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Old 05-09-2012, 08:39 PM   #16
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Navien CR-240a tankless water heater issues


Navien corp. of America (made in South Korea) sells a product that is a work in progress. Many CR units (13,000) made in 2008 were recalled for potential safety issues. They were also equipped with faulty PCB's. Numerous other problems forced the company to discontinue the CR line and replace it with the NR model. If you own a CR model and are having on-going problems, I recommend contacting your installer and have them explain your misfortunes to Naviens' service tech. I have been able to upgrade two customers to NR models so far, no questions asked.
I cannot stress the importance of proper gas supply pressure. In our area most gas meters are capable of supplying about 250,000 btu's. An NR-240A model will consume 200,000 btu's itself. That leaves little room for your 90,000 btu gas furnace, 40,000 btu gas range, 30,000 btu gas dryer, 40,000 btu gas logset and so on. Your tankless water heater will be the largest appliance (btu's) in your home by far. If your meter is undersized or supply runs too long or undersized it will be the Navien that will suffer. Did your installer check gas inlet pressure at the Navien with all other gas appliances turned on? Do not assume because it worked at one time that gas pressure cannot be the problem. Regulators fail, peoples usage habits change and quality and pressure of suppliers gas fluctuate. Don't be so quick to blame the appliance.
In my opinion, the jury is still out on this product but I am glad to see that the company recognizes some of it's problems and is addressing them.

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Old 05-09-2012, 10:10 PM   #17
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Navien CR-240a tankless water heater issues


The supplier I use said he hasn't seen any problems from the units they sold. He is their technical rep so he would get the calls
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Old 05-09-2012, 11:27 PM   #18
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Navien CR-240a tankless water heater issues


Quote:
Originally Posted by martoranas View Post
Navien corp. of America (made in South Korea) sells a product that is a work in progress. Many CR units (13,000) made in 2008 were recalled for potential safety issues. They were also equipped with faulty PCB's. Numerous other problems forced the company to discontinue the CR line and replace it with the NR model. If you own a CR model and are having on-going problems, I recommend contacting your installer and have them explain your misfortunes to Naviens' service tech. I have been able to upgrade two customers to NR models so far, no questions asked.
I cannot stress the importance of proper gas supply pressure. In our area most gas meters are capable of supplying about 250,000 btu's. An NR-240A model will consume 200,000 btu's itself. That leaves little room for your 90,000 btu gas furnace, 40,000 btu gas range, 30,000 btu gas dryer, 40,000 btu gas logset and so on. Your tankless water heater will be the largest appliance (btu's) in your home by far. If your meter is undersized or supply runs too long or undersized it will be the Navien that will suffer. Did your installer check gas inlet pressure at the Navien with all other gas appliances turned on? Do not assume because it worked at one time that gas pressure cannot be the problem. Regulators fail, peoples usage habits change and quality and pressure of suppliers gas fluctuate. Don't be so quick to blame the appliance.
In my opinion, the jury is still out on this product but I am glad to see that the company recognizes some of it's problems and is addressing them.
That's the biggest load of hogwash I've read in a while. All the items I highlighted are the responsibility of the certified/ticketed gas installer and not the manufacturer. If you've upgraded some of your clients' units based on the highlighted items above, maybe it's time you went and got your gas ticket or took a refresher course. I've installed maybe only 20 or so but I've not had one issue, except for the gas reg at my house which failed. And that is not made or supplied by Navien.

Done right this is a pretty good product. Done wrong, well all you have to do is Google "Navien problem(s)" or something similar.
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Old 05-10-2012, 06:40 AM   #19
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Navien CR-240a tankless water heater issues


I was responding in general to problems with Navien units. The two I replaced under warranty had leaking heat exchangers. Do not downplay gas supply issues, regardless of who is at fault. The most recent Navien training class we attended had an instructor who went on and on about gas supply issues. If you have a problem with what I posted then you are in conflict with him , not me.
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Old 07-20-2012, 03:08 PM   #20
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Navien CR-240a tankless water heater issues


2 years ago I bought a Navien Tankless. The first unit worked for 1 day then it is running hot and cold. After some research I came to realized that it is the water FLOW Sensor. I went to the supplier and get another flow sensor. it worked for 2 days and the same problem came up. The CS told me that they are having so many problems with Navien and Suggested another brand.
I went with Noritz.
Technically - on Paper Navien is a great Tankless. The problem is that $25 sensor error ruined the machine
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Old 05-07-2013, 07:09 PM   #21
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Navien CR-240a tankless water heater issues


ouR PLUMBER INSTALLED NAVIEN 240A 4 YEARS AGO AND NOW WE ARE EXPERIENCING RANDOM COLD WATER SPELLS SOMETIMES LASTING HOURS.

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