This is popular because in most kitchen floor space is at a premium. They are similar to free standing boilers but and light enough to be fixed to a wall and do not have to rest on the floor. Most wall mounted boilers now are fan assisted, there balanced flue models both are room sealed and the open flue version is not available.
Wall mounted boilers are also know as low-water content boilers because the heat exchanger in them have very little capacity, there some with cast iron heat exchanger, which can hold reasonable water capacity. Because of the low water content their heat exchanger can easily overheat, hence high flow rate of water through the boiler must be maintained. A wall mounted boiler is not suitable gravity central heating system or gravity hot water system.
It is common to hide them in a kitchen cupboard, although the room sealed boiler does not need air from the room to burn, do not fill the space in the cupboard the boiler need air circulation to prevent over heating. This is known as boiler compartment ventilation.
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