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How does a higher delta T affect heating? I know the higher the delta t the lower Gpm at a certain amount of btus.... For example 100,000 btus 20 f Td = 10gpm and 100000 btus at 30f td is 6.6gpm....on condensing boilers installation manuals they always show a pump abs pipe sizing chart. ....I always use the 20f it usually results in bigger pipe and bigger and expensive pump. ... When should i use higher delta T? Thanks Paul S