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Heating indoor Pond

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Posted by mm2001[nospam] on December 7, 2003, 9:11 pm
This is slightly off topic, but the people in this group would know the
answers.  I am heating a 200-300 gallon pond with electric heaters.  I have
a natural gas hot water tank.  My Idea is to:  Install a Heat exchanger
pumping hot water from the output of the hot water tank back into the bottom
of the hot water tank's drainage port.  I would then install another closed
loop system heating the pond.  Questions: would this be a problem with my
hot water tank?  Would there be too much pressure circulating water into the
tank?  Are there any recomendations for a very slow flow hot water pump? (2-
3gph)  Thanks

Posted by Dale Farmer on December 7, 2003, 10:06 pm

"mm2001[nospam]"@adelphia.net wrote:

    First thing I'd do is put in a lot more insulation.   What is this pond
used for?  Fish tank, bathing, decorative?  How closely do you need to control
the temperature?  What is the cost per BTU for electric heat versus gas heat?
    There is no reason I can see that your proposed setup should not work.
modulo competent design and installation.  Need more data to really say for


Posted by Sonideft on December 13, 2003, 11:59 pm
 Trying to use your existing natural gas heater to replace the electric
heater seems like an efficient thing to do. My thought would be to place a
coil of soft copper tube around the bottom of the pond. This is a lot
cheaper than using a heat exchanger and the copper tubing can handle the
pressure. You may want to try and use a 3-speed Grunfos circulator pump so
that you can vary the speed and see the results that you get. Perhaps you
could use the existing thermostat off your existing electric heater to
control the temperature by driving the circulator pump.



Stephen Cumminger, P.Eng, MBA, MCPM
Senior Consultant
Sonideft Solar
Tel: 902-865-2189
Fax: 902-484-7897
Email: stephen.cumminger@heatwithsolar.com


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