How to remove combi boiler heat exchanger

About combination boiler

Combination boiler or combi boilers are the most commonly type of boilers which are used in UK for a reason. Unlike the system and conventional boilers which requires a hot storage cylinder, the combination cylinder is an all in one unit which produces hot water for taps and central heating. Also it saves a great space in your homes and its installation is easy and faster comparative to any other boiler.

Modern high efficiency unit boilers are the stainless steel condensing boilers with its built-in heat exchanger to provide hot water to a home or a building. During the cold season, combi boiler runs when needed to heat the structure and provide hot water to various hot appliances. Whereas in hot summer days, combi boiler works whenever there is a need for domestic hot water. It usually takes the water from the main supply and results in stronger water pressure. It provides you plenty of hot water. Thus, no longer waits for the tank to refill again and again.


Types of combi boilers

Oil combi boilers – For the homes not connected with the gas networks, oil boilers is a good option. These boilers need an oil tank to be kept outside your home and once the oil is on the edge you need to top it up from the suppliers.

LPG combi boilers – LPG stands for Liquefied Petroleum Gas made with the combination of gaseous hydrocarbons. They are almost same as oil boilers as they also need a tank which is needed to refill once the gas is about to end.

Electric combi boilers – An electric combi boiler is slightly different from all the other combi boilers as they don’t require any tank or gas network. The water passes over an electric element in the hot cylinder which has an immersion heater. This is popular where the homes are not connected to the gas network or oil is too expensive to buy.

Gas combi boilers – Natural gas combi boilers are commonly used by the residents of UK. Also if your homes are connected with the gas network than this is the best choice for you in terms of keeping running costs down.

About heat exchanger

The heat exchanger is installed inside either the heating units or its purpose is to exchange heat and either air or water. There are different ways heat exchanger does this job. In a heat exchanger 2 elements can run together and simultaneously. But sometime the situation occurs that you need to replace the heat exchanger

There are several points which should be kept in mind while replacing the heat exchanger


When you are working with a boiler or a furnace, you need to undergo certain precautions. Accidentally puncturing of a pipe can cause a ray stream bellowing toward you. This can cause you severe damage. Therefore, prior to the heat exchanger you should turn the electric off at the main breaker. Be sure about wearing the work gloves as you have to work around the sharp edges and getting the cut.

Access to heat exchanger

Locate the screws on the boiler or furnace, you can find several sets of screws. Once the screws are removed, now you have to remove the metal penal.  The heat exchanger resembles a metal plate and will have the tubes coming off from it.

Replacing the heat exchanger

Before starting the replacement of the heat exchanger, always take an orientation of where everything is attached. Consult the manual of the new heat exchanger and make the adjustments with the fittings inside the boiler or the furnace.

Use the tools like screwdriver or wench to remove the fittings attached. Once they are removed, now you can pull off the heat exchanger. Now start replacing the fittings with the new heat exchanger. Once the new heat exchanger is placed you can replace the panels and turn the power on. The system will require the time to prime itself before operating.

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