To limit the probability that
- designs with a large demand for combined service water
heating and space-heating will use a combination system, which could
lead to inefficient equipment and systems, or
- combination systems will be used where the space-heating
load exceeds the service water heating load.
This is to limit the probability of
unnecessary consumption of energy for service water heating and/or
space heating, which could lead to excessive use of energy, which
could lead to an unacceptable effect on the environment.