This is a very common question I get. Well all this information I provide is based on experience not books. Most pump charts that provide “Head and GPM” are based on pressurized systems which we are NOT using so the charts are worthless to assist us for proper sizing. I have talked to many pump experts who tell me “that it will never work” well I then tell them I have hundreds in the field working great. The bottom line is these pumps are designed to be in a closed pressurized loop, and experts only know that information. Most outdoor wood furnaces are not Read More