We bought a new house this year with a boil system for heat and water.. seems really efficient compared to a furnace system, I'm really liking it so far! But we also had a kid so I need to turn the water temp down, I've tryed adjusting the knob on the bottom of the big blue tank marked .. hot water maker tank.. but it did not seem to effect anything? Then there is a smaller blue tank.. I'm assumming that's a pressure tank?? Then I have a rain soft water softer after that.. other question is what do the three boxes coming out of the furnace control they are marked upper level .. lower level .. and water heater? Are these the thermostate for each level? Any help any understanding and adjusting this system would be great help! Thanks in advance!