Here is an example question from a C&G 6084 Level 3 assessment. I wonder who might get 'referred' on this? This is a required qualification for all who may self-certify Part L compliance. What is the main characteristic of a combi boiler?
a) It provides instant hot water at mains pressure. b) The heating goes off when a hot tap is opened. c) It produces more hot water than a regular boiler. d) Two boilers can easily be combined for more hot water.