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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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Dyson Air Con

05th January, 2026 Guides

Dyson Air Con

Dyson's 2026 range of air conditioning products offers a variety of models packed with adv...

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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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Thermostats for Heat Pumps Mega Guide

05th January, 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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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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Ground source heat pumps vs air source heat pumps

05th January, 2026 Comparisons

Ground source heat pumps vs ai...

Deciding between air source and ground source heat pumps depends on various factors. Homeo...

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Ground Source Heat Pump Efficiency

05th January, 2026 Guides

Ground Source Heat Pump Effici...

While GSHPs are beneficial, several factors can affect their performance. Proper installat...

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Ground Source Heat Pump Servicing Cost

05th January, 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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Best Portable Air Conditioner UK

05th January, 2026 Guides

Best Portable Air Conditioner...

Portable air conditioners are movable units designed to cool specific areas. They are espe...

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