Heatilator fireplace fail
I would call a chimney person to inspect the chimney and make recommendations to fix the chimney. He will be able to give you pricing on your repair options for the chimney. The cost of the chimney repairs will vary depending on the type of fuel you will be using and what the codes are for your area. Where I live the cost for a chimney repair for natural gas is much less than the cost to burn a solid fuel (wood) etc. Depending upon the condition of the present insert, you could see if it can be repaired.