Gas tankless water heater installation, in short, involves mounting the unit, connecting electricity, gas and water lines and flue installation. The electric type does not need venting but requires more volt power. Installing a tankless water heater is a challenge, and it can be hazardous if it is not done properly..If your water heater uses electricity, plug it in to the wall.* If your water heater is gas, you will need to hook up a gas supply line from the stub at the wall to the new water heater. Open the valve so that the handle is in the same direction as the line.. Build a platform with inch pieces of lumber that will allow you to mount the new tankless water heater about inches from the wall. Mount the tankless water heater securely to the platform. Safety Choose a location for the new water heater that will allow you to vent it to the outside easily..Tankless water heaters also feature a compact,e saving, wall mounted design. Although the initial cost of a tankless water heater installation is greater than installation of a water heater tank, lower operating and energy costs are likely to offset the higher purchase price..
Remove the old water heater. Turn off the water, gas supply valves and power. Install a new gas line. Install a tee and valve in the existing gas line if needed. Install new water lines. Mount the water heater. Connect the water heater. Install the vent. Turn on the water heater. Plug in the water heater..