Dear Joe, there are no cons! I installed two Powerstream undersink units in my mothers home in England 29 years ago, they're still working! I now sell these, Bosch Aqua-Stars and Seiscos for a living. Call me at 1 800 851 9891. My company, Hot or Not Marketing Inc' has been in business nine years. All we do is sell tankless waterheaters and Magnetic water conditioning systems. Cheers,Brian. PS the Aqua-Star gas units have been around for almost 65 years.