I have an EFM oil fired hot water boiler for heating and domestic water. I was wondering about the settings for temp. control, about lowering it and to what temps to go to. It is set at 190 for the HIGH and 160 for the low. This seems high to me, its a 3 story house with radiators in each room. There are 2 zones, 1 for the basement and another for the rest of the house. Any info I thank you for!