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Australian Hydronic Supplies
10 Frankston Gardens Drive
Carrum Downs, Victoria,
Australia 3201
6.2 Electric boilers
These can be categorised as the following:
(1)
Off peak Laing electric boilers. An option when
natural gas is not available. Usually requires three
phase power to provide enough energy input for the
short time the boiler has to recover. For maximum
capacity, water has to be stored at the highest
temperature possible then mixed to a lower
temperature in use. This requires some form of
temperature controlled mixing valve. Running costs
similar to natural gas boilers but a very large storage
tank is required. Type B plumbing.
(2)
Instantaneous electric boiler. Some new
electric boilers are becoming available which offer an
alternative mainly for smaller applications on single-
phase power. Day rate electric makes it more
expensive to run but it is compensated by the
efficiency of
the
Tiemme
floor heating system giving a
far better heat distribution than a direct air heater of
similar capacity. Simple to install and control. Type D
plumbing.
(3)
Electric heat pumps. These water heaters
provide the efficiency of the refrigeration multiplier to
give excellent running costs where natural gas is not
available. Further efficiency can be gained by using
ground or water sourced heat, however, this all adds
considerably to an already high capital cost of
installation. This method is mostly suited to large
commercial applications. It can also be used as a
reverse cycle heat pump to provide base load cooling
to a building through the same
Tiemme
floor system.
Type D plumbing.
6.3 Geothermal
This can be categorised as the following:
(4)
Although ground sourced warm to hot
water is available in many parts of the
country, very few systems have been
installed. This is due in part to the isolated
places where hot water is available, although
Portland in Victoria is one place where it is
utilised. Similarly cold water from rivers and
large dams can be utilised for base load
cooling.