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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

Navien Boiler Error Codes

20th May, 2026 Guides

Navien Boiler Error Codes

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

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Is It Safe to Turn Off a Combi Boiler?

20th May, 2026 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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Is it Cheaper to Replace Your Boiler in Summer?

20th May, 2026 Guides

Is it Cheaper to Replace Your...

You may be wondering when the best time to replace your old, inefficient boiler is, and wh...

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Is a Heat Pump Cheaper to Run Than a Boiler?

20th May, 2026 Comparisons

Is a Heat Pump Cheaper to Run...

In this UK heat pump vs new gas boiler comparison guide, we'll be taking a look at which t...

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How to Increase Pressure on Worcester Bosch Boiler Without Key

20th May, 2026 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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How to Improve Radiator Efficiency & Performance

20th May, 2026 Guides

How to Improve Radiator Effici...

Radiator efficiency plays a key role in maintaining a comfortable and cost-effective home....

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Ignition Lockout on Boiler

20th May, 2026 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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Ideal Room Temperature

20th May, 2026 Guides

Ideal Room Temperature

Comfort in living spaces is crucial for wellbeing. The ideal room temperature can vary bas...

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Ideal Logic+ Combi Review

20th May, 2026 Reviews

Ideal Logic+ Combi Review

In this guide, we will be reviewing the Ideal Logic+ combi boiler, taking a look at its fe...

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Ideal Boilers - Vogue Range

20th May, 2026 Guides

Ideal Boilers - Vogue Range

The Ideal Boilers' Vogue Range stands out as a premium selection, consistent with the comp...

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Ideal Boiler Status C

20th May, 2026 Guides

Ideal Boiler Status C

The "Status C" on an Ideal boiler's display simply indicates that the boiler is operating...

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Ideal Boiler Status 00 - How to Fix

20th May, 2026 Guides

Ideal Boiler Status 00 - How t...

Ideal boilers provide a variety of fault codes to help diagnose issues. Understanding thes...

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