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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

Vaillant F62 Fault Code

25th July, 2025 Guides

Vaillant F62 Fault Code

Error codes on boilers can be a confusing and frustrating topic, here at iHeat we want to...

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Ideal F3 Error Code - How To Fix

25th July, 2025 Guides

Ideal F3 Error Code - How To F...

The Ideal F3 error code is a common issue that can cause your boiler to shut down unexpect...

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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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Worcester Bosch Climate 3000i Air Con Review

17th July, 2025 Reviews

Worcester Bosch Climate 3000i...

After an in-depth look at the Worcester Bosch Climate 3000i air conditioning system, we've...

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Can I Have Air Conditioning and a Gas Boiler?

17th July, 2025 Guides

Can I Have Air Conditioning an...

Achieve year-round comfort in your boiler-heated home by integrating efficient air conditi...

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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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