[Greenbuilding] Alternatives to Solarhart Thermosyphon Tanks

[Antonioli Dan]

Does anyone know of any companies manufacturing solar thermosyphon tanks similar to Solarhart tanks (elevated above panels and mounted horizontally)? I've seen other models in Europe but don't know of any available in the United States. I'm looking for a closed loop tank that does not have the electric heating element in it. 

Thanks. 

Dan Antonioli