Raypak M206A 206K BTU Pool and Spa Propane Gas Heater High Altitude. The Raypak Digital gas heater comes with a microprocessor-based control center. This allows you to set your pool or spa temperature precisely at your preferred setting by simply pressing the up or down temperature control button. The digital display provides a constant readout of your pool or spa water temperature. Just set it, and forget it! Truly simple. If only your VCR were this easy to operate.