MODEL ANSWER:
This diagram provides an overview of a domestic central heating system. It shows how the tant boiler and pipes ensure a constant flow of hot water to both the radiators and the taps.
The cold water enters the house and is stored in a water storage tank in the roof. From there n flows down to the boiler, located on the ground floor of the house.
The boiler, which is fuelled by gas or oil, heats up the water as it passes through it. The hot water is then pumped round the house through a system of pipes and flows into the radiators, located in different rooms. The water circulates through the radiators, which have small tubes inside them to help distribute the heat, and this warms each of the rooms. Some of the water is directed to the taps to provide hot water for the house.
Once the water has been through the pipes and radiators, it is returned to the boiler to be re- heated and circulated round the house again.
Introduction: First sentence. Overview: Second sentence. egta wolh
Key features: Entry of cold water into boiler: circulation of hot water to radiators and taps; return of water to boiler.
Supporting information: direction of flow; types of boiler; location of radiators; radiator tubes
Paragraph breaks: The paragraph breaks mark stages in the process.
Linkers: and, from there, then, once, again Reference words: it, both, there, which, this
Topic vocabulary: enters, stored, roof, flows, ground floor, located, passes, pumped, system, circulates, heat, directed, returned, re-heated
Less common vocabulary: ensure, fuelled by, heats up, distribute the heat, warms Structures: An appropriate mix of active and passive
structures and a range of sentence types are used.
Length: 172 words
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