16-01-2004, 03:04 PM
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Pond Heaters for Sale
The message
from (Craig) contains these words:
they are 11,000 watts/24 Amps/220V and make 37,500 BTU!
thats enough for a small house 
True! If you would like one to heat your 25,000 gallon pool, this
would do nicely as well.
I should explain further though....
These heaters have two elements in them and are designed for 208/240
single phase power. You would have several options. It seems as
though we have a couple EE's here so I am sure they can come up with a
couple of different ways, but potentially you could run half of the
heater on 115v power. This would also allow for a reasonable current
draw for a normal circuit. This larger heater would only need to be
on for a short period of time to increase the water temperature. I
don't think it would be an issue, but you might want to increase the
differential of the thermostat to prevent short cycling of the heater.
Under most circumstances cycling does not adversely affect an
electric heater.
I like the idea: I've always had a hankering for excavating a big tank,
insulating under and beside it and heating it (with solar energy as much
as possible) and constructing a greenhouse/polytunnel over it.
This would take care of the greenhouse heating at night and during the
colder times of the year, and humidity could be regulated by ducting
ventilation through the airspace at the top of the tank.
Being dark in the tank, algæ should not be a problem.
However, later and more fanciful thoughts ran to creating a big pond
within a polytunnel and heating the water the same way, circulating it
through a barleystraw filter, then through a sand filter, and growing
tropical waterplants, keeping fish, and on the banks on either side
growing tropical - or at least sub-tropical fruits and vegetables.
To think that I once had the room for this project but no money to do
it, whereas now I don't have the room but could afford to play games....
--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
http://www.users.zetnet.co.uk/hi-fi/
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