The diagram below shows how a central heating system in a house works. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The given picture illustrates how a central heating system operates in a typical house in order to keep the internal climate and tap

water

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at a pre-set

temperature

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. The process runs through two stages, starting at a transitory state until reaching a steady state. In the transitory stage, the main goal is to fill the heater´s piping circuit with

water

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.

Initially

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, cold

water

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is taken from the local

water

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utility supplier and passed through a boiler, which is a device designed to exchange energy between burned fuel (gas or oil) and

water

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,

this

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fluid is

then

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pumped through some tubes and radiators, which are equipment used for exchanging

temperature

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between the running fluid and the air inside the house.

Finally

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,

water

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reaches back to the boiler. The amount of

water

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taken from the utility service has a specific volume

according to

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an engineering design,

this

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stage continually repeats until the

water

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gets a predefined

temperature

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. Once the system has reached the pre-set

temperature

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,

that is

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when it gets to a steady state, thanks to the high pressure on the piping circuit,

water

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is transported to a storage tank from the boiler, after the storage tank is completed,

water

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runs down to a sink and when the pressure again is high enough,

water

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deviates towards a spare

water

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tank which functions as a

water

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reserve for when the service is interrupted.