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Old 04-30-2022, 09:09 PM   #1
Junior Member
Join Date: Apr 2022
Posts: 9
Small Blue Crystals in drain of Rheem Electric Water Heater

I recently purchased a used 2017 Ford Transit 250 SMB. Learning my way around the systems, when draining the water heater, I noticed some small thin blue triangular crystals in the water heater drain. They might be described as blue transparent cooked sugar like you might see in a gourmet dessert. I soaked them overnight in vinegar to see if they would dissolve - but they did not.

I am wondering if they are broken glass from the heater and evidence of a frozen heater event. Any insight or experience? Does the heater need to be replaced?

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Old 04-30-2022, 09:15 PM   #2
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Location: Corvallis, OR
Posts: 5,175
Itís probably the glass lining of the tank. RV water heaters donít use a glass lining because of vibration, and use anode rods instead.
2000 E450 dually V10 wagon
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