Laminova... I'm using model E54 which is v high throughput... plan on $200-300 of additional parts for plumbing. BAT distribution out of Sarasota FL is the primary NA distributor for Mocal.
Here's a brochure and some other links:
http://208.109.215.220/files/laminova.pdf
Laminova heat exchangers - Laminova
British American Transfer
Laminova Heat Exchanger - Modified Magazine
Often used on motorcycles