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

Radiators Not Heating Up: How to Fix?

04th November, 2025 Guides

Radiators Not Heating Up: How...

If your radiators aren’t heating up, it’s usually caused by trapped air, sludge, or a boil...

read article arrow Read Article
How long does it take to fit a new boiler?

04th November, 2025 Guides

How long does it take to fit a...

Most boiler installations take between one and two days depending on your current setup an...

read article arrow Read Article
Can a Boiler Lose Pressure Without a Leak?

04th November, 2025 Guides

Can a Boiler Lose Pressure Wit...

If your boiler keeps losing pressure but you can’t see a leak, it could be caused by trapp...

read article arrow Read Article
Energy Saving With Your Boiler

03rd November, 2025 Advice

Energy Saving With Your Boiler

For most homes in the UK, the cost of heating and hot water can be very pricey. That's why...

read article arrow Read Article
Why Gas Safety Matters

03rd November, 2025 News

Why Gas Safety Matters

At iHeat, we take gas safety very seriously, ensuring that all our boiler installers are G...

read article arrow Read Article
Which Boiler Brands Do iHeat Stock?

03rd November, 2025 Advice

Which Boiler Brands Do iHeat S...

At iHeat we want our customers to receive only the best boilers available, that’s why we s...

read article arrow Read Article
Ground Source Heat Pump Costs

03rd November, 2025 Guides

Ground Source Heat Pump Costs

Heat pumps are an extremely popular topic of conversation amongst homeowners and heating i...

read article arrow Read Article
Heat Pumps vs Modern Gas Boilers

03rd November, 2025 Comparisons

Heat Pumps vs Modern Gas Boile...

In times of eye-watering energy prices and home heating bills, some debate which type of h...

read article arrow Read Article
Which Boiler is Best for an Apartment or Flat?

03rd November, 2025 Advice

Which Boiler is Best for an Ap...

When your old boiler breaks down and it comes time to replace it with a new one, it may se...

read article arrow Read Article
Best Boiler Brands in the UK (2025) Top Manufacturers

28th October, 2025 Guides

Best Boiler Brands in the UK (...

Choose the best boiler brand for your home with the iHeat easy guide.

read article arrow Read Article
Best Boilers for Big Families (Large 5 Bedroom House)

28th October, 2025 Guides

Best Boilers for Big Families...

iHeat's guide to the best boilers for big families and larger properties. We explain the d...

read article arrow Read Article
No Power to Boiler

28th October, 2025 Guides

No Power to Boiler

Understanding the various reasons why a boiler may not switch on can save homeowners time...

read article arrow Read Article