Hot water quick quiz

The purpose of the fitting is to

• Provide a method of releasing high pressure in the system

• Isolate the incoming cold water supply pipe from the mains

• Isolate the cold supply to the hot water storage cylinder

• Prevent the back flow of contaminated water into the mains

The usual minimum permissible head, from the base of a cold water storage cistern to the shower rose position, for a low pressure shower mixer is NOT

• 1000mm

• 1m

• 100cm

• 100 inches

The purpose of a double check valve on a mains fed shower is to

• Prevent air locks

• Reduce outlet pressure

• Prevent backflow

• Reduce inlet pressure

The recommended position for distribution pipe connections from a cold water storage cistern is

• In the base of the cistern as low as possible

• The centre of the top cover

• In the side wall at a height of 150 mm

• In the side wall at a height of 65 mm

The correct method of isolating a water-jacketed tube heater from the cold water supply pipe,is to use a

• Fullway gate valve

• Non-return valve

• Supply stop valve

• Servicing valve

The purpose of allowing ‘standing time’ when carrying out hydraulic tests on hot water systems, is to allow the

• Water temperature to stabilise

• Air to exit the system via the vent

• Test pressure to reach it’s maximum

• Plumber to check for water leaks

The most efficient way of isolating and draining the hot water supply to a bath tap is to turn off the service valve to the

• Cold water distribution pipe and drain through the bath tap

• Float valve at the CWSC and drain through the bath tap

• Cylinder cold feed pipe and drain through drain valve on the cylinder

• Cylinder cold feed pipe and drain through the bath tap

The safest method of ensuring that a boiler connected to a hot water storage vessel cannot be re-activated during a period of de-commissioning, is to

• switch off the supply to the boiler at the fused spur socket outlet, tape the switch and carry on with the work

• contact the power supply company to advise that the power is being turned off and isolate the

  supply at the consumer unit by removing the fuse

• isolate the boiler from the electrical supply by turning off all the power at the mains, disconnect the boiler and tape the wires up

• isolate the boiler from the electrical supply at the consumer unit, remove and retain the fuse, and check for safe isolation.

In order to replace a hot water storage cylinder, the cylinder has been isolated at the service valve on the cold feed. The best position to place a warning notice to advise that the service valve should not be opened is at the

• Cylinder cupboard door

• Actual work location

• Entrance to the dwelling)

• Supply stop valve.

A record of permanent decommissioning is required for

• One-off domestic dwelling

• Work in industrial/ commercial premises

• Multi-dwelling housing contracts

• Temporary site buildings