Bosch AquaStar 28,000 to 130,000 BTU tankless heater provides endless hot water for 1 major application at a time. Delivers up to 4.6 GPM. No standing pilot - electronic ignition. Vents horizontally. 12 year warranty on heater, 2 year warranty on parts for both commercial and residential use. Saves up to 50% off utility costs. Compact and lightweight - can simply hang on the wall from hooks (included). Modulating gas valve to control temperature - pressure relief valve included. CSA approved.