Domestic Hot Water Systems Quiz

Lilly and George are studying the open vented system in their Plumbing class. They have learned that the open vent has a primary function. What is it?

• To increase the pressure in the system

• To control the flow of hot water

• To act as a safety relief valve in case of overheating

• To regulate the temperature of the hot water

What is the minimum size of the open vent according to BS6700?

• 24mm

• 20mm

• 18mm

• 22mm

In a direct hot water cylinder system using a boiler, how is the water heated?

• By a chamber within the cylinder

• By a heat exchanger coil

• By an immersion heater

• Directly by the boiler

What is the purpose of the F&E cistern in a double feed system?

• To feed down to the hot water cylinder

• To act as a safety relief valve

• To top up the primaries with water

• To control the flow of cold water

What is the recommended minimum distance from the exit of the cylinder to the open vent tee to prevent one pipe circulation?

• 300mm

• 450mm

• 350mm

• 400mm

What is the primary flow and return pipework size in a direct or indirect open vented system?

• 20mm

• 18mm

• 22mm

• 24mm

What is the heat-up time for high heat recovery cylinders under part L?

• 30 minutes

• 25 minutes

• 20 minutes

• 15 minutes

What is the primary function of the vent pipe in an open vented system?

• To increase the pressure in the system

• To act as a safety relief valve in case of overheating

• To regulate the temperature of the hot water

• To control the flow of hot water

What is the minimum size of the cold feed according to BS6700?

• 20mm

• 22mm

• 24mm

• 18mm

What is the purpose of the CWSC in an open vented system?

• To increase the pressure in the system

• To act as a safety relief valve

• To store mains water and feed down to the hot water cylinder

• To top up the primaries with water