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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

New Central Heating System Costs - (Need To Upgrade?)

20th May, 2026 Guides

New Central Heating System Cos...

By upgrading your old, inefficient heating system you can improve your home’s temperature...

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Can I Get Help With A New Boiler If I Am Not On Benefits

20th May, 2026 Guides

Can I Get Help With A New Boil...

A free boiler grant is part of a UK government scheme aimed at making homes more energy ef...

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When Does a New Boiler Need Its First Service?

20th May, 2026 Advice

When Does a New Boiler Need It...

Having your boiler serviced regularly is important for ensuring its safety and efficiency,...

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Navien Combi Boiler Costs

20th May, 2026 Guides

Navien Combi Boiler Costs

Navien combi boilers have secured a competitive edge by providing both central heating and...

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Navien Boiler Reviews

20th May, 2026 Reviews

Navien Boiler Reviews

Navien, a revered boiler manufacturer, has established a reputation for innovation and rel...

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Navien Boiler Error Codes

20th May, 2026 Guides

Navien Boiler Error Codes

Troubleshoot common Navien boiler error codes with iHeat, a leading UK provider of heating...

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Is It Safe to Turn Off a Combi Boiler?

20th May, 2026 Guides

Is It Safe to Turn Off a Combi...

Turning off a combi boiler can be safe, but certain factors should be considered.

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Is it Cheaper to Replace Your Boiler in Summer?

20th May, 2026 Guides

Is it Cheaper to Replace Your...

You may be wondering when the best time to replace your old, inefficient boiler is, and wh...

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Is a Heat Pump Cheaper to Run Than a Boiler?

20th May, 2026 Comparisons

Is a Heat Pump Cheaper to Run...

In this UK heat pump vs new gas boiler comparison guide, we'll be taking a look at which t...

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How to Increase Pressure on Worcester Bosch Boiler Without Key

20th May, 2026 Guides

How to Increase Pressure on Wo...

A Worcester Bosch boiler is a complex machine with many components working together to hea...

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How to Improve Radiator Efficiency & Performance

20th May, 2026 Guides

How to Improve Radiator Effici...

Radiator efficiency plays a key role in maintaining a comfortable and cost-effective home....

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Ignition Lockout on Boiler

20th May, 2026 Guides

Ignition Lockout on Boiler

A boiler lockout occurs when a boiler detects a fault and shuts down to prevent further is...

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