I need a new heater for my pool for next season. I'm starting to see some discount coupons for heaters and wonder if I should buy one now to save some $ and stick it in the garage until April 2014. My pool is a 27,000gal inground gunite 3M quartz plaster. I have natural gas. The heater I just took out was a Laars/jandy 400,000BTU which seemed to raise the temp in the pool roughly 10 degrees in very little time. Maybe 6-8 hours. Do I need another 400,000BTU heater? Or does it seem reasonable to go with the smaller unit to save even more $? What brands does anyone recommend? The JandyLaars only lasted 8 years before it started giving me a lot of trouble. I think the heat exchanger started leaking within 8 years.