I have 2 blue flame heaters for sale. One is a 20,000 BTU and the other is a 30,000 BTU. They can operate on LP or natural gas and they both have built in fans as well as thermostats. They are about 5 or 6 months old and weren't used much. $120 for the 30,000 $100 for the 20,000. You can look the model numbers up on menards website. Call or text 785 648 0008.