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For those experienced with tankless boilers, who has the highest quality product out there these days? Lochinvar? Bosch? Reem? Navien? I'm curious about some of the lesser-known high quality manufacturers too. Who's got the best boiler on the market that can do both hydronic heating and DHW...

Hi everyone, Could a leaking siphon tube also result in gas escaping from a Navien CH-240 boiler? I know - Naviens are fussy. But my CH-240 from back in 2010 has been humming along until just the other day. I found that it has begun leaking from the top of the "siphon hose" where it connects...

I just had a shower remodel completed and discovered that the hot/cold mix isn't right. So I followed the instructions to adjust the stopper, beginning with unscrewing the handle (Kohler Alteo Single Handle) and removing the escutcheon. Here is what I see... and I have some questions...

My water main shutoff in the garage seemed to have a failing valve that prevented it from closing all the way. Since the valve sat behind the drywall, with the knob protruding out, the plumber not only replaced the valve with a ball valve but also suggested he bring the pipe outside of the...

I have been troubleshooting the gas smell at the exhaust of my Navien CH-240. I noticed that DIP switch 4, which should be ON for and individual vent, and OFF for a shared cascading common, is set to OFF. I have a concentric intake/exhaust, and not a shared cascade common, which is for multiple...

I'm getting to know my Navien CH-240 and I appreciate much of the feedback and insight from some of my other posts. Here is a new one. I am hoping to get some tips on how to troubleshoot this. The other day, I noticed about 1/4 of water on the garage floor beneath the unit. Oh no! It was in the...

I am trying to piece together the behavior of my six-zone Navien CH240 hyrdonic system. Heat is radiant floor pex tubing under concrete. Thermostats are Uponor WT 1, one thermostat per zone, wired to a pair of 3-zone Wirsbo zone control modules. I am trying some experiments. Today I have a...

Hi, I have moved into a house with a ten year old Navien CH-240. It has one of those "two-in-one" intake exhaust things, and it runs about twelve feet out the side wall of the garage to the outdoors. (The Navien unit is in the garage.) I have always noticed a gas smell from the exhaust when it...

Hi, Should a Navien hydronic heating system turn on and off four to five times an hour? I am living in a place with a Navien CH-240 that drives domestic hot water and an in-floor, six-zone hydronic heating system. The hydronic system uses PEX tubes under a concrete floor. I have only ever had...