After the water boils put the spaghetti in the pot and, stirring constantly, wait for the water to boil again. At that time cover the pot tightly and turn off the heat. Set your timer for 19 to 21 minutes depending on how well cooked you like your pasta. Your pasta will be fully cooked with no boiling over and no wasted energy.
If you have an electric stove take the pot of the burner before you cover it.
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