micky wrote:
On Wed, 4 Jun 2014 16:42:16 +0200, nestork
wrote:


Jim:
It's actually a good idea to have two water heaters plumbed in
series.
That way, if and when one water heater kicks the bucket, you can
simply switch over to the other water heater while the first one is
being replaced.

Also, you can use that second water heater while doing maintenance on
the first heater, like replacing the anode in it. That way you're
not in a situation where you go without hot water unless and until
you can replace the anode.


All that follows is true about in parallel too, right?



Actually, in series, it does not apply. In parallel, it does. If you turn off
the second of 2 heaters in series, the water in the second will get cold after
while of non-use, snd you will get cold water when you turn on the tap.