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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

Why is My Air Conditioner Blowing Warm Air Instead of Cool?

29th May, 2026 Advice

Why is My Air Conditioner Blow...

If an air conditioner is blowing warm air instead of cool air, it is often caused by dirty...

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Why Is My Air Conditioner Making Noise?

29th May, 2026 Guides

Why Is My Air Conditioner Maki...

Air conditioners naturally make some noise while running, but unusual sounds such as rattl...

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Why Your AC is Freezing Up & What to Do

29th May, 2026 Advice

Why Your AC is Freezing Up & W...

If your air conditioner is freezing up, it is usually caused by restricted airflow, dirty...

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How do I know if my air conditioning system needs regassing?

29th May, 2026 Guides

How do I know if my air condit...

If your air conditioning system is no longer cooling rooms properly, takes much longer to...

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Can You Leave Air Conditioning On Overnight?

29th May, 2026 Advice

Can You Leave Air Conditioning...

Yes, in most homes it is completely safe to leave air conditioning on overnight, particula...

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Air Conditioning vs Dehumidifier for Condensation

29th May, 2026 Comparisons

Air Conditioning vs Dehumidifi...

If you're dealing with condensation on windows, damp rooms, or excess moisture indoors, yo...

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When is the Best Time to Have Air Conditioning Installed?

29th May, 2026 Advice

When is the Best Time to Have...

Many UK homeowners only start thinking about air conditioning once a room becomes uncomfor...

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How to Cool Multiple Rooms With One AC Unit

29th May, 2026 Guides

How to Cool Multiple Rooms Wit...

Many UK homeowners wonder whether one air conditioning unit can cool multiple rooms, parti...

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Do Air Conditioning Units Qualify for 0% VAT in the UK?

29th May, 2026 Guides

Do Air Conditioning Units Qual...

Many UK homeowners are surprised to learn that air conditioning systems do not automatical...

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Air Conditioning for Conservatories: The UK Guide

29th May, 2026 Guides

Air Conditioning for Conservat...

Conservatories can become unbearably hot during warmer weather, which is why many UK homeo...

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Will My Boiler Work If the Water Is Off?

29th May, 2026 Guides

Will My Boiler Work If the Wat...

Turning off the water supply might cause concern about the boiler, but most boilers are bu...

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Ariston Boiler Error Codes

29th May, 2026 Guides

Ariston Boiler Error Codes

Common issues include low water pressure or failure to ignite, indicated by specific error...

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