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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

Worcester Bosch Combi Boiler Hot Water Goes Cold

05th February, 2026 Guides

Worcester Bosch Combi Boiler H...

Ensuring consistent hot water supply in your Worcester Bosch combi boiler often necessitat...

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What Is a Combi Boiler?

05th February, 2026 Reviews

What Is a Combi Boiler?

Is a combi boiler worth it? Would your home benefit from a combi boiler? We will find out....

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What Size Combi Boiler Do I Need?

05th February, 2026 Advice

What Size Combi Boiler Do I Ne...

Find out whether the size of your combi boiler will make any difference to its capabilitie...

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How many hours should heating be on in the UK?

05th February, 2026 Guides

How many hours should heating...

Summary sentence for the blog: Learn the optimal duration for heating usage in the UK with...

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

05th February, 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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Best Heating for Off-Grid Homes

05th February, 2026 Guides

Best Heating for Off-Grid Home...

Homes that are not connected to the mains gas grid in the UK need alternative heating syst...

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Boiler Upgrade Scheme

05th February, 2026 Guides

Boiler Upgrade Scheme

The Boiler Upgrade Scheme is a pivotal initiative aimed at supporting the decarbonisation...

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Vokera Boiler Flashing Green Light - How to Fix

05th February, 2026 Guides

Vokera Boiler Flashing Green L...

The green light is part of the boiler's diagnostic system; a flashing signal often points...

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Different Types Of Radiator Bleed Valves/Knobs Explained

05th February, 2026 Guides

Different Types Of Radiator Bl...

Radiator dials, often referred to as bleed valves or knobs, are crucial for managing the p...

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Ideal Boiler Status C

05th February, 2026 Guides

Ideal Boiler Status C

The "Status C" on an Ideal boiler's display simply indicates that the boiler is operating...

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Ideal Boiler Status 00 - How to Fix

05th February, 2026 Guides

Ideal Boiler Status 00 - How t...

Ideal boilers provide a variety of fault codes to help diagnose issues. Understanding thes...

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Boiler Installation Glasgow

05th February, 2026 Guides

Boiler Installation Glasgow

Boiler installation is a critical process entailing the careful selection and fitting of a...

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