This replaced a higher end unit that I've had for 10 years.  I went with this smaller unit to ensure fitting.  It is small but mighy, and was kicking out nice heat in my 240 sq. ft. studio (vaulted ceing), but not sure if it would really heat up to 1000 sq.ft?  Installed today, very easy.  A bit of a break-in burn smell but went away.  Can't beat Wayfair!