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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

Best Heat-Only (Conventional) Boilers in 2026

14th January, 2026 Guides

Best Heat-Only (Conventional)...

The best heat-only (conventional) boilers in 2026 are the models that reliably power a hot...

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Best System Boilers for 2026

14th January, 2026 Guides

Best System Boilers for 2026

A quick shortlist of the best system boilers in the UK for reliable heating and strong hot...

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Best Electric Boilers 2026

12th January, 2026 Guides

Best Electric Boilers 2026

The best electric boilers in 2026 include models from Electric Heating Company, Heatrae Sa...

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Navien NCB 300 Boiler Review

05th January, 2026 Reviews

Navien NCB 300 Boiler Review

Unlocking the Efficiency and Value of the Navien NCB 300 Boiler: A Comprehensive Guide for...

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Best Electric Combi Boilers (Electric-Only Guide)

05th January, 2026 Guides

Best Electric Combi Boilers (E...

The best electric combi boilers in 2026 include models from Electric Heating Company, Heat...

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UPDATED: Heat Pump Planning Permission: Do I Need It for My Home?

05th January, 2026 Guides

UPDATED: Heat Pump Planning Pe...

Heat pumps generally don't require planning permission in the UK, thanks to permitted deve...

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Oil Boiler Ban

05th January, 2026 Guides

Oil Boiler Ban

As preparation steps up for the transition from oil boilers, homeowners confront a multifa...

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Busting Common Boiler Myths

05th January, 2026 Advice

Busting Common Boiler Myths

We understand that not everyone is a boiler expert, and despite the at times confusing app...

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Best Heat Pumps For Underfloor Heating

05th January, 2026 Guides

Best Heat Pumps For Underfloor...

There has been a lot of hype surrounding heat pumps within the heating industry as of late...

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Best Home EV Chargers

05th January, 2026 Guides

Best Home EV Chargers

Electric vehicles (EVs) have transformed the way we think about personal transportation, n...

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Most Energy Efficient Boilers in 2026 (UK Guide)

05th January, 2026 Guides

Most Energy Efficient Boilers...

The efficiency of your boiler may not be something you pay much attention to, but is it co...

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Best UK Boiler Cover 2026

05th January, 2026 Guides

Best UK Boiler Cover 2026

A broken boiler often means a cold house with no access to heating or hot water, leaving m...

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