System Boilers for 2025

11th August, 2025 Guides

Best System Boilers for 2025

Are you looking at having a new system boiler installed in your home but aren’t sure which...

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Navien Boiler Error Codes

11th August, 2025 Guides

Navien Boiler Error Codes

Troubleshoot common Navien boiler error codes with iHeat, a leading UK provider of heating...

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Oil Fired Boiler

11th August, 2025 Guides

Oil Fired Boiler

An oil fired boiler is a heating system that uses oil as its fuel to heat water for centra...

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Ravenheat Boiler - Combi Prices 2025

11th August, 2025 Guides

Ravenheat Boiler - Combi Price...

Ravenheat combi boilers are known for their affordability and efficiency. They include mod...

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New Gas Boiler Technology & Features

11th August, 2025 Guides

New Gas Boiler Technology & Fe...

Modern gas boilers can offer significant advantages over older, less efficient models, fro...

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Boiler Control Panel

11th August, 2025 Guides

Boiler Control Panel

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

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Worcester Bosch Combi Boiler Hot Water Goes Cold

11th August, 2025 Guides

Worcester Bosch Combi Boiler H...

Ensuring consistent hot water supply in your Worcester Bosch combi boiler often necessitat...

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Boiler Timer Guide

11th August, 2025 Guides

Boiler Timer Guide

A boiler timer is an essential component of your heating system, allowing you to control w...

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Heat Pump Pros and Cons - A Complete Guide for UK 2025

11th August, 2025 Comparisons

Heat Pump Pros and Cons - A Co...

As one of the hottest topics in the industry, heat pumps are being contemplated by homeown...

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Moving Boiler To The Attic Or Garage

11th August, 2025 Advice

Moving Boiler To The Attic Or...

If you believe you would benefit from moving your boiler to a new location, either for fin...

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