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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

Boxing In A Boiler: How to Hide a Boiler in Kitchen

04th February, 2026 Guides

Boxing In A Boiler: How to Hid...

Hiding a boiler in the kitchen can enhance the room's aesthetic while maintaining function...

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Hive vs Nest - Best Smart Thermostat

04th February, 2026 Reviews

Hive vs Nest - Best Smart Ther...

When choosing a smart thermostat, the Nest and Hive are top contenders. Each offers key fe...

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Why is My Radiator So Noisy?

04th February, 2026 Guides

Why is My Radiator So Noisy?

Radiators can emit a variety of sounds, each indicating a different potential issue within...

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F54 Vaillant Boiler Fault Code

04th February, 2026 Guides

F54 Vaillant Boiler Fault Code

Boiler error codes are numeric or alphanumeric messages displayed on the boiler's interfac...

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E1 Error Code - How To Fix

04th February, 2026 Guides

E1 Error Code - How To Fix

When a boiler starts displaying an error code out of the blue it can be a shock to the sys...

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Boiler Short Cycling - Fixes

04th February, 2026 Guides

Boiler Short Cycling - Fixes

Our Boiler Short Cycling Fixes blog offers expert solutions and practical advice to addres...

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Boiler Hacks: Boost Performance & Savings

04th February, 2026 Guides

Boiler Hacks: Boost Performanc...

Boiler hacks are simple tricks and tips that can help you save money on your heating bills...

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Alpha E-Tec Boilers | A Guide to the Range

04th February, 2026 Reviews

Alpha E-Tec Boilers | A Guide...

Founded in 1966, Alpha Heating Innovation is recognised as one of the leaders of the UK’s...

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How to Soundproof a Boiler Cupboard

04th February, 2026 Guides

How to Soundproof a Boiler Cup...

From adding insulation to sealing gaps, there are both DIY and professional methods availa...

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The Best LPG Combi Boilers 2026

04th February, 2026 Guides

The Best LPG Combi Boilers 202...

You may have heard of LPG boilers before, but even if you are not familiar with them, they...

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What is Boiler Dry Cycling?

03rd February, 2026 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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Vaillant F61 Error Code - How To Fix

03rd February, 2026 Guides

Vaillant F61 Error Code - How...

One of the most common Vaillant boiler error codes is the F61 error code. This error code...

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