Hot Water Systems 1.1 part 3Quiz

What is the purpose of the mixing valve on a thermal store?

• To mix the hot water with cold water so that it doesn’t exceed 65oC

• To store hot water for later use

• To decrease water temperature

• To increase water pressure

What principle do gas instantaneous hot water heaters use?

• Pressure difference

• Gravity flow

• Thermal expansion

• Chemical reaction

Why should only one tap be used at any one time with instantaneous gas water heaters?

• There is not enough flow rate for more than one tap

• To maintain water pressure

• To prevent overheating

• To conserve water

Which type of heat exchanger heats the water on a combi boiler?

• Plate heat exchanger

• Regenerative heat exchanger

• Double pipe heat exchanger

• Shell and tube heat exchanger

How much storage do some combi boilers contain?

• Around 15 litres

• Around 20 litres

• Around 10 litres

• Around 5 litres