Marey 10L gas tankless water heater saves space and is easy to install almost anywhere. It heats an unlimited volume of water as needed and permits you to regulate the water flow and gas flow to a better temperature. The unit provides up to 3.1 gallons per minute, to provide hot water for your home family at multiple points of use! It comes with a user manual with installation orientations, as well as a 5-year warranty! Customer service works from Monday to Friday, from 8:30, am to 5:30 pm CST. Make sure you select your preferred gas type before you purchase your model.