Average Reviews:
(More customer reviews)I have a Navien CR-180A (gas) and it's the worst water heater I've ever experienced.
1. It doesn't use less gas. I keep records of utility usage and in the summer months my gas bill is no lower with this unit than the previous 30gal tank HWH (hot water heater). If anything, it's slightly higher.
2. It does not supply constant temperature water to my shower. With the old HWH I was able to set the shower up, step in and shower for as long as I liked (probably never more than 15minutes) without readjusting the shower. Now, I must readjust the temperature several times during even the briefest of showers (5 minutes).
3. It doesn't always supply HOT (very warm yes, but not HOT) water. I notice this when setting up the dishwasher. I upped the temperature setting from factory recommended 120 to 125 degrees. I turn on the hot water tap at the kitchen faucet and let it run to heat the water in the line so the dishwasher draws hot water without a cold water "slug" in the line. I'm a hot water wimp and I can't tolerate even 120 degree water but with this HWH I can leave my hand under the tap flow for minutes. The HWH is in the basement directly below the kitchen so the pipe run is only a few feet. I get warm water and I start to pull my hand away and the water will actually cool off. This happens regularly when the HWH is in the "sleep" mode and not running the circulation pump. This does not occur at the washing machine only a few feet away.
Perhaps the HWH requires a higher flow rate to work but given that it doesn't use less energy than my old 30 gallon tank unit I see no reason to spring the extra bucks for a tankless unit. Perhaps Navien fixed the problems in subsequent designs but unless there's no alternative I won't waste my money trying to find out.
One nice feature is the circulation system that allows me to have almost instant hot (warm) water at the bathroom faucets but this could have been installed without going tankless.
Early on I had the installer come back because I noticed water collecting inside the unit. They installed washers to let the water drain outside the unit on the floor. It apparently is a very small quantity that evaporates quickly and I've never noticed a puddle under the unit. I complained about poor temperature regulation and they suggested I "reboot" the unit by unplugging and restarting. If it hadn't cost so much I'd reboot it with a slegde hammer - permanently.
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