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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 Servicing Guide

16th March, 2026 Advice

Boiler Servicing Guide

Boiler servicing is an annual inspection carried out by a Gas Safe engineer to check that...

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Air Conditioners vs Air Coolers: What’s Best for UK Homes in 2026?

13th March, 2026 Comparisons

Air Conditioners vs Air Cooler...

Understand the key differences between air conditioners and air coolers to choose the best...

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Boiler Overflow Pipe Leaking

06th March, 2026 Advice

Boiler Overflow Pipe Leaking

A leaking overflow pipe often means your boiler is releasing excess water due to high pres...

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How the Iran-US conflict could affect UK energy bills

05th March, 2026 News

How the Iran-US conflict could...

Rising tensions in the Middle East can influence global oil and gas markets, which can eve...

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Fitting A New Boiler to an Old System - Mega Guide

26th February, 2026 Guides

Fitting A New Boiler to an Old...

Replacing an old boiler with a new one involves several key steps that ensure safe and eff...

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This Valentine's Day we’re asking - Does the size of your pipe really matter? 2026

12th February, 2026 Guides

This Valentine's Day we’re ask...

This Valentine’s Day we want to let you in on a dirty little secret…

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Ideal Temperature at Home

09th February, 2026 Advice

Ideal Temperature at Home

Finding and maintaining the right temperature in your home can feel like a constant battle...

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Are Heat Only Boilers Still Used?

09th February, 2026 Guides

Are Heat Only Boilers Still Us...

Despite technological advancements, heat-only boilers remain a prevalent choice for many h...

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Boiler Parts and Their Functions

06th February, 2026 Guides

Boiler Parts and Their Functio...

Understanding the different parts of a boiler and their functions is essential for homeown...

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Baxi Boiler Error Codes

06th February, 2026 Guides

Baxi Boiler Error Codes

The complete guide to what each Baxi boiler error code means and how to fix it!

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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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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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