Brivis SP521 Gas Heater 21.0kW / Indoor UNIT / AS NEW / Delivery! Happy to deliver today as it is in the truck due to moving Purchased in 2021, as new only few hours use Only used for 1 winter Price was 4500$ with all the bits Comes with some ducting, exhaust pipe, and new wall Mount controller, all wiring and everything needed 21 kilowatt unit with great efficiency This is an indoor unit that sits under the house for more efficiency. Very high energy efficiency rating Happy to DELIVER - please let me know asap.