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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

Boiler Circulation Pump Replacement Costs

06th February, 2026 Guides

Boiler Circulation Pump Replac...

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

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Alpha E-Tec Hybrid Heat Pump

06th February, 2026 Advice

Alpha E-Tec Hybrid Heat Pump

You may have heard of a heat pump, you probably have heard of a boiler, you probably have...

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Potterton Boiler (Combi Range)

06th February, 2026 Guides

Potterton Boiler (Combi Range)

Potterton are a brand with a celebrated lineage of expertise when it comes to heating, Pot...

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Combi Boilers vs Conventional Boilers

06th February, 2026 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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Wall-mounted or floor-standing boiler?

06th February, 2026 Comparisons

Wall-mounted or floor-standing...

Choosing between a wall-mounted and a floor-standing boiler mostly depends on the type of...

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Ideal Boilers - Vogue Range

06th February, 2026 Guides

Ideal Boilers - Vogue Range

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

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What Should Boiler Pressure Be When Heating is Off?

06th February, 2026 Guides

What Should Boiler Pressure Be...

The efficiency and safety of a home's heating system hinge on maintaining the correct boil...

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Glow Worm Combi Boiler Costs

06th February, 2026 Guides

Glow Worm Combi Boiler Costs

A combi boiler, or combination boiler, is a high-efficiency water heater and a central hea...

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Oil Fired Boiler

06th February, 2026 Guides

Oil Fired Boiler

An oil fired boiler is a heating system that uses oil as its fuel to heat water for centra...

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Do Heat Pumps Work in Cold Weather?

06th February, 2026 Guides

Do Heat Pumps Work in Cold Wea...

As homeowners seek sustainable and cost-effective heating solutions, understanding the mec...

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Can Your Boiler Work Without Gas? Backup Heating Options for Your Home

06th February, 2026 Guides

Can Your Boiler Work Without G...

Standard boilers typically rely on gas as their primary fuel source. For homes without acc...

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What is an Immersion Heater and What Does it Cost?

06th February, 2026 Advice

What is an Immersion Heater an...

Everything UK homeowners need to know about immersion heaters and running costs.

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