306 Hot water systems 3 Quiz

Which of the following cylinder types is a direct cylinder?

• A

• B

• C

State the minimum size of open vent pipe which terminates over a cold water storage cistern that is allowed under the Water Regulations for a secondary domestic hot water system.

• 15mm

• 22mm

• 28mm

• 32mm

What is the recommended temperature setting for the thermostat to an immersion heater in a hot water storage cylinder?

• 90°C

• 70°C

• 60°C

• 50°C

Which type of hot water storage cylinder is shown in this diagram?

• Direct cylinder

• Combination unit

• Double feed indirect cylinder

• Single feed indirect cylinder

A hot water storage cylinder heated by an immersion heater only is considered to be what type of hot water storage system?

• Direct

• Indirect

• Electrolytic

• Instantaneous

When water is heated in a hot water storage cylinder, stratification will occur. Which of the following best describes stratification?

• The hottest water is in the middle of the cylinder; the coldest water is at the top and bottom of the cylinder

• The coldest water is at the top of the cylinder and the hottest water is at the bottom of the cylinder

• The coldest water is in the middle of the cylinder; the hottest water is at the top and bottom of the cylinder

• The hottest water is at the top of the cylinder and the coldest water is at the bottom of the cylinder

The recommended minimum size of primary circulation pipework between a small (under 35kW) solid fuel boiler serving a direct hot water cylinder only is:

• 15mm

• 22mm

• 28mm

• 35mm

What is the electrical power rating of a typical domestic immersion heater?

• 3kW

• 3.7kW

• 4kW

• 10kW

The difference between a single feed and a double feed indirect cylinder is:

• the single feed cylinder requires a booster pump

• the single feed cylinder does not need a separate feed and expansion cistern

• the single feed cylinder requires a twin port motorised valve arrangement

• the single feed cylinder does not require an open vent pipe to the secondary storage cistern

The following diagram shows an indirect hot water system. Which section of pipe is missing from the diagram?

• Primary cold feed pipe

• Primary open vent pipe

• Secondary cold feed pipe

• Secondary open vent pipe