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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

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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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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Worcester Bosch Boiler No Hot Water

07th August, 2025 Guides

Worcester Bosch Boiler No Hot...

When homeowners encounter a lack of hot water from their Worcester Bosch boiler, it's ofte...

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UPDATED: Heat Pump Planning Permission: Do I Need It for My Home?

01st August, 2025 Guides

UPDATED: Heat Pump Planning Pe...

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

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Thermostats for Heat Pumps Mega Guide

01st August, 2025 Guides

Thermostats for Heat Pumps Meg...

Heat pump thermostats play a crucial role in managing the temperature in homes. A heat pum...

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Most Efficient Way to Run Air Source Heat Pump

01st August, 2025 Guides

Most Efficient Way to Run Air...

Setting the right temperature with an air source heat pump is important for comfort and ef...

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