My Tarm solo 60 says that the boiler is 190 degrees according to the control panel and the aquastat threaded into the top of the boiler. The problem is the temp gauge on the supply pipe wont go over 160 until the return temp climbs to about 120. Is this happening because the termovar is not letting much water retrun from the tanks when they are cold? Am I just recirculating water with limited flow through the tanks? That would make sense because the tanks seem to be reaching 160 on top and then charging the whole tank to 160 (top to bottom) before they chimb hotter?