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So, I am preparing to replace a small residential steam boiler (Slant Fin, Mod. #GXHA-120-DPZ) due to a casting failure (water leak) and am looking for suggestions regarding the piping between the boiler and the existing mains. I have a 4" C.I. Tee bullheaded into the horizontal main (side outlet facing down toward the boiler, approximately 40" above the 2 1/2" outlet tapping). My plan is to increase the supply piping to 4" as close to the outlet as possible and continue with 4" all the way to the tee in the main. Included within this dimension will be the header, the equalizer piping to the return & Hartford Loop and a 4" x 1" tee to feed a single radiator not included in the main. Two questions, is 4" overkill and while I prefer C.I. fittings, I am finding it difficult to obtain the correct configurations, therefore, am considering malleable fittings. I know standard piping procedure is to use C.I. however, anyone foresee problems not using them? The returns are 1 - 11/2" & 1 - 1" , therefore, they should be fairly easy.
Thanks for any input.