Posted: 18/06/2013 at 18:04
A HotBin, operating well , will get up to in excess of 60 Celcius - which will kill weed seeds. The trick in a compost heap/bin is to ensure all of the material gets to over 60 - mixing it up helps but its often all a bit marginal - which is where the weed seeds creep in unkilled.
I put my finished compost in empty raised beds in the spring and leave them to germinate anything left - like a "stale" seed bed - that way I can see if anything undesirable has been left!
If you want to see my thoughts on the HotBin ( and my composting set up and garden) go to www.the-compostbin.com and have a look at what I get up to