Elect. W/H Looped To Geothermal

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neolitic

Carpenter/Remodeler
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Location
Beech Grove, In
A good customer had a geothermal
heat pump installed a couple years ago.
I just noticed that they plumbed
a loop to the electric water heater.
They replaced the drain cock with a
copper nipple when they looped in.
Am I missing something,or isn't this
setting up a situation for the early demise
of the water heater?
Looks like a brass nipple should have
been used for this.

Besides wanting to help out a good client,
I just had the heater put in 3 years ago
as part of a bath remodel I did for her
and I'm not up for any problems for my
warranty....especially since that plumber
retired last year.
TIA


EDIT TO ADD:
Geothermal guys are coming out next week.
They already told the customer, over the phone
that this dis-similar metals thing is an old wives tale,
so some sort of citation from a recognized
source would be nice if I'm right about this.
 
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Hey, wait a minute.

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