boiler is Weil McLain Gold CGa.
current circ pump is Taco 007-F5, installed on return side, pumping water down, and into the boiler.
I'm pretty sure this pump is under-sized, as the specs list a max head of 10 feet, and this system is used for heating the second floor unit of a 2-unit apartment. vertical distance from boiler to 2nd floor is wall over 10 feet, more like 16 feet. the apt has baseboard elements, but the temp in the unit never gets above 62-65. boiler temp is set at 220.
I'm looking to replace the 007-F5 with a Taco 009-F5, with a listed max head of 35ft. BUT, the 009 has a max flow of 10 GPM, compared to the 007's 23 GPM. Does this "upgrade" make sense??
Thanks in advance.