The output is probably OK, but you'll want to have the ability to contain
that heat somehow. Consider having a number of cheap, plastic drop-cloths,
for example, to hang from the existing structure. Otherwise, the slightest
breeze makes the heater and the thermal mass of the pool have essentially no
value.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!

.. . . . . . . . . . .
"Diana Kulaga" wrote in message
news
As most of you know, we grow outside in south FL, in a lanai under
screening. Last winter, we had some vicious (for here) cold weather.
Unprepared for the duration of it, we ended up carting plants in and out.
The collection is bigger now, and more unwieldy, and 'carting' is not
something I want to do again if we have similar low temps this winter.

Next week, we are installing a 'wet fan' (all weather, out in the rain is
fine) to push air down toward the plants if needed. Now, we're
considering
a propane heater. Area is approximately 14 x 18 (all open, of course).
Thinking about a 25,000 BTU heater for the area. Solar heated pool is
about
20 feet away, so gives some continuing warmth as well.

Any thoughts? All suggestions much appreciated.

Diana