Products FPUA Natural Gas Service Offers: Commercial & Residential Engineering Assistance to incorporate Gas. Installation Professionals to insure gas applications are installed correctlyAssistance with planning and budgeting your new Gas project. FPUA Natural Gas Services Include: Gas Furnace Installation and conversionEfficient Gas Water HeatersHot Water Heater InstallationGas Service InstallationGas ServiceGas Features in your homeGas Features outside your homeGas Pool Heater