Romex Non Metallic (NMB) sheathed copper wire
An essential yet often overlooked component when installing a tankless water heater is the use of the proper wire. The heater will simply not work properly if you do not use the correct wire size. You will need to use 6/2 wire for some heaters and 8/2 wire for others. The price on this wire is by the foot so just select the proper size for your application and then add how many feet you need in the quantity section of your cart.
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