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Heat Pump Water Heaters
MWP Series
Application
Before installing any swimming pool heating, a heat load
assessment of the pool should be rst conducted by consulting
with a qualied engineer. There is no simple ‘rule of thumb’
according to the size of the pool. The following additional
factors must be considered before selecting a heat pump with
appropriate performance to suit the nature and proposed usage
of the pool.
• Is the swim season summer fringe, off season or all year
round?
• What are the climatic conditions at the location of the pool
installation? (Summer/Winter)
• What water temperature is the pool to be maintained at
whilst in use?
• Is the pool in direct sunlight, predominantly shaded or
indoors?
• Is a pool thermal insulation cover to be used correctly while
the pool is not in use?
• If below ground, is it in an alluvial/gravel soil type?
A swimming pool cover is highly recommended for heat
retention and energy savings (Figure 2).
An alternative consideration for selecting heat pump capacity is
the heat-up time from cold. Swimming pools have a huge
thermal mass so pool temperature does not change rapidly with
the operation of the heat pump. A typically sized heat pump
could take several days to elevate the pool temperature from
cold to desired setting. If a pool is only used intermittently
through the colder period, then a selection based on minimum
heat-up time may be required for the heat pump capacity.
Figure 2 Heat Loss
Large heat loss
(Uncovered)
Lower heat loss
(With cover)
Small heat loss
to ground
Magnus heat
input to pool
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