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Boiler help & advice

Expert guides and advice to help you make informed decisions.

Vaillant Comfort Mode (and Flashing C on a Vaillant Boiler)

20th May, 2026

Guides

Vaillant Comfort Mode (and Flashing...

Vaillant Comfort Mode is a feature available on Vaillant boilers designed to provide a consistently warm environment.

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Stephen Day

Gas Safe Engineer

Vaillant Combi Boilers

20th May, 2026

Guides

Vaillant Combi Boilers

At iHeat We’ve joined forces with Vaillant UK to become the first online company to install Vaillant boilers.

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Stephen Day

Gas Safe Engineer

Vaillant Combi Boiler Costs

20th May, 2026

Guides

Vaillant Combi Boiler Costs

As Vaillant continues to innovate, integrating smart technology and improving energy performance, their boilers maintain a strong reputation for relia...

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Stephen Day

Gas Safe Engineer

Vaillant Boiler Red Light

20th May, 2026

Guides

Vaillant Boiler Red Light

Understanding what the red light and associated fault codes mean is vital for boiler owners. It ensures that the appropriate steps can be taken to rec...

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Stephen Day

Gas Safe Engineer

Vaillant Boiler Parts 2026

20th May, 2026

Guides

Vaillant Boiler Parts 2026

Vaillant boilers use a variety of parts to ensure efficient operation. This section looks at common replacement parts and specific components unique t...

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Stephen Day

Gas Safe Engineer

Vaillant Boiler Not Working, No Fault Code

20th May, 2026

Guides

Vaillant Boiler Not Working, No Faul...

Boiler error codes provide essential diagnostics for homeowners and engineers alike, signalling specific faults within the heating system.

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Stephen Day

Gas Safe Engineer

Vaillant Boiler No Hot Water

20th May, 2026

Guides

Vaillant Boiler No Hot Water

Understanding why a Vaillant boiler fails to provide hot water entails recognising the signs of trouble, pinpointing the root causes, and applying the...

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Stephen Day

Gas Safe Engineer

Understanding Boiler kW (Kilowatts) & How To Measure

20th May, 2026

Guides

Understanding Boiler kW (Kilowatts)...

When it comes to choosing a boiler for your home, understanding the concept of kilowatts (kW) is essential.

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Stephen Day

Gas Safe Engineer

Underfloor Heating with a Combi Boiler

20th May, 2026

Guides

Underfloor Heating with a Combi Boil...

Integrating underfloor heating with existing combi boilers can be a practical option for many. However, not all boilers are suitable for such systems.

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Stephen Day

Gas Safe Engineer

Why You Can Trust iHeat

20th May, 2026

News

Why You Can Trust iHeat

Over 10,000 reviews and an 'Excellent' rating on Trustpilot, thats some good going!

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Rick Hope

Managing Director

Why Is My Shower Cold & Not Getting Hot?

20th May, 2026

Advice

Why Is My Shower Cold & Not Getting...

There’s nothing worse than expecting to have a nice warm shower… only to discover your water is in fact running cold.

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Stephen Day

Gas Safe Engineer

Shower Going Hot and Cold - Combi Boiler

20th May, 2026

Guides

Shower Going Hot and Cold - Combi Bo...

Within homes across the UK, the combination boiler, commonly known as a combi boiler, serves as a high-efficiency water heater and a central heating u...

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Stephen Day

Gas Safe Engineer