Our home has a Lochinvar Knight KBN105 residential boiler that was installed three and a half years ago. It has been cleaned every 12 months when the service-due notice appears on the screen. It runs on propane from a 1000-gallon underground tank. A couple of months ago when the temps started...
She won’t need allot of domestic hot water, and I would guess the building heat requirements would be around 50k BTU max. There are allot of tankless boiler/water heater combos out there. I’m in the HVAC controls business and Lochinvar is definitely a brand that I’m familiar working with. Would the Noble be a good choice?
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Lochinvar recommends always plumbing it as primary/secondary, with a hydraulic separation external to the boiler (see page 38 of the manual.) I don't believe there are by pass branches such as hydraulic separators etc.
I had a Lochinvar Knight WHN 85 gas modcon boiler installed in the fall of 2014. It's worked well, except for one foible: when starting up from cold, it will often "hoot". The hooting is at about 300Hz, and sounds like a foghorn or a French horn. It lasts for 2-20 seconds, easily audible...
Here is the deal with Lochinvar and Bradford White.. Bradford White makes the residential water heaters for themselves and Lochinvar. Lochinvar makes the commercial units (the big boilers) for themselves and Bradford White. I found this out ... hmm about 10+ years ago when I had to track down a burner tray for a Lochinvar heat exchanger/boiler ...