Replaced leaking 50 gallon water heater with new Rheem 50 gallon water heater. Venting goes through the fireplace chimney. Fireplace has been sealed off and cannot be used any longer. Provided customer with multiple options of water heaters. Advised customer that the county may take issue with the venting and if they did then anything the county may take ty required would be done at an additional charge. Customer understands. Customer has documentation of the fireplace being properly sealed. Tested for function and leaks.