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What is the primary function of an unvented hot water system?

• To store cold water

• To provide hot water at mains pressure

• To reduce water pressure

• To filter water

An unvented hot water system is designed to operate at ________ pressure.

• low

• mains

• variable

• high

What are the advantages and disadvantages of hot water systems?

• Energy efficient

• High installation cost

• Requires regular maintenance

• All of the above

Identify the typical pipe sizes used in hot water systems within dwellings: A) 15mm B) 22mm C) 28mm D) 35mm. Fill in the blank: The most common pipe size is ____.

• 15mm

• 22mm

• 28mm

• 35mm

What is an unvented hot water system?

• A system using a cold water storage cistern

• A sealed system supplied with water above atmospheric pressure

• A system with an open vent pipe

• A system without mechanical safety devices.

An unvented hot water system is different from an open vented system because it does not have a ______.

• booster pump

• cold water storage cistern

• open vent pipe

• mechanical safety device

What should be considered regarding the available pressure and flow before installing an unvented hot water system?

• It affects the system's performance

• It is not important

• It should be ignored

• It is only relevant after installation.

Before installing an unvented hot water system, the route of the discharge pipework, termination, and pipe size should be considered because ______.

• it is irrelevant

• it affects the system's efficiency

• it is only for aesthetic purposes

• it is a legal requirement

Why is it important to consider the type of terminal fittings used in unvented hot water systems?

• All taps and fittings are suitable

• Not all taps and fittings will be suitable

• It is only a minor consideration

• It does not affect the system.

What are the two types of unvented hot water cylinders according 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 dual expansion bubble.

• Cylinder using a plastic expansion vessel and cylinder incorporating a metal expansion bubble.