I just received the gas bill for heating my pool for the month of June, it was $235.00. Being retired, I am looking for less expensive ways of keeping the water at 85°F. The pool system is currently running 12 hours per day. The current Teledyne-Laars heater is 18 years old and probably is due for replacement. By the way, I live in north Texas so the outdoor temps are not an issue.