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[schoppy]

I am not sure about your stove, but my outdoor wood stove uses pex tubing to my buildings. The water line would have to be copper or steel to be utilized as a grounding source. Water itself, pure water, actually is a very good insulator. It is the minerals and deposits in it that cause water to conduct electricity. The water itself should never be relied upon to be the conductor for grounding purposes. 

[userdk]

I have no idea how other brands are made but the Heatmaster electrical box is connected to the frame and is grounded.