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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

Ravenheat Boiler - Combi Prices 2026

05th January, 2026 Guides

Ravenheat Boiler - Combi Price...

Ravenheat combi boilers are known for their affordability and efficiency. They include mod...

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The Pros & Cons of Air Source Heat Pumps in 2026

05th January, 2026 Guides

The Pros & Cons of Air Source...

Air Source Heat Pumps have become a popular choice for renewable heating in the UK. They e...

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Air Source Heat Pump Grant 2026

05th January, 2026 Guides

Air Source Heat Pump Grant 202...

An air source heat pump (ASHP) is a device that transfers heat from the outside air to pro...

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Boiler Plus - 2026 Guide

05th January, 2026 Guides

Boiler Plus - 2026 Guide

Boiler Plus is a set of energy efficiency standards introduced by the UK government. It ai...

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The Best Air Source Heat Pumps 2026

05th January, 2026 Advice

The Best Air Source Heat Pumps...

This guide outlines the best air source heat pumps for UK homes in 2026 and what to know b...

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The Best Budget Boiler in 2026

19th December, 2025 Guides

The Best Budget Boiler in 2026

The best budget boilers are Ideal, Alpha, Baxi, Worcester Bosch and Vaillant models, compa...

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What is an Airing Cupboard?

19th December, 2025 Guides

What is an Airing Cupboard?

An airing cupboard is a heated storage space that uses warmth from a hot water cylinder or...

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Boiler Pressure Too High: What It Means and How to Fix It

19th December, 2025 Advice

Boiler Pressure Too High: What...

High boiler pressure is usually anything above 2.5 bar on the pressure gauge when the heat...

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Worcester Bosch vs Vaillant Boilers - Which is Better?

19th December, 2025 Advice

Worcester Bosch vs Vaillant Bo...

A clear comparison of Worcester Bosch and Vaillant Boilers and why Worcester Bosch is ofte...

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Vaillant Boiler F22

12th December, 2025 Guides

Vaillant Boiler F22

The Vaillant F22 fault means your boiler pressure is too low and needs topping up.

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Combi Boiler Pressure: What It Should Be And How To Fix Issues

12th December, 2025 Guides

Combi Boiler Pressure: What It...

A combi boiler should be around 1.0 to 1.5 bar when cold and up to about 2.0 bar when hot.

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How To Bleed A Radiator

12th December, 2025 Advice

How To Bleed A Radiator

You bleed a radiator by turning off the heating, opening the bleed valve and releasing tra...

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