I have a 24’ round pool in Michigan. We’re looking to get a heater and are between the Raypak 156 and 206. I don’t plan on running it constantly, just a few hours on the mornings I know we will swim and water is cold. Does anyone have experience with either? Obviously the 206 is a more expensive heater but is one more expensive to run (does one cost more than the other to raise the temp x degrees)? Thank you!!!