Here is the info for the one I have, remember this is in USD funds and I paid Canadian exchange so my final cost was considerably more around $500.00 including shipping to MikeW's place. It costs about $15.00 per month to run in the winter because it is always running, come summer I turn it off. It is an expense I am willing to pay as I have some of the rarest tropical waterlilies in the world in my pond and treating them as annuals is not an option. PS, MikeW brought it to me on the plane as it did not arrive while I was visiting in time. He has a story about customs and the ordeal he went through to get this to me. Oh I almost forgot the additional duty he had to pay to get it through.
QSUBTY18: Q-SUB 1500 WATT Submersible pond/tank heater
304 titanium. 20 foot power cord, controller 1800w 120vExcellent for Pond Applications. Just lay it in the bottom of the pond or tank
Includes Flexi Float low liquid shut-off.
Includes liner-friendly neoprene bumper.
Specifically designed for Aquaculture.
Polypropylene Mesh Guard prevents fish from contacting heating surface.
20 ft (6.0 m) watertight cable and 8 ft(2.4 m) control cord to wall are provided.
Heater is hard wired for easier installation.
1000 and 1500 Watt heaters, also available in 240 Volt. Comes with wall plug and matching receptacle; add -2 to model number.
Example: QSUBDTY15-2. Add $50
Clip-on weight now standard. Replacement weights available.
International orders receive pigtail on control cord.
Retail Price: $ 375