A Combi boiler heats domestic hot water on demand, removing the need for the hot water storage cylinder and cold water storage tanks that are required in a concentrional hot water system. They usually have a sealed central heating system i.e. the circulating water is topped up by means of a tap, hose and valve known as a filling loop. There is no requirement for a tank to supply the central heating system, and the expansion as the water heats is absorbed by a vessel in the system.
Pressure in the system may fluctuate in use, usually between 1 and 2.5 bar. If the pressure exceeds 3 bar, a safety device discharges excess water. Modern combi boilers can deliver a high flow of hot water if they are sized correctly, but are not always the best solution for hot water, especially in larger properties. These systems have a boiler and a pump which circulates hot water around radiators that give out heat to warm your home.
Some of the circulating water may be diverted to warm the stored hot water which is kept in a cylinder.
Pressure in the system may fluctuate in use, usually between 1 and 2.5 bar. If the pressure exceeds 3 bar, a safety device discharges excess water. Modern combi boilers can deliver a high flow of hot water if they are sized correctly, but are not always the best solution for hot water, especially in larger properties. These systems have a boiler and a pump which circulates hot water around radiators that give out heat to warm your home.
Some of the circulating water may be diverted to warm the stored hot water which is kept in a cylinder.
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