A fully self-contained portable hot water system with its own 12L (3.2 gal) tank, built-in pump, and gas burner. Fill it up, set your temperature, and press start. HOTTAP Go recirculates the water until it reaches your chosen temperature, then delivers every drop at that exact heat. No cold water wasted warming up. No external pump or plumbing required. Everything packs inside the tank when you're done.