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Navien 240 Combi. When making DHW for a bath or shower, temp on the unit shoots up to 160-180 and it makes a high pitch whistling and rattling. I popped the cover off and the rattling seems to be coming from the heat exchangers. Unit has been working fine for a few years and flushed once a year...

Have a Navien NCB-210 that's been running well and Dana helped me tune last year. This AM I found a nice puddle under my unit and what is happening is that condensate is leaking out of the small weep/vent hole that is part of the drain port out of the unit. I pulled all the piping, checked for...

I posted an earlier thread here trying to tune my Navien NCB-210. Dana was a huge help and I got it to a good spot where I had supply temp at 140, getting good condensation and long burns, except for my fin tube zone. I was happy with everything, except now I'm seeing a new issue. When the...

...any options short of ripping everything out or cutting a hole in the ceiling below the pan?

Sorry in advance for the simple question as I'm just a DIY. I have a Navien condensing boiler that was installed with a whole home renov. a few years ago. The GC/Plumber who put in the unit...lets just say didn't do a great job with supports of the plumbing under the Navien. So the entire...

Question about what my hot water temp should be on this boiler with the following specifics - 2700sq. ft. house. Two floors. House is located in Long Island, NY. -House is new construction so insulated very tight across the board, Andersen 400 windows and well insulated Thermatru doors. Three...