heater cost propane site:www.troublefreepool.com
A NG heater is much cheaper to run that a LP heater. For comparison, a gallon of propane is about equal to a therm of NG in terms of BTU output (~100,000). The average cost of a therm of NG is $1.00 (mine is $0.77) and the average cost of LP is $3.00 (mine is $2.75).