Unvented Hot Water System Quiz

What is an unvented hot water system?

• A system that uses a cold water storage cistern.

• A sealed hot water system of pipework and components supplied with water above atmospheric pressure.

• A system that has an open vent pipe.

• A system that does not require mechanical safety devices.

How is an unvented hot water system fed?

• By an open vent pipe.

• By a cold water storage cistern.

• Directly from the mains supply, by booster pump or accumulator.

• By a manual pump.

What is used to accommodate the expansion of heated water in an unvented hot water system?

• An open vent pipe.

• A cold water storage cistern.

• An external expansion vessel or an internal expansion bubble.

• A manual pump.

What additional components are required for the safe control of expansion and temperature in an unvented hot water system?

• Cold water storage cisterns.

• Open vent pipes.

• Mechanical safety devices.

• Manual pumps.

Before installing an unvented hot water system, what should be considered regarding the available pressure and flow?

• It should be ignored as it does not affect the system.

• It should be checked after installation.

• Readings should be taken prior to installation at peak demand periods.

• It should be considered only if there is a problem.

Why is it important to consider the route of the discharge pipework, termination, and pipe size before installing an unvented hot water system?

• To ensure the system is aesthetically pleasing.

• To ensure the system performs efficiently.

• To reduce the cost of installation.

• To avoid the need for terminal fittings.

What should be considered about the type of terminal fittings used in an unvented hot water system?

• All taps and fittings are suitable.

• Only the cheapest fittings should be used.

• Not all taps and fittings will be suitable.

• The fittings should be installed after the system is operational.

Why is the cost an important factor to consider before installing an unvented hot water system?

• Because these systems are inexpensive to install.

• Because these systems are expensive to install.

• Because the cost does not affect the installation.

• Because the cost is only relevant after installation.

What are the two types of unvented hot water cylinders manufactured to BSEN12897:2006?

• Cylinder using an external expansion vessel and cylinder incorporating an internal expansion bubble

• Cylinder using an internal expansion vessel and cylinder incorporating an external expansion bubble

• Cylinder using a single expansion vessel and cylinder incorporating a double expansion bubble

• Cylinder using a high-grade duplex stainless steel and cylinder incorporating a low-grade duplex stainless steel

What material are most unvented hot water cylinders made from for strength and corrosion resistance?

• High grade duplex stainless steel

• Low grade duplex stainless steel

• High grade carbon steel

• Low grade carbon steel