won't help anything either. Filters filter particulates -- however small they may be. Problems, if any, with heat exchangers come from the dissolved chemical makeup of the water, and filters won't do anything about that.
Of course, if your water is seriously full of particulates... but I hope it isn't!
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch