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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

Ideal F1 Error Code - How To Fix

30th May, 2025 Guides

Ideal F1 Error Code - How To F...

Anytime a boiler isn’t operating as it should, it can be frustrating as well as time consu...

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This Valentine's Day we’re asking - Does the size of your pipe really matter? 2025

30th May, 2025 News

This Valentine's Day we’re ask...

This Valentine’s Day we want to let you in on a dirty little secret…

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Google Nest Thermostat Benefits

30th May, 2025 Reviews

Google Nest Thermostat Benefit...

A Google Nest smart thermostat can be a powerful tool in controlling home heating and thro...

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EPH Combi Pack 4 Thermostat

30th May, 2025 Reviews

EPH Combi Pack 4 Thermostat

A modern and capable thermostat can often be overlooked as a key tool, synchronising with...

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What Does Boiler ErP mean? - Energy Efficiency Guide

30th May, 2025 Advice

What Does Boiler ErP mean? - E...

When it comes to buying a new boiler, there can be some unfamiliar terms or phrases that d...

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Busting Common Boiler Myths

30th May, 2025 Advice

Busting Common Boiler Myths

We understand that not everyone is a boiler expert, and despite the at times confusing app...

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Combi Boilers - Advantages And Disadvantages

30th May, 2025 Comparisons

Combi Boilers - Advantages And...

Combi boilers are by far the most popular type of home heating system in the UK, and with...

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Boiler Circulation Pump Replacement Costs

30th May, 2025 Guides

Boiler Circulation Pump Replac...

Here at iHeat we’re boiler experts, this includes an extensive bank of component knowledge...

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F75 Vaillant Error Code

30th May, 2025 Guides

F75 Vaillant Error Code

One of the most common and frustrating error codes your Vaillant boiler can present to you...

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Balancing Your Radiators

30th May, 2025 Advice

Balancing Your Radiators

At iHeat we’re experts in anything relating to keeping your home heated and comfortable, t...

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Boiler Condemned? What to do!

30th May, 2025 Advice

Boiler Condemned? What to do!

If your boiler has been recently condemned, it can be a cause for concern as panic and ind...

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iHeat Voucher Codes & Discounts

30th May, 2025 News

iHeat Voucher Codes & Discount...

Here at iHeat we only stock the most efficient, modern gas boilers, manufactured by premiu...

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