My club has several of these style heaters on a covered patio. They work well when the plastic walls/curtains are down. As with any outdoor heater, however, they don't do as well in wind -- so when the walls are up and the wind is blowing they're not effective at all. If you have a way to block the wind, they should work for you. Placement is also key. If you're sitting directly under them they'll roast your head, but too far away and you won't feel them at all. We've found the "sweet spot" is to position them over the dining table (or coffee table in a lounge/conversation set-up). I thought about getting some of these for the house but ended up going with the portable heaters for versatility.
we have the portable heater but it is burning holes in our pockets. and it takes up floor space. after reviewing, the clearances on this one above are too high so we are going with a calcanna which only has a 6" clearance from combustibles (patio cover where we are mounting it).
We have a natural gas line on the patio - If I could find a portable patio heater that took natural gas that was less than $1000 we would consider it for the convenience, of not having to mess with the tanks.
the mounted units for covered patios can be had for much cheaper. 2600 is alot of money. i am going this route for our open sided pool house so i don't loose floor space but i know when i have been looking they weren't crazy priced. i dont' know if i'm going eletric or gas yet though.
We just pick up a Patio Comfort NG portable heater from our local dealer for $579....works great and even comes with the quick disconnect hose. I hunted high and low for an affordable, yet quality, NG patio heater and this one seemed to fit the bill.