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Stephen Day

Gas Safe Engineer

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.

Expertise & Focus Areas

  • 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

Best Combi Boilers For Kitchen Cupboards

11th August, 2025 Guides

Best Combi Boilers For Kitchen...

A combi (combination) boiler is a type of domestic boiler that ‘combines’ a home’s central...

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Combi Boilers vs Conventional Boilers

11th August, 2025 Guides

Combi Boilers vs Conventional...

Combi boilers, also known as combination boilers, are compact units that serve as both a c...

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What Is a Combi Boiler?

11th August, 2025 Reviews

What Is a Combi Boiler?

Is a combi boiler worth it? Would your home benefit from a combi boiler? We will find out....

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Ideal Boilers - Vogue Range

08th August, 2025 Guides

Ideal Boilers - Vogue Range

The Ideal Boilers' Vogue Range stands out as a premium selection, consistent with the comp...

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Ideal Boiler Status C

08th August, 2025 Guides

Ideal Boiler Status C

The "Status C" on an Ideal boiler's display simply indicates that the boiler is operating...

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Baxi Boiler Reviews

08th August, 2025 Reviews

Baxi Boiler Reviews

Baxi, a significant player in the UK heating industry, has carved out a reputation for del...

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Navien Combi Boiler Costs

08th August, 2025 Guides

Navien Combi Boiler Costs

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

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Most Energy Efficient Boilers in 2025 (UK Guide)

08th August, 2025 Guides

Most Energy Efficient Boilers...

The efficiency of your boiler may not be something you pay much attention to, but is it co...

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Which Worcester Bosch Boiler is Best?

08th August, 2025 Comparisons

Which Worcester Bosch Boiler i...

Choosing the right boiler for your property is crucial to ensure optimal heating efficienc...

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Boiler Brands To Avoid - Worst Boilers in 2025

08th August, 2025 Guides

Boiler Brands To Avoid - Worst...

Looking for a guide to which boilers you shouldn’t buy? Look no further.

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Ideal vs Worcester Bosch Boilers

08th August, 2025 Comparisons

Ideal vs Worcester Bosch Boile...

When choosing between an Ideal or Worcester Bosch boiler, it can be tricky to know which i...

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What is a Thermocouple?

07th August, 2025 Guides

What is a Thermocouple?

A thermocouple is a critical component in a boiler system. It acts as a safety device, ens...

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