Ph 1 Hot Water PP1 pt 2

What does a direct hot water cylinder use to heat water?

• An internal coil as a heat exchanger

• Solar panels

• Electricity only

• A boiler without a heat exchanger coil in the cylinder

What is the purpose of a baffle installed in some hot water cylinders?

• To generate more heat

• To prevent incoming cold water from mixing with the hot water

• To increase water pressure

• To reduce the temperature of the water

Where is the cylinder stat typically placed in a hot water cylinder?

• At the bottom

• One-third of the way up the cylinder

• At the top

• Halfway up the cylinder

What is the rating of domestic immersion heaters?

• 5kW

• 2kW

• 3kW

• 4kW

What is a characteristic feature of an indirect hot water system?

• It has no form of heat exchanger or coil

• It directly heats water through electrical means only

• It uses solar panels as the primary heat source

• It has an internal coil acting as the heat exchanger

What is the common size for immersion heaters?

• 11'' and 18''

• 27'' and 14''

• 22'' and 28''

• 30'' and 36''

What is a feature of combination units in hot water systems?

• They use external heat exchangers

• They combine the cylinder and cold water storage cistern

• They are primarily used in large commercial buildings

• They require complex plumbing

What is the effect of temperature stratification in hot water cylinders?

• It makes the water boil

• It creates a temperature difference between the top and bottom

• It increases the water pressure

• It causes the water to freeze

What safety feature is required in all immersion heaters installed today?

• A reset button or cut-out device

• A solar panel connector

• An automatic shut-off valve

• A digital thermostat

What is the recommended temperature setting for the thermostat to an immersion heater in a hot water storage cylinder? 

• 50

• 60

• 70

• 90