Problem: the pool is too darn cold.
Answer: Barbeque!
Yes, this guy adapted his BBQ grill into a heater for his 8000 gal. pool. Oh yes!!! See, have thumbs will create. I love mankind sometimes.
Oh yeah, he can be back to cooking a mean steak in three minutes. Makes me want a pool and a BBQ.
The device heats water 30 to 35 degrees at 3 to 4 gallons per minute flow. I find I get a 7 degree increase in my 8000 gallon pool for each 5 gallon tank of propane. Each tank will burn for about 13 to 15 hours on high. A pool cover is required.