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While most people won't go to the extent they should to properly install a water heater the appropriate method is as follows: 1: the water heater has threaded fittings most likely 3/4" npt threading which should be mated with like diameter GALVANIZED nipples at least 2 inches in length. 2: mating to the nipples now extending from the water heater should be a DIALECTRIC UNION. This union is made to prevent contact of dissimilar metals. With a flow of fresh water across two dissimilar metals electrolysis will occur causing excessive corrosion of adjacent Plumbing. In direct answer to your question YES redo your sweat joints and my personal preference is NOT to use compression fittings.

AnswerI agree but try to use brass or copper instead of galvanized?

As of this post 06-07-2013 there have been so many advancements in fittings no one answer will cover it all. I know of plenty of "Pro-Press" jobs which are just fine but probably what ever fittings you are comfortable working with will work fine. Only warning watch out for dissimilar metals on domestic water lines that supply drinking/bathing water as it's oxygenated and will cause electrolysis to occur.

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Q: If you're installing a new water heater with current copper piping is there an advantage to sweating new joints or can you just use compression fittings?
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