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What's the difference between a navien NR210 and the Navien NR210 (A) models
The "A" has a built-in "buffer tank" to prevent the cold water sandwich effect. I just got one installed and wish I had stayed with my good old fashioned TANK water heater.

In 41 years living here I was never a minute without HW. Since I got this installed about 6 weeks ago me and my plumber have become close friends and I'm getting tired of cold showers.

In fact, as I type this he is out trying to get a replacement flow sensor since we have no HW yet AGAIN. It's great when it works.
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