I believe the theory of more water was to hold it , a heat reserve of sorts ? I had one boiler that was about 250 gallons and unless the unit is so tightly insulated to keep all the heat in , it really makes no sense . They say you only take a few degrees out of the initial heated water and then it goes back ? not sure what that is in degrees , but I'm looking at a faster return , less water so that the wood is actually heating what is being used at present , not build up a volume of heat .Someone around here had one that he claimed heated over 2500 sq feet using a ten gallon boiler ? never saw it so ?? One other idea I had was two tanks side by side ,connected ,one the outgoing heated water , the other the incoming somewhat cooler water .....but I'm thinking that might not work ..........would be burning oak then to get it hot real quick .....lol.. Right now I run at about 86 to 90 degrees , and it's toasty warm
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