Hot Water Quiz

2.    What is the recommended temperature of the stored hot water, used for domestic purposes?

•    40°C – 45°C

•    60°C – 65°C

• 50°C – 55°C

•    70°C – 75°C

The correct connection position of the cold water feed pipe to the hot water storage cylinder is?

• On the top of the cylinder

•     1/3^rd down on the side of the cylinder

• 1/3^rd up on the side of the cylinder

•   Lowest point possible on the side of the cylinder

  The open safety vent pipe should not come straight up from the top of the hot water storage cylinder because?

•   Pressure at the hot water taps will be decreased

• Pressure at the hot water taps will be increased

• Hot water will flow directly through the safety vent, instead of the hot taps

• One pipe circulation will occur inducing heat loss from the stored hot water

The purpose of fitting secondary circulation to the hot water system is to?

 

• Act as an auxiliary hot water supply

• Prevent long dead legs

• Assist the circulation of the primary waters

• Aid the heating process

Which one of the following indicates an advantage of installing a stored system of hot water?

•   A reduced risk of mains contamination

•   A reduced installation space requirement

• Its suitability in areas with low water pressure

• It is less expensive to install

Which one of the following identifies a specific disadvantage of open vented hot water storage system?

• A greater installation cost

•   The absence of a hot water back-up supply

•    Variable hot water flow rate

• Plate heat exchanger scaling

The correct method of checking that the temperature sensing device in a thermostatic mixing valve is operating correctly is to?

• Disassemble the valve and clean it carefully

• Isolate the cold water supply and test the outlet water pressure

• Cap off the hot water supply and test the flow rate

• Take readings of the outlet water using a thermometer

In order to prevent wastage of water, “dead legs” should be which one of the following?

• As short as possible

• Within 10 m of the appliance

•    As long as possible

• Within 5 m of the appliance

When running a hot water distribution pipe through a wall it should be sleeved to?

• Allow for thermal expansion of the pipe

• Allow for thermal expansion of the wall

•   Make maintenance easier

• Allow for settlement of the building

  
  

Stratification of the hot water within the hot water storage cylinder will ensure that?

• The cylinder will continue to function correctly

• The life of the cylinder will be extended

• The sacrificial anode within the cylinder will function correctly

• The hottest water within the cylinder will be drawn off