" energy. It's recommended that tankless water heaters be installed by a registered professional who has gone through an extensive installation training course to ensure proper installation and service. Installation takes about four to six hours. This tankless water heater comes in two designs, either self-contained weather-proof units for outside the home or wall mounted for inside the home. This unit is 9 inches deep 14 inches wide and 24 inches high. It's easily concealed and much smaller than the traditional tank heater, which takes up valuable floor space. Additional parts of the installation include attaching the hot and cold piping; installing the propane or main gas line; installing the electrical supply and control wiring; and installing and connecting the concentric direct vent exhaust system, eliminating the need for any additional ventilation or blowers for proper venting. Some tankless heaters include a remote digital control panel. This panel allows you to remotely adjust the temperature of your hot water from your bathroom, laundry room, or kitchen. This feature allows you to set a lower temperature for instance to protect against scalding if you have small children or older individuals in your home. Within hours, the tankless heater is installed and ready for service with an expected lifespan of up to 20 years and delivering all the hot water you need when you need it. You'll never take a cold shower again."