The high limit control was usually set at 190 to 200F. A circulator (reverse-acting control), if there was one was set at 110-120F. The pressure in the system was about 12-15 psig. The old boiler is working well, but they were about 55% efficient, so installing a new one would make a great saving in fuel. It is simpler to turn the power to the boiler off during the summer.