Hot water revision level 2

The recommended minimum diameter for gravity circulation pipework, between the boiler and hot water storage cylinder in a direct hot water system, is

• 22mm

• 15mm

• 28mm

• 35mm

The minimum capacity recommended by British Standard 6700 for a cold water storage cistern, that is feeding all outlets in a dwelling (both hot and cold) is

• 380 litres

• 450 litres

• 400 litres

• 200 litres

What type of service valve is usually fitted to the cold feed pipe to a hot water storage cylinder?

• Spherical plug valve.

• Full way gate valve.

• Non-return valve

• Supply stop valve

Which one of the following plastic pipe materials is usually used for domestic hot and cold supply and distribution water pipework?

• Acrylonitrile Butadiene Styrene (ABS).

• Polypropylene copolymer (PP)

• Polybutylene

• Unplasticised polyvinyl chloride (PVC – U).

Which one of the following should be positioned in either the bottom of the hot water storage cylinder, or in the cold feed pipe to the storage cylinder?

• 
• 
• 
• 

Hydraulic test procedures for rigid pipework systems routinely requires a standing period to

• Allow the water in the system to get into any dead ends of pipework

  .

• Allow all air within the system to reach the highest point within the system

• Permit the indicator needle on the test equipment pressure gauge to settle down

• Allow all water and pipework to reach the ambient temperature

Which one of the following requires that domestic hot water systems have insulated components?

• British Standard 5440.

• Building Regulations.

• Construction Regulations.

• Control of Substances Hazardous to Health Regulations

Unprotected copper pipe is most likely to corrode

• In an airing or cylinder cupboard

• In a fireback arrangement to a solid fuel boiler

• Under insulation in a roof space where air cannot circulate

• When jointed to plastics

A temperature sensing cartridge can be found in

• a shower mixer valve

• An electric immersion heater for a hot water storage cylinder

• A screened warning pipe assembly for a storage and feed cistern

• A pressure reducing valve

Check valve assemblies can be an integral part of a

• horizontal electric immersion heater

• Thermostatic shower valve

• Cylinder thermostat

• Fullway gate valve.