Hello!
First time poster here. I've been looking around for some information on cascading combi boilers and just haven't been able to find answers. Found this site yesterday and there seems to be a ton of useful info. Now on for my question.
Currently I have a Navian NCB-240E. I love it. Had it install two years ago along with radiant floor heat.
My heat loss is about 100btu currently but now I am looking to add radiant to my basement (currently use a pellet stove) which will push me past what the NBC-240E can handle.
At first my plan was to simply add an additional NCB-240E.
The problem is that Navien doesn't allow you to cascade two NCB models. You can add their space heating only or DHW only models but not combi.
On the surface thats fine, I could just add the space heating model. But now I am finishing my basement and will be adding another bathroom. So I wanted the additional DHW capacity as well.
This got me looking around and I really like the Lochinvar NKC199N.
So that is the backstory.
Started to read the manual on the Lochinvar and it does cascade but only on space heating not DHW.
With all that being said I have two questions.
1) Would simply two of Lochinvars work by cascading the space heat and then running the DHW from both at the same time? If I'm pulling 5gpm it would just pull 2.5gpm from each at the same time correct?
2) From my research I can't find any combi that does cascading on both space and DHW, do you know of any that do?
Thats all for now. Thanks so much for any input.
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