Not tested. In overall clean shapes minimal rusts no rust inside tank. Seems to have rarely been used. The UNTESTED Coleman 512A Catalytic Heater with a 3500 Btu heating rating is a reliable heating solution for camping and hiking trips. This green-colored metal heater from Coleman is designed to run on Coleman Fuel, providing warmth and comfort in outdoor environments. The Coleman 512A model is known for its efficiency and durability, making it a practical choice for those looking to stay cozy while on the go.