How Does a Combi Boiler Work?


A combi boiler is a high-efficiency water heater and a central heating system that provides heating and hot water directly from the boiler. Combo boilers save on hot water and are ingenious space-saving idea. They report well over half of all the new domestic boilers installed in Britain every year.
7 Additional Answers
Combi boilers are designed to heat water up instantly for domestic as well as provide heat into the central heating system. Upon a signal from the room thermostat for the boiler to fire up the central heating system. The water starts flowing passing through a narrow gap in the pipe creating a pressure difference and causes the gas valve to open. Gas is ignited in the main burner. The heat exchanger holds a limited amount of water, which is rapidly heated up and circulated around the boiler through the heat exchanger. When the water temperature reaches 60c the thermostatic element expands, the hot water system valve closes, the heating system valve opens, which allows water to flow to the central heating system.
A combi boiler works through a series of processes. When a signal is sent to the from the room thermostat for the boiler to fire up the central heating system the pump in the boiler fires up and the water starts passes through a narrow pipe creating pressure differential and cause the valve to open. The burner is ignited and when the water temperature 60 °c, the hot water valve closes and the heating system opens allowing water in the central heating system.
A combi boiler is a highly efficient water heater and central heating boiler combined in a single unit. Water is heated on demand from within the unit itself. The process of condensation in the case of a combi boiler is highly efficient and is a very popular choice of domestic and household boilers in the United Kingdom. A combi boiler is different from other boilers in the sense that there is no need to store hot water in a combi boiler. Hence it saves space in the airing cupboard.
When a signal from the room thermostat is received by the combi boiler, the pump inside fires up and water starts flowing through a narrow gap in the pipe causing the gas valve to open. The gas is ignited in the main burnerand the water is heated in the heat exchanger. When water temperature reaches 60°C, the hot-water system valve closesand the heating system valve opens.
When looking for a combi boiler there are factors that need to be considered, they include: its heat output, its secondary heat exchanger, its condensing position and its water reservoir. A majority of combi boilers are oversized: this enhances moderate hot water flow rates.
When you switch on the Combi Boiler, a signal is sent from the thermostat to fire up the boiler. Water flows through a narrow gap in the pipe creating a pressure differential that opens the gas valve. Next, gas is ignited in the main burner and a small amount of water in the heat exchanger is heated up and circulated around the boiler. When the water temperatures reach 60 degrees Celsius, the thermostat expands and the system valve opens to allow water to flow through the heating system.
Combi boilers cost anywhere between £200 and £1,000. Boilers range in price depending on whether they are gas boilers, electric boilers or solar powered boilers. Combi boilers provide heating and hot water directly from the boiler.
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