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The following text is for questions 11 to 15.
These days, increasing number of households use gas hot water systems, which mostly burn LPG (liquefied petroleum gas). It is a good solution if you live in an area with limited sunlight for a solar hot water system.
There are two main types of hot water systems. The first is storage water heaters, which heat and store water in an insulated tank for use when it is needed. The second is instantaneous systems (or continuous flow systems), which only heat water when it's needed and don't use a storage tank.
The second type is the most popular in the country, as it is more affordable. In instantaneous systems, the water is heated by a gas burner as it flows through a coiled pipe called a heat exchanger. The gas burner starts when a hot water tap is turned on. It only heats the amount of water that is required instead of continuously heating a full tank.
(Adapted from http://yourenergysavings.gov.au)
"... which heat and store water in an insulated tank for use when it is needed." (Paragraph 2)
The underlined word refers to ....
instantaneous hot water system
storage water heater
insulated tank
heated water
cold water
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