I am considering lowering the GPM that circulates threw my boiler, there is hydraulic separation from the rest of the system. My goal is to rise the water temperature. it's 1,200 gals and it's set to move 30 GPM threw the boiler. Got a circuit setter, so adjustment isn't an issue. I realize that you don't get something for nothing, I am curious if anyone has had an issue with this situation and by reducing the GPM were able to rise the temperature of the discharge. and see an advantage of the hotter water, IE; bigger splits,small pumps or what ever. This year it seams like I got plenty of warm water and not enough hot water!! It's the third year and I keep messing with it to get it where it should be IMO