Pentair is one of the biggest manufacturers in the pool industry, so it's no surprise they have a heater like the MasterTemp. The MasterTemp is a low-nox, eco-friendly, high performance heater. It has a space-saving, low-profile design ideal for home installations. Additionally, the MasterTemp is super quiet, which is perfect anywhere. It uses a pre-mix system and has a single burner which allows for faster heat up. The heater also adjust automatically based on your altitude. Other features include energy-saving hot-surface ignition, user-friendly controls and indicator lights. MasterTemps are available in 4 BTU levels ranging from 200,000 to 400,000. Check them out at PoguePoolSpa.com!