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Buderus Logalux LT DHW output nipple thread type
We had a Buderus oil furnace and Buderus Logalux LT hot water tank installed by the oil company about four years ago. Just noticed lots of green, reddish-brown, and white sediment caked around the DHW steel supply nipple (AB in the attached brochure) where a brass Tee fitting connects to it--possibly galvanic corrosion or mineral deposits from a leak that resolved itself. I want to remove the brass fitting from the steel nipple and put a dielectric union there. The Logalux LT product brochure identifies the steel DHW supply nipple thread as 1" but doesn't indicate NPT or BSP. It's probably NPT but since some Buderus threads are BSP I'd like to be certain. Help/info appreciated.