OOPS! haha yeah when i said larger i meant more surface area, Glad to hear your zzp HE is working well for you! i like getting feedback. As far as the other companies HE in my opinion (of course i am gonna be a little biast) i think that the american made quality and good price of our heat exchanger makes it a good choice for our cobalt community And as far as the posts that the other guys from our company make thats kinda beyond my control but i will mention something. Thanks!