WorksheetsMTL2 Hot Water Learner Outcome 8
Total questions: 15
Worksheet time: 8mins
What does decommissioning mean?
Installing new pipework
Cleaning taps
Taking a system out of use
Adding more pressure
Why might a system be temporarily decommissioned?
To save energy
For maintenance or repair
For decoration
To add new pipework only
Before any decommissioning, you must first:
Paint the area
Inform the customer or other people on site
Remove tools
Take photos
What must be done to electrical components before work starts?
Turn them on
Test voltage
Isolate the electrical supply
Cover them in water
What is a good way to reduce isolation time for the customer?
Work slower
Prepare all materials before shutting off water
Keep valves open
Turn off all systems early
Why should customers store some water before isolation?
To water plants
So they have drinking and washing water available
To fill the cistern
To test flow rate
What should be placed on the stop tap or valve when isolating?
Price tag
Tape
Warning notice – 'Do not turn on'
String
During temporary decommissioning, what happens to the water?
It’s heated
It’s drained from the part being worked on
It’s coloured
It’s reused
What’s the first step in permanent decommissioning?
Refill the system
Isolate the main water supply
Install a pump
Turn on immersion heater
When permanently removing pipework, you should:
Leave pipes open
Reconnect to taps
Cap off at the nearest live connection
Bend the ends over
Why should pipes be capped after removal?
To hold pressure
To prevent stagnation or contamination
To make them look tidy
To support new pipes
After draining a cylinder, what should you do next?
Leave it full
Reconnect mains supply
Disconnect electrical and control components
Add anti-freeze
What should be done with removed cylinders and pipework?
Leave on site
Dispose of safely and legally
Store in roof space
Return to system
Why is communication with the customer important during decommissioning?
To sell more parts
To speed up work
So they understand the duration and impact
It’s not important
What should be left after permanent decommissioning?
An open valve
A full cistern
A notice stating the system has been decommissioned
A spare thermostat
