Determining the correct replacement anode rod requires examining your home's water quality and the specifications of your existing water heater tank. Standard residential water heaters typically accept 3/4-inch NPT threaded hex-head anode rods made of aluminum, magnesium, or zinc-alloy. If you experience sulfur odors, an aluminum or zinc-alloy rod is recommended. If your water is normal and non-corrosive, a magnesium rod provides superior protection. Always check your water heater manufacturer manual and measure available overhead clearance before purchasing.
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