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Thanks for relying. No, not automotive antifreeze. Plumbing glycol. I have dual 400lb tanks. Slab is 1000sqft. 1/2” pex spaced 9” apart. I believe it’s about 1500ft. I found a loose wire on what I think is the firing unit. Looked like a spark plug wire, one was loose. It fired this...

I have a new installed Navien nhb 55. I installed it myself and I’m trying to figure out the settings. Heated concrete slab in my barn. Right now I was able to set it to Custom with outdoor sensor disabled. It heats SUPER slow. The supply temp only come out maybe around 75f and that’s after a...