Approximately 1kw of power is suitable per 1000 gals (4450ltrs) of pond water.
The 2kw Cloverleaf heater is compact and easy to use and is supplied with couplings and hose tails to connect to either rigid 1.5″ pipe or 3/4″ to 1.5″ semi rigid pipe. Temperature is controlled by adjusting a dial to the required temperature setting a minimum water flow of 4000 litres per hour is required to operate a safety flow switch which in the event of the pump stopping shuts the heater off to prevent damage to the heater.
For maximum efficiency and to maintain an ambient temperature the pond should be covered and insulated to help achieve and maintain the pond temperature in cases of insufficient insulation more KW per gal/litre may be required depending on the level of desired water temperature.
These heaters are designed to be pump fed and will not work on a gravity return.