Chaska Series Home / Our Specialties / Fireplaces / Inserts / Chaska Series Chaska 25 Viewing Area 22-1/8”W x 12-5/16”H BTU 25,500 - 13,000 Heating Capacity Fuel Type Gas Chaska 29 Viewing Area 26-1/8”W x 12-7/8”H BTU 30,000 - 16,000 Heating Capacity Fuel Type Gas Chaska 34 Viewing Area 30-1/8”W x 17-13/16”H BTU 34,000 - 18,500 Heating Capacity Fuel Type Gas Chaska 335S Viewing Area 29-5/8”W x 15-13/16”H BTU : 36,500 - 22,000 Heating Capacity Fuel Type Gas