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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

Boiler Ticking Noise

06th February, 2026 Guides

Boiler Ticking Noise

When a boiler starts making a ticking noise, it's crucial to carefully examine the source...

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How To Diagnose Boiler Fan Issues And Fix Them Safely

06th February, 2026 Guides

How To Diagnose Boiler Fan Iss...

A boiler fan is an important part of modern boilers. It ensures proper combustion by pushi...

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Floor Standing Boiler: Worcester Bosch Greenstar CDi Highflow Guide

06th February, 2026 Guides

Floor Standing Boiler: Worcest...

The Worcester Bosch Greenstar Highflow CDi series stands out with its floor-standing desig...

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Combi Boiler Pipes Explained

06th February, 2026 Guides

Combi Boiler Pipes Explained

Understanding the key components of combi boiler pipework is essential for making informed...

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One Radiator Not Working In One Room

06th February, 2026 Guides

One Radiator Not Working In On...

A radiator not heating up properly can be frustrating. There are several reasons this migh...

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How Long Do Heat Pumps Last?

06th February, 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 To Drain Central Heating System

06th February, 2026 Guides

How To Drain Central Heating S...

Understanding how to properly drain the system is vital for homeowners and DIY enthusiasts...

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Boiler Filter - Mega Guide

06th February, 2026 Guides

Boiler Filter - Mega Guide

A boiler filter is an essential component for maintaining the efficiency and longevity of...

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Boiler Service Bolton

06th February, 2026 Guides

Boiler Service Bolton

Boiler servicing comprises a set of inspections and tests conducted by a qualified enginee...

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No Water Coming Out Of Hot Tap (Combi Boiler)

06th February, 2026 Guides

No Water Coming Out Of Hot Tap...

Addressing the lack of hot water from a tap usually starts with understanding how a combi...

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Boiler Heat Exchanger Replacement Cost

06th February, 2026 Guides

Boiler Heat Exchanger Replacem...

A boiler heat exchanger is a crucial component in heating systems. It allows heat transfer...

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Alpha Boilers Reviews

06th February, 2026 Reviews

Alpha Boilers Reviews

Alpha Boilers have ascended to notable esteem in the UK heating market, with a focal ethos...

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