Hot Water Systems Quiz

Which one of the following hot water components should be fixed using flexible connections?

• Indirect hot water cylinder

• Shower mixer valve

• Booster pump for a shower

• External bib tap.

A rigid pipework hot water system has a working pressure of 4bar. At what pressure should the pipework be tested for soundness?

• 1bar for 60 minutes

• 1½ times the working pressure for 15 minutes

• 6bar for one hour

• 4bar for 30mins then 6bar for 15 minutes.

To prevent electrolytic corrosion taking place in a system, where can the magnesium rod be placed?

• The cold water storage cistern

• The hot water cylinder

• The circulator

• The open vent.

Guidance on the installation procedures for domestic hot water systems can be found in:

• Domestic Water Act 2007

• Specification of work

• BS6700

• Local Authority Regulations.

In a customer's property, the CWSC supplies both the hot and cold water systems. The minimum size of this cistern is:

• Equal to 48 hours' worth of water

• 230 litres

• 100 litres

• Twice the size of the domestic hot water cylinder

Which of the following appliances is most likely to offer the customer low pressure at a hot water outlet?

• Combination boiler

• Direct cylinder

• Combination unit

• Indirect cylinder

What is this item?

• Pressure/temperature relief valve

• Double check valve

• Stop valve

• Blending valve

If hard water is allowed to be heated above 65°C, what could be the consequence in the system?

• Legionella could grow

• The blending valve would fail to work

• The pressure relief valve would open

• The efficiency could be affected by limescale

To overcome a dead leg for a hot water draw-off point, what course of action could be taken?

• Install secondary circulation

• Install a more powerful circulator

• Increase the size of the hot water cylinder

• Increase the temperature on the cylinder thermostat

A customer has intermittent flow of hot water from their bath tap – what is the most likely cause of the problem?

• Too little head pressure

• Too much head pressure

• Air lock

• Faulty float operated valve