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.

This

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diagram provides an overview of a domestic central heating system. It shows how the tank,

boiler

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and pipes ensure a constant flow of hot

waterto

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water to

both the

radiators

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and the taps. The cold

water

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enters the

house

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and is stored in a

water

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storage tank

in

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on

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the roof. From there ü flows down to the

boiler

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, located on the ground floor of the

house

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. The

boiler

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, which is fuelled by gas or oil, heats up the

water

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as it passes through it. The hot

water

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is

then

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pumped round the

house

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through a system of pipes and flows into the

radiators

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, located in different rooms. The

water

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circulates through the

radiators

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, which have small tubes inside them to help distribute the heat, and

this

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warms each of the rooms. Some of the

water

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is directed to the taps to provide hot

water

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for the

house

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. Once the

water

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has been through the pipes and

radiators

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, it is returned to the

boiler

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to be re-heated and circulated

round

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around

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the

house

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again.