GMJ 9189 Phase 1 unit 306

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

• 110mm

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

• 50ºC

• 60ºC

• 70ºC

• 84ºC

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

• Direct cylinder

• Primatic Cylinder

• 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

• Primatic

• 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

• 110mm

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

• 3kW

• 3.7kW

• 4kW

• 7.5kW

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

What type of cylinder is shown in the picture?

• Single feed indirect cylinder

• Direct cylinder

• Combination cylinder

• Unvented cylinder

Where should the primary open vent pipe in a double feed indirect hot water system terminate?

• Over the cold water storage cistern

• Over the feed and expansion cistern

• To the outside of the property

• In an expansion relief valve