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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

Do Radiator Covers Block Heat?

08th December, 2025 Guides

Do Radiator Covers Block Heat?

Radiator covers can reduce heat output if airflow is restricted, but the effect varies by...

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Leaking Overflow Pipe - Causes and Fixes

05th December, 2025 Advice

Leaking Overflow Pipe - Causes...

A leaking overflow pipe is usually caused by high boiler pressure or a faulty valve.

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Do You Need New Radiators for Heat Pumps?

05th December, 2025 Advice

Do You Need New Radiators for...

Most homes need some radiators upgraded for a heat pump, but usually not all of them.

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Combining Air Source Heat Pumps And Solar Panels: UK Guide

05th December, 2025 Advice

Combining Air Source Heat Pump...

Most homes can lower heating costs by combining air source heat pumps with solar panels.

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Hive App Not Working? Here's Why And How to Fix

28th November, 2025 Guides

Hive App Not Working? Here's W...

Most Hive heating issues come from lost connection, low batteries, receiver faults or boil...

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Leaking Radiator Valve (Lockshield)

28th November, 2025 Guides

Leaking Radiator Valve (Locksh...

A leaking lockshield valve is usually caused by a loose gland nut, worn seal or corrosion,...

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High Temperature Heat Pumps UK - Are They Worth It?

28th November, 2025 Advice

High Temperature Heat Pumps UK...

High temperature heat pumps work like boilers without needing radiators, but they cost mor...

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Why is My Boiler Not Working?

27th November, 2025 Guides

Why is My Boiler Not Working?

Maintaining a boiler in good working order is essential for its efficiency and longevity....

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Ideal vs Worcester Bosch Boilers

27th November, 2025 Comparisons

Ideal vs Worcester Bosch Boile...

When choosing between an Ideal or Worcester Bosch boiler, it can be tricky to know which i...

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No Power to Boiler

27th November, 2025 Guides

No Power to Boiler

Find out why your boiler has no power and the key checks you can safely do before calling...

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Types Of Air Conditioning - Options For UK Homes

19th November, 2025 Advice

Types Of Air Conditioning - Op...

This guide helps you choose the best type of air conditioning for your UK home.

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How Much Does a Boiler Power Flush Cost?

14th November, 2025 Advice

How Much Does a Boiler Power F...

A boiler power flush in the UK typically costs £300 to £600. It’s a one-time cleaning that...

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