First of all you need to adjust the circ. launch temp. it shouldn't be circulating at 140. It will burn much better if you let it get to 160 or a little higher before the circ kicks on.Ok so I got my biomass 40 up and gassifying. I was worried at first because the temperature of the boiler didn't want to go above 140 with the circulator running but I believe that is because it was taking so much to warm the storage tank right off the bat. I have 1000 gal of storage. What I'm curious about now is how to get the pump to shut off when it's done charging the tank. I want the temp to be around 180, but when it's at 180 the circulator on the boiler keeps going. The bioler is in a back shed that is insulated but I feel like its just a giant heat sink that's draining the system and wasting all that extra heat I put into the tank. Any ideas on how to keep it from circulating when the tank is above 170?