WorksheetsMTL2 Hot Water Learner Outcome 4
Total questions: 25
Worksheet time: 13mins
What tool measures water pressure?
Thermometer
Pressure gauge
Tape measure
Flow cup
What tool measures flow rate?
Spirit level
Multimeter
Flow cup or jug and stopwatch
Gas tester
Why is temperature testing of hot water important?
To check colour
To clean the pipes
To prevent scalding and legionella
To test pressure
Where should a hot water storage cylinder usually be installed?
Loft
Central position, often in an airing cupboard
Bathroom
Garage floor
A hot water cylinder base should be:
Uneven
On carpet
Flat, level, and strong enough to hold full weight
Made of wood only
A drain-off valve should be fitted:
At the top of the cylinder
At the lowest point of the cold feed pipe
On the vent pipe
After the TMV
The gate valve on the cold feed should be fitted:
Below the drain
Above the cylinder, below the cistern
After the expansion pipe
At the tap outlet
Which material expands the most with heat?
Copper
Steel
Plastic (PB or PE)
Brass
What can happen if expansion in plastic pipes isn’t allowed?
Water stays still
Pipe buckles or joints pull apart
Pipes get colder
Flow increases
What helps control expansion and contraction in long pipe runs?
Tight clips
Loops or changes of direction
Sealed joints
Extra insulation
Where must expansion bellows or flexible hoses be installed?
Buried under floors
In accessible positions for inspection
Inside walls
At the stop tap only
What is the typical pipe size for a primary circuit in domestic properties?
10 mm
15 mm
22 mm or 28 mm depending on design
35 mm
What does the VCP rule stand for in open vented systems?
Valve / Coil / Pump
Vent / Cold Feed / Pump
Volume / Circulation / Pressure
Vertical Cylinder Pipe
What should the minimum insulation thickness be on 15 mm hot pipework?
10 mm
20 mm
26 mm
35 mm
What must be done to any pipework outside heated areas?
Paint it
Insulate it
Leave it exposed
Use copper only
A hot water vent pipe must never have:
A bend
An elbow
Any isolation valve
A clip
Hot water pipes connected to a cylinder must be insulated:
Only on the flow pipe
Only when near windows
For at least 1 metre from the cylinder
Only if visible
Factory-sprayed cylinder insulation should be at least:
20 mm thick
30 mm thick
50 mm for new build
75 mm
When installing a TMV, the pipe from the valve to the tap should be:
Long
As short as possible
In plastic only
Vertical only
A pumped primary circuit normally uses what size pipe?
10 mm
22 mm
35 mm
50 mm
What pipe size is used for a gravity primary flow?
15 mm
28 mm
35 mm
10 mm
Why should cistern lids always be fitted?
For decoration
To prevent contamination
To increase flow
To reduce noise
What connects the cold feed cistern to the hot water cylinder?
Overflow pipe
Cold feed pipe
Vent pipe
Return pipe
What type of clip spacing should be used for hot water pipes?
Random
As few as possible
According to pipe size and manufacturer’s guidance
None if hidden
What should always be used to isolate water before maintenance?
Plug in tap
Service valve or gate valve
Check valve
Drain cap
