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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

How Often Should Air Conditioner Filters Be Cleaned?

22nd May, 2026 Advice

How Often Should Air Condition...

Air conditioner filters should usually be cleaned every two to four weeks during periods o...

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Types Of Air Conditioning - Options For UK Homes

22nd May, 2026 Advice

Types Of Air Conditioning - Op...

This guide helps you choose the best type of air conditioning for your UK home.

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What Size Air Conditioner Do I Need in the UK?

22nd May, 2026 Advice

What Size Air Conditioner Do I...

Room size matters, but heat, glazing, and usage matter too.

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Portable Vs Wall-Mounted Air Conditioning: Which Is Better?

22nd May, 2026 Comparisons

Portable Vs Wall-Mounted Air C...

Portable and wall mounted air conditioning both have their own strengths and drawbacks dep...

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Do You Need Planning Permission for Air Conditioning UK?

22nd May, 2026 Guides

Do You Need Planning Permissio...

Most UK homeowners don’t need planning permission for air conditioning if it meets permitt...

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Air Conditioning Unit - Common Errors and Fixes

22nd May, 2026 Guides

Air Conditioning Unit - Common...

Air conditioning systems are vital for maintaining a comfortable indoor environment, espec...

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Air Conditioning Running Costs UK 2026

22nd May, 2026 Guides

Air Conditioning Running Costs...

Air conditioning running costs depend on how much electricity the unit uses, how long you...

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Most Energy-Efficient Air Conditioning Units in the UK (SEER & Running Cost Comparison)

22nd May, 2026 Comparisons

Most Energy-Efficient Air Cond...

The most energy-efficient air conditioning units in the UK are usually high-SEER wall-moun...

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Best Bedroom Air Conditioning Units

22nd May, 2026 Guides

Best Bedroom Air Conditioning...

When outfitting a bedroom with an air conditioner, it's crucial to understand the types av...

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Air conditioning replacement: when to repair and when to replace

22nd May, 2026 Advice

Air conditioning replacement:...

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

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Why Is My Air Conditioner Leaking Water?

22nd May, 2026 Guides

Why Is My Air Conditioner Leak...

An air conditioner usually leaks water because the condensate drain is blocked, the filter...

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Air Conditioning Installation Process: What to Expect

22nd May, 2026 Guides

Air Conditioning Installation...

Most UK air conditioning installations are completed within one to two days, although setu...

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