The figure shows the parts you need and how they connect into your water heater to provide heat for your Koi pond. The system circulates water from the water heater, to a heat exchanger, and back to the water heater. Water from the heater and water from the pond never mix -they just get close enough to transfer heat. The heat exchanger can be put in a variety of places.
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| Gas Water Heater Schema |
The figure shows the heat exchanger in its own tank as a separate stage in the filter. Pond water is pumped to the heat exchange tank, flows over the heat exchange coil, and then flows into the filter. The heat exchanger should be completely submerged and in an area where there is a good flow of pond water moving across it.
Constructing Your Gas Water Heater System
To build your heating system, you will need the following materials:
- Shutoff Valves (2)
- Circulating Pump
- Heat Exchanger
- Flow Regulating Valve
- Thermostat (optional)
- Timer (optional)
- Misc. Pipe and Fittings
Test water heater system to make sure nothing leaks. Put insulation on the pipes from the water heater. Set the flow regulating valve so that it will allow a little more water through the system than you have calculated that you need, but not too much more. Watch the water temperature in the pond closely for several days until it has stabilized. Note how often the circulating pump is running.
With the flow set close to the minimum, the pump should be on most of the time. Make changes in settings in slow increments. It will take a while for the temperature to stabilize after changing settings.
Source:
Efficient Koi Water Heating Using Your Gas Water Heater,By Larry Lunsford.
http://www.usakoi.com/profile/news/read/id/38
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