Aim high with Navien... High efficiency, High output, High performance, all in one compact combi
Navien new NFC-H and NCB-H are the ultimate high efficiency condensing combination boilers with the capacities to supply both heat and domestic hot water for larger homes — enough space heat for a whole house, plus hot water to run up to 3 showers and a dishwasher all at the same time.

https://www.navieninc.com/residential/combi-boilers
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