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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

Ideal vs Worcester Bosch: Which Boiler Should You Choose?

14th September, 2026 Comparisons

Ideal vs Worcester Bosch: Whic...

Compare equivalent Ideal and Worcester Bosch boilers using published flow rates, dimension...

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Hive App Not Working? Checks for App, Hub and Thermostat

14th September, 2026 Guides

Hive App Not Working? Checks f...

Find out whether the problem is your Hive app, hub, thermostat or receiver, with practical...

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Dyson Air Conditioner: Do Dyson Fans Cool a Room?

14th September, 2026 Guides

Dyson Air Conditioner: Do Dyso...

Dyson fans can help you feel cooler, but they do not lower room temperature like air condi...

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Y Plan Wiring Diagram

14th September, 2026 Guides

Y Plan Wiring Diagram

A Y Plan heating system is a design used in some homes to manage both central heating and...

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Why Does My Boiler Fire Up in the Night?

14th September, 2026 Guides

Why Does My Boiler Fire Up in...

Occasionally, boilers turn on during the night due to specific triggers. These include the...

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What is a Low Loss Header?

14th September, 2026 Guides

What is a Low Loss Header?

A low loss header is an essential part of a heating system. It acts as a bridge between th...

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Clean Heat Market Mechanism (CHMM) 2026: Updated

11th September, 2026 News

Clean Heat Market Mechanism (C...

The CHMM sets heat pump targets for boiler manufacturers, not homeowners.

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Oil Fired Boiler

10th September, 2026 Guides

Oil Fired Boiler

Oil-fired boilers use stored heating oil to provide heating and hot water, particularly in...

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Checking Your Boiler When Buying a New Home

10th September, 2026 Advice

Checking Your Boiler When Buyi...

Buying a new home is a massive investment and you’ll likely consider a number of different...

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Why Is Boiler Water Treatment Important?

10th September, 2026 Guides

Why Is Boiler Water Treatment...

In boiler systems, water treatment involves several techniques. These methods remove impur...

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Best Shower for Combi Boiler

07th September, 2026 Guides

Best Shower for Combi Boiler

A thermostatic mixer shower is generally the best shower for a combi boiler, combining the...

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Are Boiler Hot Water Storage Tanks a Necessity?

07th September, 2026 Guides

Are Boiler Hot Water Storage T...

You may be wondering, are hot water storage tanks essential to home heating and the runnin...

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