Stephen Day profile photo

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.

LinkedIn

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

How Much Does Moving a Boiler Cost?

09th April, 2026 Guides

How Much Does Moving a Boiler...

Moving a boiler usually costs a few hundred pounds for a short move, but more complex relo...

read article arrow Read Article
Baxi Boiler E133 Error Code

08th April, 2026 Guides

Baxi Boiler E133 Error Code

A Baxi E133 error usually means your boiler has failed to ignite because of a gas supply i...

read article arrow Read Article
Ideal F2 Error Code - How to Fix

27th March, 2026 Guides

Ideal F2 Error Code - How to F...

Ideal F2 usually means flame loss.

read article arrow Read Article
Worcester Boiler Fault 227

27th March, 2026 Guides

Worcester Boiler Fault 227

Boiler systems utilise error codes as an internal diagnostic tool. They offer a swift indi...

read article arrow Read Article
Megaflow System - What is a Megaflow System and How Much do they Cost?

25th March, 2026 Guides

Megaflow System - What is a Me...

A Megaflow system is often worth considering if your home needs stronger hot water pressur...

read article arrow Read Article
How to Fix Boiler Airlock: Expert Guide

20th March, 2026 Guides

How to Fix Boiler Airlock: Exp...

A boiler airlock is usually a heating system circulation issue caused by trapped air, rath...

read article arrow Read Article
Vaillant Boiler F22

19th March, 2026 Guides

Vaillant Boiler F22

The Vaillant F22 fault means your boiler pressure is too low and needs topping up.

read article arrow Read Article
F83 Vaillant Error Code

19th March, 2026 Guides

F83 Vaillant Error Code

A Vaillant F83 fault usually means the boiler is not detecting the temperature rise it exp...

read article arrow Read Article
F29 Vaillant Fault Code

19th March, 2026 Guides

F29 Vaillant Fault Code

A Vaillant F29 error usually means your boiler has failed to ignite due to a flame loss, o...

read article arrow Read Article
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...

read article arrow Read Article
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...

read article arrow Read Article
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...

read article arrow Read Article