| To install Tank less Water Heater:                     Decide where you want to install your tank less water heater. Some people  choose to install small units at every water outlet, such as under sinks,  behind showers and in laundry rooms. Others choose the larger whole-house  units, which usually are placed in the lowest part of the house, such as in the  basement, and against an outside wall for venting.                     Decide whether to use  natural propane to heat the water. Remove the old system. This will involve  first disconnecting the power source at the panel and then removing the  connections. 
 The tank must be drained before you disconnect the plumbing lines. Bolt the  tank less water heater in place. If you are installing it in the basement it is  usually recommended to first mount wood to the concrete walls so that you can  screw the heater into place. Smaller units may be mounted on walls on studs.
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