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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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

What is Boiler Commissioning?

30th May, 2025 Guides

What is Boiler Commissioning?

Boiler commissioning is an essential part of installing a new boiler system. It involves a...

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How to Flush Central Heating System

30th May, 2025 Guides

How to Flush Central Heating S...

Flushing a central heating system means cleaning out the inside of the pipes, radiators, a...

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Repressurise Vaillant Boiler

30th May, 2025 Guides

Repressurise Vaillant Boiler

Low pressure in a Vaillant boiler is a common issue for many UK households. It affects com...

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Why Is Boiler Water Treatment Important?

30th May, 2025 Guides

Why Is Boiler Water Treatment...

In boiler systems, water treatment involves several techniques. These methods remove impur...

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How To Diagnose Boiler Fan Issues And Fix Them Safely

30th May, 2025 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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What is Central Heating Sludge?

30th May, 2025 Guides

What is Central Heating Sludge...

Sludge in a central heating system is a mix of dirt, rust, and limescale. Over time, these...

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How to Properly Ventilate a Boiler Room for Safety

30th May, 2025 Guides

How to Properly Ventilate a Bo...

Proper ventilation in a boiler room is essential for safety and efficiency. Without adequa...

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Can I Get Help With A New Boiler If I Am Not On Benefits

30th May, 2025 Guides

Can I Get Help With A New Boil...

A free boiler grant is part of a UK government scheme aimed at making homes more energy ef...

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Boiler Heat Exchanger Replacement Cost

30th May, 2025 Guides

Boiler Heat Exchanger Replacem...

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

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Will My Boiler Work If the Water Is Off?

30th May, 2025 Guides

Will My Boiler Work If the Wat...

Turning off the water supply might cause concern about the boiler, but most boilers are bu...

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Boiler Manifold - Role, Function, and Cost Guide

30th May, 2025 Guides

Boiler Manifold - Role, Functi...

A boiler manifold is a vital component in many heating systems. It acts as the central hub...

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Boiler Electrodes

30th May, 2025 Guides

Boiler Electrodes

Boiler electrodes are key components in gas, combi, and electric boilers. They serve cruci...

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