All Heating One


A combination boiler gets its name from the fact that it serves as both hot water and central heating device. Because this type of boiler receives its water straight from the mains, there is no need for a hot or cold-water cylinder or storage tank. In this piece, we will look at the benefits and drawbacks of Installing a combi-boiler. We hope that at the end of this piece, you will know whether this type of boiler is appropriate for your unique needs.

Let us begin by looking at the downsides of the combi-boiler:


1: Struggles to fulfill increased water demand

Yes, you heard correctly! Because a combi-boiler gets all its water supply straight from the mains, it will struggle to fulfill a large water demand. For example, if three people turn on taps in separate rooms at the same time, the water pressure drops substantially. This is because a combi-boiler lacks the benefit of a backup water tank to fulfill this level of demand. As a result, bigger estates with a high population may be better suited to a traditional boiler that also includes a water tank.

2: Excessively complicated setup

Combi-boilers require sophisticated processors and electrical devices to function. If something goes wrong, the expense for repairing a combi-boiler is often more than for more traditional boilers. Combi-boilers can take longer to repair. This, in turn, raises labor expenses, as most boiler engineers are paid on an hourly basis.

3: The slower flow of water

Because a combi-boiler pulls its water straight from the mains rather than a water tank, it may take longer to fill a bath than a typical boiler.

4. When a combi-boiler fails, you lose both hot water and central heating.

Your central heating and hot water are both powered by a combi-boiler. As a result, if your combi-boiler fails, you will be unable to get hot water or central heating. Traditional boilers are only capable of powering your central heating. Hot water is supplied by a separate boiler. As a result, with typical boilers, you’re only likely to have intermittent hot water or central heating outages.

Let us now look at the benefits of combi-boilers:


1: Small size

Combi-boilers are much smaller than traditional boilers. There is no need to reserve hot water, as with a traditional boiler. Combi-boilers do away with the requirement for a huge hot water cylinder, which is often seen in airing cupboards. Combi-boilers, on the other hand, take only a little amount of room in your kitchen or upstairs airing closet.

There is no need for a cold-water storage facility, which frees up roof or loft space. This is because combi-boilers get their cold-water supply straight from the mains. The lack of water storage facilities also provides combi-boilers with an advantage in terms of installation. When it comes to installation, the absence of a water storage container means less effort and bother. The absence of a cold-water unit also has a negative impact.

2: Outstanding efficiency

Combi boilers are extremely efficient, with up to 90% efficiency. Heating your home is thus less expensive when compared to traditional boilers.

3: Quick access to hot water and central heating

There is no need to wait for the water to heat up. Combi-boilers heat water based on demand. As a result, combi-boilers are quite useful when many people are waiting in line to use the same restroom. Because hot water is given ‘on-demand,’ there is no chance of water running out, as there is with a traditional boiler.   

4: You save money!

Because water is heated in little amounts, you save money when compared to typical boilers, which heat large amounts of water even if you only want to wash your hands! This is because traditional boilers need you to heat an entire cylinder full of water, even if you only want to wash the dishes! As a result, as compared to traditional boilers, combi-boilers have a lower carbon footprint.


At ALL HEATING ONE, we provide our customers with the ability to estimate the cost of installing a new boiler in their house. Our free quotation service will consider aspects such as your present central heating system, the number of radiators you have, and whether you want a gas combi boiler or an oil or LPG boiler. If you’d like to get an idea of how much a new combi boiler installation would cost, try our instant, online quote now, which will also show you any available combi boiler offers.

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