1
Hot water Questions and Correct
Answers Latest Update 2026-2027.
Graded A
A Direct cylinder has no - ANSHeat exchanger (coil)
The water is heated from the boiler. Or immersion heater
A hot water system that includes a cold water storage cistern and
expansion cistern is a double feed indirect - ANS
A small leak is found on a soldered joint on the hot water distribution pipe
from a hot water storage vessel. What action should be taken? - ANSDrain
system down and add leak sealer wrong it's drain down the system and re
solder the fitting
A tundish - ANSprevent cross-contamination between an overflow pipe and
a drain pipe
Needs to be a maximum of 500mm
After repairs or extensions to an existing hot water system, the installation
is normally checked for leakages at the normal working pressure - ANS
After the removal of a CWSC in an occupied property. A plumber needs to
temporarily leave the site. What is the main safety precaution that must be
1
, 2
taken before leaving the job? - ANSMake sure the system is isolated and
cannot be refilled
An open vent pipe must not be smaller than 22mm - ANS
An open vented hot water storage system is directly heated with a single
thermostat immersion heater. Extremely hot water is discharging from the
open vent to the CWSC WHAT ACTION SHOULD BE TAKEN TO
REMEDY THE SITUATION? - ANSReplace the immersion heater with a
single thermostat immersion heater
Before decomposing of a hot water storage vessel the customer should be
advised off the estimate length of time the system will be out of service -
ANS
Before filling up of a newly installed hot water storage vessel, it is
recommended that the installer visually inspects the pipe work and fittings -
ANS
Before making a final connections to a shower mixer valve, it is important
that all pipework is flushed to remove flux and Debris - ANS
Before the draining down and removal of hot water cylinder located in an
airing cupboard what will help speed up this process? - ANSLiaise with
customers before starting the work and ask for items to be removed from
the Work area.
2
Hot water Questions and Correct
Answers Latest Update 2026-2027.
Graded A
A Direct cylinder has no - ANSHeat exchanger (coil)
The water is heated from the boiler. Or immersion heater
A hot water system that includes a cold water storage cistern and
expansion cistern is a double feed indirect - ANS
A small leak is found on a soldered joint on the hot water distribution pipe
from a hot water storage vessel. What action should be taken? - ANSDrain
system down and add leak sealer wrong it's drain down the system and re
solder the fitting
A tundish - ANSprevent cross-contamination between an overflow pipe and
a drain pipe
Needs to be a maximum of 500mm
After repairs or extensions to an existing hot water system, the installation
is normally checked for leakages at the normal working pressure - ANS
After the removal of a CWSC in an occupied property. A plumber needs to
temporarily leave the site. What is the main safety precaution that must be
1
, 2
taken before leaving the job? - ANSMake sure the system is isolated and
cannot be refilled
An open vent pipe must not be smaller than 22mm - ANS
An open vented hot water storage system is directly heated with a single
thermostat immersion heater. Extremely hot water is discharging from the
open vent to the CWSC WHAT ACTION SHOULD BE TAKEN TO
REMEDY THE SITUATION? - ANSReplace the immersion heater with a
single thermostat immersion heater
Before decomposing of a hot water storage vessel the customer should be
advised off the estimate length of time the system will be out of service -
ANS
Before filling up of a newly installed hot water storage vessel, it is
recommended that the installer visually inspects the pipe work and fittings -
ANS
Before making a final connections to a shower mixer valve, it is important
that all pipework is flushed to remove flux and Debris - ANS
Before the draining down and removal of hot water cylinder located in an
airing cupboard what will help speed up this process? - ANSLiaise with
customers before starting the work and ask for items to be removed from
the Work area.
2
