I am looking to install a pool heater for my 12x16 semi above ground pool. My issue is I built a deck around the pool and I keep the filter under the stairs. The plummer told me it wouldn't work to put the heater under the stairs. Can any other type of heater go under a stair case. There is enough room side to side and about 3 1/2 feet from the floor to the level of the deck. My other option was to leave the filter under the stairs and place the heater on the deck about 1/2 foot up then drop the pvc back under the deck. The deck is level with the pool. Any ideas would help.