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The 20ohms related to the resistance through the element. You need to check both.
Yes, I know. However, I'm confused.
You are measuring, from your picture, between Earth Connection and the element Live connection.
20 Ohms between those two points indicates that the element has shorted to ground. Meggering between the Live and Neutral should give you a 20 Ohm reading meaning the element hasn't gone open circuit.
While a multimeter can give you a reading, cold immersion elements can give weird resistance readings. Hence better to megger it with 500V.
Edit: Are you saying 200 Ohms or 20 Ohms. The '200hms' is confusing.
Mr_Sworld
sacredhart
On the thermostat yes.
The 20ohms related to the resistance through the element. You need to check both.