Dielectric Unions If either the tank nipples or the pipes are galvanized steel, however, and you are connecting them to copper, you must use a fitting called a dielectric union to make the connection. Both the hot and cold water pipes must have this fitting — it’s a code requirement.Click to see full answer. In this manner, are water heater nipples dielectric?Most water heaters come from the factory with dielectric nipples (which are galvanized) with the plastic inner sleeve.Beside above, can you run PEX directly to water heater? PEX can’t be directly connected to a water heater. First extend a pipe 18 in. from your water heater and connect the PEX supply to the pipe. Likewise, people ask, why do you need a dielectric union? Dielectric unions are used to separate two dissimilar metal pipes (such as copper pipes and galvanized steel). Purpose of dielectric unions is to prevent galvanic corrosion, which is caused by electrolysis.Can I use flexible pipe for water heater?No CSST (corrugated stainless steel tubing) or flex gas line piping shall be used as a gas drop to the water heater. If your existing gas line has CSST that has not been bonded, bonding will be required at this time.
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