Char ... I too have searched and searched and still haven't found any smaller units that are CSA or ULC approved, other than one Benjamin boiler in Nova Scotia. I'd sure like to find something that can look decent where a wood burner should go, but still does the job for my hydronic floor heat. The challenge here in Canada is finding something that will not nullify your house insurance, look decent enough to replace a wood burning stove, AND burn relatively clean like a new EPA wood stove can.
Here are the results I've found so far (none of which I am entirely happy with):
Benjamin Dutch Oven - (Nova Scotia)
smallest size I have seen but not eco friendly burning
cheaper than many European boilers and it's CSA approved but it won't look good sitting where the aesthetically pleasing wood stove sat.
http://www.benjaminheating.com/dutch.htm
Kerr Highlander
Nova Scotia boilers - about the same situation as the Benjamin only larger in size.
http://www.kerrheating.com/
Thermo Control
(broken link removed to http://nationalstoveworks.com/boilers.htm)
I don't see any ULC or CSA designation so keeping the insurance co's happy could be a problem)
Greenwood Furnace - eco burn - big and ... ahem ... very "green"
http://www.greenwoodusa.com/greenwood-series-wood-furnace.php
Eco Burn Boiler - good eco friendly burning but pricey, bulky and doesn't seem to have the CSA approval necessary for Canada
http://www.altheating.com/econoburn.htm
Fireplaces with water jacket LAZAR S (European - not approved over here)
(broken link removed to http://www.hkslazar.com/our-offer/water-fireplaces/)
Tarm USA - large furnace like
http://www.woodboilers.com/
Garn - Monster big Boilers
(broken link removed to http://garn.com/content/Products.aspx)
Alternate Heating Systems - big and bulky
(broken link removed to http://www.alternateheatingsystems.com/boilers.htm)
Royall
(broken link removed to http://www.royallfurnace.com/IndoorBoiler.htm)
Charmaster - large furnace type - not sure how clean the burn is.
http://www.charmaster.com/
Valley Comfort / Blaze King - They used to manufacture a water jacket but that seems to have disappeared from the maket
http://www.valleycomfort.com/
Yukon Eagle - wood furnaces and I believe they also used to have a wood boiler - they now seem to only have the "Hot Rod water heater" - Unfortunately insurance companies seem to hate this sort of thing.
http://www.yukon-eagle.com/FURNACES...HEHOTRODTOFITYOURNEEDS/tabid/183/Default.aspx
If you find anything - I'm all ears/eyes
good luck