WorksheetsMTL2 Hot Water Learner Outcome 6
Total questions: 15
Worksheet time: 8mins
Why should manufacturer’s instructions be used for servicing?
To make work faster
To follow correct and safe procedures
To avoid paperwork
To replace regulations
How often should gas-fired hot water heaters be serviced?
Every 6 months
Once a year
Every 2 years
When they stop working
Who can legally service gas appliances?
Any plumber
A Gas Safe registered engineer
A DIY homeowner
A building inspector
What does a sacrificial anode protect against?
Limescale
Air locks
Corrosion inside the cylinder
Overheating
What is a sacrificial anode usually made of?
Copper
Zinc
Magnesium
Aluminium
What is a sign of cylinder corrosion or limescale?
Clear water flow
White deposits or reduced flow rate
Low noise
No heat
The sound of “kettling” in a heater means:
Water is cold
The element is new
Local boiling due to scale build-up
Pump is too small
TMVs and thermostatic showers should be checked for:
Paint damage
Label condition
Correct temperature and flow
Tap colour
What device stops circulation to the cylinder coil when temperature is reached?
Pump
Diverter valve
Motorised zone valve
Drain-off valve
What should be checked on electrical thermostats?
Water level
Secure wiring and correct operation
Vent pipe position
Pipe colour
What must you do before servicing a hot water cylinder?
Increase temperature
Isolate electric, gas and water supplies
Open all valves
Drain heating first
Why record servicing details?
For decoration
It’s optional
For safety, warranty, and maintenance history
To check customer payment
What information goes on a maintenance record?
Customer age
Date, engineer name, system type, and work done
Appliance colour
Floor area of house
What could cause slow water heating?
Wrong tap type
Limescale blocking the coil or heater
Pump too fast
Cylinder too small
What should always be done after a service?
Leave isolation valves open
Check system operation and leaks
Overheat the water
Drain the system again
