The Rinnai EX22DTN is a high-quality direct vent wall furnace that runs on natural gas. With a 22,000 BTU heating capacity, it's perfect for heating large indoor spaces efficiently and effectively. The EX22DTN features a programmable thermostat that allows you to set your desired temperature and save on energy costs. The compact design of this furnace makes it an ideal choice for small spaces, while the low NOx emissions ensure it's environmentally friendly. Additionally, the optional propane conversion kit offers additional fuel flexibility. Overall, the Rinnai EX22DTN offers a reliable and energy-efficient heating solution that is easy to install and use.