Picked up a trick from a firewood sale and went from a 20 degree delta to 28 degree delta. The unit is a Heissheaters.com mid sized unit. It was recommended that I put on a 3 stage circ but I opted to use the Taco 007 I had been using on my (currently off-line) EKO40Super. The trick was in the setting of my ball valve supply flange comming off the circ. I had been running wide open but now I am about 2/3 closed. My setup is very simple and the unit I am using is still a wood hog compared to the EKO but now I think I have a chance of getting to the end of heating season without mortgaging next years wood supply to stay warm (that means going fossil fuel) {sorry all didn't mean to let that slip out I was just elated at the new prospect of the boilers operation}. Since I idled my EKO I wonder if slowing the circ flow down would have shown any improvement on the units efficiency?? Any ideas on that? Thanks ahead of time..Cave2k