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Thanks for the answers. Now I just have to explain to the owner not to adjust anything

I need to extend the Navien outdoor temp. wire. The manual says use 18ga wire. Is it a soldiered connection since the sensor an electronic device, and not electrical? Will extending its length effect the resistance and alter the preset high and low set points, or do the set points have to be...

During the very cold end of December this year, the Heatmaker 2 tank finally started to leak. It flooded the ground floor and thru a friend we had installed a Navien 210E within about a week. Two plumbers working 17 hrs due to the piping layout refit, flipped the dip switch from natural gas to...