SEE MY HEATING COSTS UPDATE further down the thread.
I thought it would be interesting for those considering getting a heater for their pool.
I decided on natural gas heater. Pool store got me a 266k Rheem for my 17.5k pool.
$1250 Gas company needed to run 128 ft of gas line from side of my house back to the pool shed area and hang a new meter. (we couldn't run off the house gas for some reason)
$1995 Cost of heater
$360 4 hours of labor. (The pool guys helped me pull out two bushes, they set the heater on some pavers and levelled it) 4 hours? really? hmmmm
$500 HVAC guy to install approx. 12 feet of pipe (through two walls) from new gas meter to the heater.
TOTAL = $4582.
Cost to run (I keep it about 85F):
First partial month: (May)$176
EDIT: UPDATE for 2016 down the thread.
Sounds like a lot.... but I LOVE MY POOL!!!