unit 113 powerpoint 3 hot water

What is an instantaneous hot water system?

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Name the two types of instantaneous hot water systems mentioned in the image.

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Which of the following is not a category of instantaneous hot water systems?

• Simple hand wash heaters

• Electric showers

• Gas boilers

• Vented under-sink water heaters

What is the function of the heat exchanger in a multi-point heater?

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Fill in the blank: Cold water is taken from the water undertaker’s main and heated in a ______ before being distributed to the outlets.

• boiler

• refrigerator

• freezer

• microwave

Which of the following statements is true about multi-point heaters?

• They have a storage capacity.

• They can feed more than one tap or outlet.

• They do not deliver hot water as long as the tap is running.

• They have a poor flow rate.

What do combination boilers provide?

• Only hot water

• Only central heating

• Instantaneous hot water and central heating

• None of the above

In normal working mode, what do combination boilers supply to heat the central heating water?

• Full heat capacity

• A proportion of their available heat capacity

• No heat capacity

• External heat source

Fill in the blank: When a hot tap is opened, a diverter valve diverts boiler water around a second heat exchanger, which heats cold water from the water undertaker’s cold water mains to supply hot water at the ________.

• hot taps

• cold taps

• radiators

• boiler

Identify the part labeled 'Pressure switch' in the diagram of a combination boiler.

• Pressure switch

• Thermostat

• Heat exchanger

• Water pump