Lochinvar gas pool heaters are designed with customer-satisfaction in mind. The highly-engineered design features several components that distinguish the Lochinvar brand from its competitors. These gas pool heaters come in sizes starting at 150,000 – 400,000 Btuh and are available to run on either natural gas or propane. Lochinvar leads the industry in innovation and has created pool heaters that are unrivaled in their short heat-up time, all while saving money on energy.