We have been a Navien tankless installer for several years now. We have made mistakes, we have installed bad products, but we have grown over the years. Around 2009 we completely stopped selling and installing tankless systems made by Navien. People constantly asked and requested the systems from us due to the 98% efficiency claim. We had to either turn down the potential client or hopefully convince them to go with a different brand. Here is what transpired. 
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That second generation of Navien tankless water heaters had some serious flaws. From the electronics on the motherboard to a simple flow sensor, one thing or another inevitable broke down. Even to this day we still are constantly doing Navien service calls or Navien tankless repairs. At one point we wrote a post stressing that home owners not install a Navien tankless, which garnered the interest of Navien America. We were hit with a defamation claim and ordered to retract our statements… We fought back.
Today, in a way, we would like to retract our past statements. We are, once again a Navien tankless installer. Navien has had a third generation tankless available to Toronto and GTA home owners and residents since around 2011. We have only great things to say about this updated unit. Clearly Navien has taken this issues present in their past tankless and not only fixed them, but also improved the system.
The Navien has been upgraded to a definite buy!
We are again renting, leasing, selling and installing the navien tankless water heater throughout the GTA. That includes areas in and around Oakville, Hamilton, Burlington, Milton, Brampton, North York and Toronto.
See how much a Navien Tankless will cost completely installed here
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June 3, 2016
I AM A VERY UNHAPPY CUSTOMER ! IN THE LAST 2 YEARS, WE HAVE PURCHASED AND INSTALLED AT LEAST 6 OF THESE TANKLESS WATERHEATERS. DURING THIS TIME WE HAVE HAD LOTS OF TROUBLE WITH THE WATER HEATERS. WE HAVE BEEN IN CONTACT WITH NAVIEN ABOUT THIS. NAVIEN’S CUSTOMER SERVICE DEPARTMENT HAS BEEN NO HELP TO US WHAT SO EVER ! WE HAVE BEEN TRYING TO GET PARTS FOR THESE WATER HEATERS FOR OVER 3 MONTH’S NOW !!!!! WHY IS IT THAT NAVIEN HAD NO PROBLEM SELLING US THE WATER HEATERS, WHICH THEY KNOW ARE NOT CHEAP AT ALL!!!! BUT THEN WHEN WE—“THE PAYING CUSTOMER” NEEDS HELP, IT IS NO WHERE TO BE FOUND. WHY CAN WE NOT BUY PARTS FOR THESE WATER HEATERS?????? WHY DID YOU SELL US PRODUCTS THAT YOU WILL NOT STAND BEHIND??? WHY WILL NOT YOUR WARENTY DEPARTMENT OR SERVICE DEPARTMENT DO ANYTHING TO TRY TO HELP US. WE OWN A CABIN RENTAL BUSINESS AND HAVE BEEN UNABLE TO RENT 2 OF THESE CABINS !!!! NAVIEN AND THEIR PRODUCT ARE CAUSING US TO LOOSE MONEY DAILY AT THIS POINT!!!! THIS IS SO WRONG !! IF YOU ARE GOING TO SELL A PRODUCT TO THE PUBLIC??!! YOU SHOULD STAND BEHIND THAT PRODUCT AND AT THE VERY LEAST OFFER CUSTOMER SERVICE. WHY DO YOU SELL A PRODUCT THAT YOU WONT LET ME BUY THE PARTS FOR????? I AM VERY UNHAPPY AND WOULD GREATLY APPRECIATE IT IF SOMEONE FROM NAVIEN WOULD TRY TO HALP US FIX THIS???? AT LEAST GET ME THE PARTS I NEED TO TRY TO FIX YOUR WATER HEATER’S MYSELF!!!!!!!