Any "LEAD FREE"
For sweating fittings used in water heater installation, lead-free solder is best to ensure safety and compliance with regulations. Look for solder that is specifically designed for potable water systems to ensure durability and long-lasting joints. Be sure to follow manufacturer instructions and best practices for proper installation.
The different types of water heater fittings available in the market include compression fittings, solder fittings, push-to-connect fittings, and threaded fittings. These fittings are used to connect pipes and components in water heater systems.
These two nipples are called heat traps, when water is heated it expands and rises. These little flaps are to hold some of the heat in the water heater. You should use both of them. If you use copper pipe with solder joints you want to make sure and solder the 3/4 female adapter to a length of pipe and then let it cool before you screw it on to the silver nipples. Do not solder any fittings close to the nipples without using some kind of heat sink, a wet rag wrapped around the nipples will do the job. The blue thing in the cold water side of the heater is called a "dip tube" it is there to carry the cold water entering the heater to the bottom of the heater and not mix at the top of the heater with the water that has already been heated.
Always and only solder.
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Water Heater, Water Heater Repair or Installation, Gas Water Heater, Electric Water Heater, Hot Water Heater, Tankless Water Heater.
You can use a paste flux and heat (as from a soldering gun) to reattach the solder.
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Good question. There are a few simple answers. Most solders begin to become "plastic" at around 350 degrees Fahrenheit and melt at slightly higher temperatures than even that. If you are asking about a hot water heater: If you are operating your water heating system at that temperature the water will have already boiled off and most likely the heater will either have exploded, the P/T relief valve dumped or both. If you are asking about an electric heater, do not try to melt solder on it. The heating element is electrically "hot" and could present an extreme shock hazard. The best way to melt solder is with with a soldering iron or some kind of torch. Hope this helps