What is the most common cold water system in use in the UK?

• Unvented hot water system

• Direct cold water system

• Combination boiler system

• Indirect cold water system

In which type of cold water system is the kitchen sink the only appliance supplied with water directly from the water undertaker’s water main?

• Unvented hot water system

• Indirect cold water system

• Combination boiler system

• Direct cold water system

What is the main advantage of the direct cold water system installation?

• Reduced risk of contamination

• Reduced pressure at outlets and taps

• Reduced risk of water hammer and reverberation noise

• Good pressure at ALL cold water outlets

What is the main disadvantage of the indirect cold water system installation?

• Reduced risk of water hammer and reverberation noise

• Greater cost of installation

• Reduced pressure at outlets and taps

• Reduced risk of contamination

What is the typical pipe size used in direct cold water systems for small installations with a combination boiler supplying hot water and no en-suite bathrooms or shower rooms?

• 30mm

• 28mm

• 22mm

• 15mm

What is the typical pipe size used in direct cold water systems for installations with an unvented hot water storage system?

• 30mm

• 15mm

• 22mm

• 28mm

What is the typical pipe size used in indirect cold water systems for the cold distribution pipework feeding all other outlets except the kitchen sink?

• 30mm

• 22mm

• 28mm

• 15mm

What is the purpose of the cold water storage cisterns in the indirect cold water system?

• To increase the risk of frost damage of pipework and cisterns in the roof space

• To supply reserve water in the event of cold water mains failure

• To reduce the demand on the cold water main at times of peak demand

• To reduce the impact of leakage damage

What is the main advantage of using a 28mm rising main in direct cold water systems?

• Reduced risk of contamination

• Reduced pressure at outlets and taps

• Good pressure at ALL cold water outlets

• Reduced risk of water hammer and reverberation noise

What is the main disadvantage of using 22mm pipework in indirect cold water systems?

• Reduced risk of water hammer and reverberation noise

• Reduced risk of contamination

• Greater cost of installation

• Reduced pressure at outlets and taps