Navien NCB Boiler Overview

My original Navien was installed in 2012. No problems for 5 years. In March of 2017, the heat exchanger started leaking. The unit had to be replaced. The good news; the unit had a 10-year heat exchanger warranty, so it would be replaced for free. The bad news; I had to pay my plumber $2,000 for the labor. Yesterday, three months after the unit was installed, no hot water. Called the plumber. He and Navien Tech determined the internal pump went bad — not covered by warranty — because it's a replacement unit, with a 30-day parts warranty. Wtf!! I'm not out $300 for the replacement part plus labor fees. Overall the unit is good, but heaven forbid anything goes wrong. I will never purchase a Navien product again.

I have been installing these boilers professionally for over five years. In those five years I have over 100 of them installed in various applications from basic baseboard to huge mono flow systems requiring multiple boilers to work together. Of all the units I put in, I have had issues with two of them. One was a pump failure and the other was a bad board. The pump failed because of debris. I put a strainer on and never had the problem again. I started putting in special receptacles in to clean up the power and the board problems went away. Just like you plug your computer and TV into a surge protector, you need to protect the circuits on any of these high technology appliances. They are computers and susceptible to power fluctuations. The most important part of the installation is the installer. If the price is too good to be true, it usually is.

My ncb-240 has been great so far. No problems. These need to be installed correctly, and your water has to be good or tested. Most of these complaints are probably from bad installations. Great value.

"Garbage!" If you plumber recommended to you a Navien hot water boiler, hire new plumber, if you installed already- go to Home Depot and buy a couple of electric heaters as well because your going to need them when your unit continuously fails. I had a NCB 240 installed in couple different customer, each one have lot of problem, now I me ridge with this garbage. Every couple month it has failed, it was flame loss then two way valve quit working now my igniter switch is junk, in each boiler pressure sensor need to replace after 3-6 month. The idea of saving money because it's high efficiency goes right out the window when you use Navien product. Do your research before you buy and save yourself the headache.

Haven't had heat nor hot water since Sunday night 4/11. We've been having issues with our Navien combo boiler since installing it 1-1/2 years ago. Worst customers service! 3 different plumbers say it's a bad unit, but the rep for Navien, Repcor, said it's the install, Speaking to these people is like talking to AT&T…Ridiculous – no help! We just want our money back.