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 To Choose The Right Boiler For Your Home

03rd February, 2026 Guides

How To Choose The Right Boiler...

Choosing the right boiler for your home can be a stressful and overwhelming experience, bu...

read article arrow Read Article
Do I Need to Do Anything Prior to My Boiler Installation?

03rd February, 2026 Guides

Do I Need to Do Anything Prior...

Installing a new boiler is an important investment in your home, and there are several thi...

read article arrow Read Article
Egg Timer on Vaillant Boiler

03rd February, 2026 Guides

Egg Timer on Vaillant Boiler

The egg timer symbol on a Vaillant boiler signifies the activation of the anti-cycling fun...

read article arrow Read Article
Heat Pump Repair - 2026 Guide

02nd February, 2026 Guides

Heat Pump Repair - 2026 Guide

Help for when your heat pump is not working properly.

read article arrow Read Article
Ideal Boiler L2 Fault Code - How to Fix

02nd February, 2026 Guides

Ideal Boiler L2 Fault Code - H...

What the Ideal L2 error code means and what to do when your boiler will not stay lit.

read article arrow Read Article
Combining Air Source Heat Pumps And Solar Panels: UK Guide

16th January, 2026 Advice

Combining Air Source Heat Pump...

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

read article arrow Read Article
Best Heat-Only (Conventional) Boilers in 2026

14th January, 2026 Guides

Best Heat-Only (Conventional)...

The best heat-only (conventional) boilers in 2026 are the models that reliably power a hot...

read article arrow Read Article
Best System Boilers for 2026

14th January, 2026 Guides

Best System Boilers for 2026

A quick shortlist of the best system boilers in the UK for reliable heating and strong hot...

read article arrow Read Article
Best Electric Boilers 2026

12th January, 2026 Guides

Best Electric Boilers 2026

The best electric boilers in 2026 include models from Electric Heating Company, Heatrae Sa...

read article arrow Read Article
Navien NCB 300 Boiler Review

05th January, 2026 Reviews

Navien NCB 300 Boiler Review

Unlocking the Efficiency and Value of the Navien NCB 300 Boiler: A Comprehensive Guide for...

read article arrow Read Article
Best Electric Combi Boilers (Electric-Only Guide)

05th January, 2026 Guides

Best Electric Combi Boilers (E...

The best electric combi boilers in 2026 include models from Electric Heating Company, Heat...

read article arrow Read Article
UPDATED: Heat Pump Planning Permission: Do I Need It for My Home?

05th January, 2026 Guides

UPDATED: Heat Pump Planning Pe...

Heat pumps generally don't require planning permission in the UK, thanks to permitted deve...

read article arrow Read Article