The combi boiler is becoming quite popular with a majority of homeowners in the United States. That’s because of the numerous benefits of these systems. A combi boiler combines a water heater and central heating boiler into one compact and efficient unit.


The system provides hot water and central heating without the requirement for a cold water tank in the loft and a hot water cylinder in an airing cupboard. Even though the combi boiler is not the best space-saving option available today, it can limit the amount of wasted heat compared to traditional heaters. Here is how a combi boiler works.

A combi boiler will take water from the main line and heat it when required. In fact, the unit is in standby mode when there is no demand for hot water. The water from the main line will pass through a highly efficient heat exchanger to produce hot water that comes out of the faucets.

The heat exchanger will transfer the heat of burnt gas into the cold water to heat it. The heated water is then delivered to the hot water faucets as required. The combi boiler doesn’t have a hot water tank similar to the traditional water heater. Hence, it saves energy compared to the conventional units. That is because there is no heat loss associated with stored hot water.

The unit will simply create hot water only when you require it.

The combi system will pump hot water around the heating system of your home in a completely sealed system. Since the unit has an expansion tank internally, it doesn’t require feeding an external expansion tank in the loft. This will help save a lot of space in your home.

One disadvantage with the combi system is that it would struggle to produce hot water and central heating at the same time. Hence, the system will give priority to hot water in your home whenever the hot water faucet is open.


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Combi boilers are very efficient since they don’t have to store hot water similar to traditional water heaters. Hence, the heat loss is quite minimal. You can save money on gas due to this reason. Some of the benefits of combi systems include:

. Hot water available 24/7 on request
. The system is quite compact and can sit in your kitchen without taking up a lot of space.
. It produces hot water only when needed. The heat loss is quite minimal due to this reason.
. No need for a hot water tank in an airing cupboard.

You should find a reliable technician to install a combi boiler in your home or office. The company should have experience in dealing with the latest combi systems on the market.

Check the reputation, experience, knowledge, and credentials of the installation company before you decide to work with them. Customer reviews are also important in this regard. The above article provides information on how a combi boiler operates and the benefits of such a system.