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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

Thermostats for Heat Pumps Mega Guide

20th May, 2026 Guides

Thermostats for Heat Pumps Meg...

Heat pump thermostats play a crucial role in managing the temperature in homes. A heat pum...

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Replace Boiler With Heat Pump - Benefits, Costs & Guide (2026)

20th May, 2026 Guides

Replace Boiler With Heat Pump...

Yes, you can replace a gas boiler with a heat pump in the UK. Many homeowners are explorin...

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Monobloc vs. Split Heat Pumps: Which One Is Right for Your Home?

20th May, 2026 Comparisons

Monobloc vs. Split Heat Pumps:...

Choosing between a monobloc and a split heat pump depends on several factors. Key consider...

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Hybrid Air Source Heat Pump and Gas Boiler

20th May, 2026 Guides

Hybrid Air Source Heat Pump an...

A hybrid air source heat pump combines two effective technologies: an air source heat pump...

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How Long Do Heat Pumps Last?

20th May, 2026 Guides

How Long Do Heat Pumps Last?

Heat pumps have an average lifespan of about 15 to 25 years depending on care, usage, and...

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How Noisy Are Air Conditioners? Quietest Models in the UK (2026)

20th May, 2026 Comparisons

How Noisy Are Air Conditioners...

Most modern air conditioners are much quieter than many homeowners expect, with some of th...

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Air Conditioning Costs

20th May, 2026 Guides

Air Conditioning Costs

In discussing air conditioning, it's important to understand the different systems availab...

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What is an air conditioning condenser unit?

20th May, 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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Can I Have Air Conditioning and a Gas Boiler?

20th May, 2026 Guides

Can I Have Air Conditioning an...

Achieve year-round comfort in your boiler-heated home by integrating efficient air conditi...

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Can You Pair Radiators With Heat Pumps?

20th May, 2026 Guides

Can You Pair Radiators With He...

Choosing the right radiator for a heat pump is crucial. The performance can vary depending...

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Heat Pumps For Flats: Essential Information

20th May, 2026 Advice

Heat Pumps For Flats: Essentia...

Heat pumps can be installed in flats, but there are some important factors to consider.

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Ground Source Heat Pump Servicing Cost

20th May, 2026 Guides

Ground Source Heat Pump Servic...

Regular servicing of a ground source heat pump is essential to ensure its efficiency and l...

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