Hello, my name is Steve, I live in Wasilla, Alaska. Tonight it's cold, somewhere around -6. :bug: I have been burnig a GW 100 for almost 2 years. There is a learning curve and I am a slow learner it apears. I got the stove in april of 06 and proceded to "plumb it in". I had plenty of boil overs with the 3/4 in pex and tiny expansion tank that comes with the unit. Year 2 I replaced the 3/4 with 1 " and better insulation. Installed 300 gallon tank, have had fair success. Heating bills went from $180 a month to $35 month, natural gas, cooking, laundry, DMH. Will use nearly 15 cord of birch/popal this season. Obviously I would like to decrease my wood usage. How do I properly plumb my heat tank? I am prepared to build a 750 gallon tank and would like input about return and feedlines, temperature monituring, etc.. As of today I have no refractorary cracks, but have had pipes hot enough to melt foam insulation, soften solder joints, and inflect 2nd degree burns. :-S Where do I find figures for heat loss in a home, gallons per square foot of storage, BTU per gallon, etc.. The years of knowledge that are present on this forum will certainly aid in my quest for perfection which is what we are all seeking! -Steve.