How long does it take to get your tank up to temp from initial start-up of 60 degrees to 180 degrees?? I finaly got my tank insulated with 12" to 20" on blown in celluose and I fired the boiler up last night. The top of the tank went to about 135 degrees with 4 hours or so then the bottom caught up with the top temp. After about 12 hours the whole 1500 gallon tank was around 145 degrees. Does this seem to be tanking longer than is shoud to get up to temp ? I think a 3 way valve would help a lot when starting from the cold temp below 120 degrees, also I wish I had a little more BTU My tarm is rated at 105,000.