is this a good idea

keyote

My entryway is not actually fully included in my design because its going to have a high load im not even sure i should even try and heat the outer 4x4 vestibule but the inner 5x 12 plus stairwell will have to be pretty warm to compensate and for losses up stairwell. Been thinking it would need to be a separate higher heat zone either with euro panels or a slab radiant, pretty sure the boiler has three water temp zones built in so it could be dhw/ radiant /and entryway. but i wonder if using the return water from the indirect might work better because it would lower return water temp. does this make sense?