Systems using heat pumps for hot water
                     Systems 
using heat 
pumps for 
hot water
Introduction
Heat-pump hot water systems collect heat from the surrounding air via a refrigeration 
cycle. They then heat water in an insulated storage cylinder through a heat 
exchanger.
When operated on a heating cycle, these systems operate similarly to reverse-cycle air 
conditioners but heat water rather than the air within your home.
Because the heat in the air ultimately originates from the sun, a 
heat pump hot water system in areas like Mossvale may be regarded as a sort of 
solar water heater. In comparison to solar hot water systems, heat-pump systems do 
not require an electric or gas booster. However, as they heat water, they need 
electricity to power the evaporator fan and compressor.
These systems generally consume between 60% and 75% less energy than a traditional 
electric hot water system. This is because the heat pump is powered by electricity and 
does not directly heat the water with an element.
Typically, heat-pump water heaters are placed on the ground. They can be put inside in 
some instances. This may be a benefit over a solar water heater, as collector panels 
are not required on the roof, simplifying installation. They must be positioned in a well-
ventilated environment, as they require continuous access to ambient air to operate.
Different types of systems
There are two types of hot water generated by a heat 
pump:
Ø  Integrated systems
Ø  divided systems.
Integrated systems
The heat pump is frequently installed on top of the storage cylinder in an 
integrated system, including:
Ø  evaporator
Ø  fan
Ø  compressor
Ø  condenser
The evaporator (which absorbs heat from the air) may be separate from 
or wrapped around the storage cylinder in various circumstances.
Because these systems are packaged as a single unit, they are often 
heavier than split systems.
Separated 
systems
Split systems include the evaporator, fan, and 
compressor into a separate unit that is 
connected to the storage cylinder by 
refrigerant pipe - heated refrigerant gas 
travels through a heat exchanger situated 
inside the cylinder to heat the water. They 
have a lot in common with split system air 
conditioners.
The efficiency of the 
system
Losses of heat
All storage systems lose some heat through the cylinder walls, referred to as "standing losses," and heat pump water 
heaters are no exception. This means they use energy even when no hot water is used. The larger the cylinder, the 
greater the heat loss. Heat losses can account for a significant part of total hot water energy use in small dwellings.
If you're going to be gone for a lengthy amount of time, turn off the heat pump hot water system in areas like 
Mossvale at the switchboard to conserve electricity.
Rate of re-heating
If you live in a cold area and consume a lot of hot water, the rate of reheating or recovery (litres per hour) is critical. 
This is influenced by the following:
Ø  system design
Ø  the ambient air's temperature and humidity
Ø  the cold-water supply's temperature.
When the ambient air temperature is lower, the reheat rate will be slower. Certain systems have an electric boost 
element that activates as the air temperature drops. This reduces the amount of time required to heat the water in the 
storage cylinder. However, this will increase the cost of operation.
Utilize the timer
Many heat-pump systems now include an integrated timer 
that may be used to regulate the amount of time the 
system is working to heat water. This is advantageous if 
you have a rooftop solar photovoltaic (PV) system. If 
you operate the heat pump water on a peak power 
tariff, you may programme the timer to run the system 
during the day's middle hours to make use of solar 
energy.
Costs of operation
A heat-pump hot water system consumes significantly less energy than an electric hot 
water storage system. This is because it utilises electricity just to power the compressor 
and fan, rather than directly heating the water with an electric element.
If the cylinder is large enough, these systems may be run on the lower off-peak energy 
price overnight. However, it is critical to ensure that the system is the appropriate size 
for your needs.
Additionally, these systems may operate on a peak power tariff, which means they will heat 
water as you need it during the day.
If you have a rooftop photovoltaic (PV) system, it may be advantageous to operate a heat 
pump water heater on a peak energy tariff and use a timer to limit water heating to the 
middle of the day. This maximises the utilisation of the power generated by the 
photovoltaic system by lowering the quantity of electricity exported to the grid.
Conditions favourable 
to heat pumps
These systems are suitable for use throughout Mossvale, although they perform more 
efficiently and swiftly heat the water when the outside air temperature is greater.
Heat-pump hot water systems do not have an energy rating. They must be evaluated for 
efficiency under two schemes: the Small-scale Technology Certificate (STC) scheme and 
the Mossvalen Energy Upgrades scheme.
Heat-pump systems are rated according to their performance in five distinct climatic zones. 
Mossvale is located in climatic zones 3, 4, and 5.
• Zone 3 encompasses the Mossvale portion.
• Zone 4 encompasses the majority of the remainder of the state.
• Zone 5 is a heat pump-specific zone that encompasses the coldest areas of Mossvale.
You can get in touch with our team for the heat pump hot water system in areas like 
Mossvale.
Disclaimer: This is a generic Information & post; content about the services can be changed from time to time as per your requirements and contract. To get the 
latest and updated information, contact us today or visit our website.
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