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Do you Need a Water Tank with a Combi Boiler?

Should you have a water tank with your combi boiler, and what is the most cost effective heating system based on your household usage? We’ll guide you through combi boilers and water tanks.

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One of the many benefits of a combi boiler is that you don’t need separate water tanks or cylinders. Not only could these boilers save you money, but they could also save you a huge amount of space in your home too.

What is a combi boiler system?

A combi boiler system supplies hot water directly to your taps and radiators without any need for a storage tank. 

They are high efficiency water heaters and a central heating system in one compact unit, meaning there is no need for a hot water storage cylinder.

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What is a water cylinder?

A hot water cylinder is a well insulated tank that stores water after it has been heated. The water is heated through your boiler system and is then stored at temperature in the water cylinder, ready for use whenever you need it. 

Storing hot water this way means there’s no need to run the heating system constantly, which can result in lower bills without having to put up with cold water. 


Do combi boilers store hot water?

Combi boilers heat water directly from the mains when a tap is turned on, which means it does not need to store water in the same way a boiler with a water cylinder does. This allows for a high volume of hot water consumption.


Do you need a water tank with a combi boiler?

No, you do not need a water tank with a combi boiler since this type of boiler does not store the water. 

Since the water is taken directly from the mains and then heated, there is no purpose for a water tank.


Does a combi boiler need a tank in the loft?

No, combi boilers do not need to have a water tank in your loft since the water comes from the mains, so there is no need to store water in the same way you would have to with a system boiler. 


Does a combi boiler replace a water tank?

Yes, combi boilers act as both a water heater and central heating system, which is why there is no need for a water tank. Combi boilers don’t actually hold the water, but instead heat the water from the main immediately for use in taps and radiators.

If you currently have a system boiler that requires a water tank, you could save a lot of space and money by switching to a combi boiler.

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Can you store the water heated by a combi boiler?

Storage combi boilers provide the same benefits as a normal combi boiler, except they also come with a built-in small store of hot water. The Worcester Bosch HighFlow 440 CDi floor standing boiler is an example of this type of boiler. 

It is a great solution if your home has more than one bathroom, and is usually fitted in larger homes.

Storage combi boilers have many advantages including:

  • There is no a hot water cylinder
  • There is no tank in the loft, meaning less pipework
  • No huge delays in domestic hot water thanks to the integrated hot water storage
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