I have decided to eliminate my floor-standing, 1500W heaters (other than for backup purposes). I have found a ProFusion Heat, model EH-4604B, that is a ceiling mount. Northern Tool & Equipment sells this unit (as well as other companies). It is a 240V, 7,500W forced air unit that produces 25,600 BTU at the 5,000W setting. I can also use a 3,000W and a 4,000W setting that would produce less BTU. I imagine, and this is just a guess, that I would probably use the lowest wattage for the vast majority of time. The 5,000W setting is rated to heat a 1,000 sf. space with a 12' celing. My greenhouses are only 120 sf. with 8'-9' ceilings. Does anyone have experience with this particular unit?
