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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

Glow Worm F1 Fault

25th July, 2025 Guides

Glow Worm F1 Fault

Boiler error codes are critical indicators for diagnosing heating system issues. They serv...

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Oil Boiler Not Firing Up - Common Causes and fixes

09th July, 2025 Guides

Oil Boiler Not Firing Up - Com...

An oil boiler often refuses to start due to common issues like empty oil tanks, power supp...

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Ignition Lockout on Boiler

18th June, 2025 Guides

Ignition Lockout on Boiler

A boiler lockout occurs when a boiler detects a fault and shuts down to prevent further is...

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Oil Boiler Ban

18th June, 2025 Guides

Oil Boiler Ban

As preparation steps up for the transition from oil boilers, homeowners confront a multifa...

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Why Is My Radiator Cold At The Bottom?

12th June, 2025 Advice

Why Is My Radiator Cold At The...

If you find your radiator cold at the bottom, it could mean that there is an issue with yo...

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How Much Does a Heat Pump Cost? A 2025 Guide

11th June, 2025 Guides

How Much Does a Heat Pump Cost...

Explore the different types, costs, and efficiency of heat pumps in this blog post, illumi...

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How to Power Your Boiler with Solar Panels

10th June, 2025 Advice

How to Power Your Boiler with...

As more and more people become conscious of their impact on the environment and the ban on...

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How to Increase Pressure on Worcester Bosch Boiler Without Key

09th June, 2025 Guides

How to Increase Pressure on Wo...

A Worcester Bosch boiler is a complex machine with many components working together to hea...

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No Water Coming Out Of Hot Tap (Combi Boiler)

05th June, 2025 Guides

No Water Coming Out Of Hot Tap...

Addressing the lack of hot water from a tap usually starts with understanding how a combi...

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What Should Boiler Pressure Be When Heating is Off?

05th June, 2025 Guides

What Should Boiler Pressure Be...

The efficiency and safety of a home's heating system hinge on maintaining the correct boil...

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Boiler Flue Regulations

04th June, 2025 Guides

Boiler Flue Regulations

A boiler flue is a critical component that helps expel harmful gases from your home, ensur...

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What to do with Your Boiler when You Go on Holiday

02nd June, 2025 Advice

What to do with Your Boiler wh...

The last thing you want to be thinking about while you're enjoying your summer holidays, o...

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