Navien 180S2. Water heaters that earn the energy star come with gas, solar or electric heat pump technology. They heat your water just like standard models but.
Low exhaust gas temperatures allow use of pvc (including schedule 40 pvc), cpvc, polypropylene (rigid and. 8.4 gpm (32 l/m) wifi capable: Water heaters that earn the energy star come with gas, solar or electric heat pump technology.