For rooms with normal ventilation. Cointra Ltd Optima COB-5b Water Heater with Accessories, New Propane Butane LPG camping gas. One-year warranty.  Very compact. 40% smaller than similar heaters. For many purposes to use. Just attach to a gas bottle,a water hose / pipe, an exhaust pipe to the outside, and you have instant hot water. 5 liters of hot water per minute (max) Temperature to 65 degrees Celsius Power 8,9 KW Gas pressure 30-37 mbar Gas consumption 0,8 kg / hour Exhaust pipe diameter of 8 or 10 cm. Gas and water connections are 1 / 2 Inch fittings. With CE approval The device is approved throughout the EU. Adjustable water flow and temperature. Automatic ignition on batteries. No power supply required. Great for mounting in a hunting lodge, apartments, caravan, mobilehome or in your kitchen Includes 2 x Stainless Steel hoses, adapter, batteries and mounting hardware. Dimensions: 45x28x13 cm.