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Water Heater Dielectric Union. It's important to plan ahead on a plumbing project and figure out where the unions are going to. Note that the unions are not at the nipples of the heater.
Water Heater Union Fitting from homewaterheatersforsale.blogspot.com
Any two different metals will create a potential when separated by an electrolyte solution such as potable water. What is a dielectric fitting on a water heater? The idea behind a dielectric union is that the water heater can act like a battery cell aka galvanic cell.
(Well, Duh.) Yeah, But That Actually Creates A Problem.
Both hot and cold water pipes must have this accessory; 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. The sharkbite stainless steel braided flexible coupling hoses can be used as a dielectric.
As A Homeowner I Recently Installed My Indirect.
This video details how to replace the dielectric unions/nipples of the water heater that make up the hot and cold connections coming from and going to the wa. A union does not mate up with the water heater. It happens slowly over many months.
And No Mention Anywhere Of Dielectric Unions.
The import ones can't even handle more than 140*. After the dielectric nipples you can just use a standard brass/copper union. This is especially true for copper and galvanized steel piping which is usually the case when a copper supply water piping line meets the galvanized steel pipe hookups of a hot water tank.
What Is A Dielectric Union?
Any two different metals will create a potential when separated by an electrolyte solution such as potable water. Water is the electrolyte, and the combination of two metals and water essentially becomes a battery. Galvanized can be hooked directly to the water heater just fine.
October 2014 Edited October 2014.
Dielectric fittings however, if the tank nipples or tubes are made of galvanized steel and you connect them to copper, you will need a suitable called dielectric connection to make the connection. That union is worthless anyway as all new heaters are taller than the old ones. Do i need a dielectric union for my water heater?
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