Is there a way to sell a used water heater?

Our family got an atmospheric water heater a few months back (April 2018) and just found out that the configuration of the house doesn't allow us to use a heater that was atmospheric venting. Therefore we were wondering, is there a way that we can sell the water heater? The water heater is in excellent... show more Our family got an atmospheric water heater a few months back (April 2018) and just found out that the configuration of the house doesn't allow us to use a heater that was atmospheric venting. Therefore we were wondering, is there a way that we can sell the water heater?

The water heater is in excellent condition and has only been used for 3 months.
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