Lochinvar Energyrite 400, 000 BTU Natural Gas Swimming Pool Heater - ERN402 Lochinvar Model: ERN402 Digital controls allow easy access to temperature settings Features a rust-free surface and advanced combustion system Includes two 2 inch CPVC union nuts, two CPVC tail pieces and two gaskets and operates at 120/240 Volts Low NOx emissions meet strict air quality standards