Worksheets306 Hot water systems 3 Quiz
Total questions: 18
Worksheet time: 14mins
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
What type of cylinder is shown below?
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
An unvented cylinder has a range of safety controls to prevent hot water reaching which temperature?
85°C
90°C
95°C
100°C
Which system works in a similar way to an indirect cylinder, except in reverse?
Unvented cylinder
Thermal store unit
Direct cylinder
Combination unit
What type of boiler provides instantaneous hot water to multiple outlets, as well as central heating, and is known as a hot water priority system?
Condensing boiler
Electric boiler
Combination boiler
Combination cylinder
Name the hot water appliance which is commonly used to provide hot water to a remote basin/sink, which is located too far away from a DHW storage vessel.
Gas or electric single point heater
Smaller DHW storage vessel
Combination cylinder
Secondary circulator
A plastic feed and expansion cistern must be:
fully supported across its entire base
supported on a single beam
supported on at least two beams
rested on a first-floor plasterboard ceiling
Select the correct name for the pipework's labelled 1–4 in the diagram below.
1 primary open vented pipe, 2 Primary cold feedpipe,
3 Secondary Open vent pipe,
4 Secondary cold feed pipe
1 Secondary open vent pipe
2 Secondary cold feed pipe
3 Primary open vent pipe
4 Primary cold feed pipe
1 Primary Return pipe
2 primary flow pipe
3 Secondary Return pipe
4 Secondary flow pipe
1 Secondary Return pipe
2 Secondary Flow pipe
3 Primary return pipe
4 Primary flow pipe
