This Noritz NR8DVC bundle has everything required for your natural gas tankless installation! Can be mounted for indoor installations only Heat exchanger is manufactured with commercial grade copper, 25% thicker piping than standard models An isolation valve kit is included for serviceability 12-year warranty on the heat exchanger, 5 year on parts, plus all Noritz models feature a 1-year in-home warranty (Price subject to change without notice. Check stock before order)