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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

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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Clean Heat Market Mechanism (CHMM) 2026: Updated

05th January, 2026 News

Clean Heat Market Mechanism (C...

The Clean Heat Market Mechanism is a UK policy making boiler manufacturers sell more heat...

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The Best Air Source Heat Pumps 2026

05th January, 2026 Advice

The Best Air Source Heat Pumps...

This guide outlines the best air source heat pumps for UK homes in 2026 and what to know b...

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The Best Budget Boiler in 2026

19th December, 2025 Guides

The Best Budget Boiler in 2026

The best budget boilers are Ideal, Alpha, Baxi, Worcester Bosch and Vaillant models, compa...

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What is an Airing Cupboard?

19th December, 2025 Guides

What is an Airing Cupboard?

An airing cupboard is a heated storage space that uses warmth from a hot water cylinder or...

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Worcester Bosch vs Vaillant Boilers - Which is Better?

19th December, 2025 Advice

Worcester Bosch vs Vaillant Bo...

A clear comparison of Worcester Bosch and Vaillant Boilers and why Worcester Bosch is ofte...

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Combi Boiler Pressure: What It Should Be And How To Fix Issues

12th December, 2025 Guides

Combi Boiler Pressure: What It...

A combi boiler should be around 1.0 to 1.5 bar when cold and up to about 2.0 bar when hot.

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