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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

Daikin Sensira Air Conditioning Unit Review

02nd April, 2026 Reviews

Daikin Sensira Air Conditionin...

The Daikin Sensira air conditioning unit boasts a blend of compact design with top-notch f...

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Best Air Conditioning Brands

02nd April, 2026 Advice

Best Air Conditioning Brands

Find the best air conditioning brands in the UK for 2026, with a focus on performance, eff...

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Back Boiler Replacement Cost in the UK

02nd April, 2026 Guides

Back Boiler Replacement Cost i...

Back boilers are outdated, inefficient, and pose safety risks. Upgrading to a combi boiler...

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Boiler Pressure Too High: What It Means and How to Fix It

02nd April, 2026 Advice

Boiler Pressure Too High: What...

High boiler pressure is usually anything above 2.5 bar on the pressure gauge when the heat...

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What is an air conditioning condenser unit?

02nd April, 2026 Guides

What is an air conditioning co...

An air conditioning condenser unit is the outdoor part of your system that releases heat f...

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Worcester Bosch Climate 3200i - Review

02nd April, 2026 Reviews

Worcester Bosch Climate 3200i...

The Worcester Bosch Climate 3200i is a modern air conditioning unit designed for UK homes....

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Best Air Conditioning Units UK

01st April, 2026 Guides

Best Air Conditioning Units UK

Air conditioning helps keep homes cool during heatwaves. This is especially important for...

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Air conditioning replacement: when to repair and when to replace

27th March, 2026 Advice

Air conditioning replacement:...

If your air conditioning is unreliable or costly to run, replacement may make more sense.

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How Much Does a Heat Pump Cost? 2026 Guide

27th March, 2026 Guides

How Much Does a Heat Pump Cost...

In the UK, a heat pump usually costs several thousand pounds, with most air source systems...

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Ideal F2 Error Code - How to Fix

27th March, 2026 Guides

Ideal F2 Error Code - How to F...

Ideal F2 usually means flame loss.

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Worcester Boiler Fault 227

27th March, 2026 Guides

Worcester Boiler Fault 227

Boiler systems utilise error codes as an internal diagnostic tool. They offer a swift indi...

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Best Wall Mounted Air Conditioning

26th March, 2026 Guides

Best Wall Mounted Air Conditio...

The best wall mounted air conditioning unit depends on your room, budget and year-round ne...

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