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Can a tankless hot water heater be used as a boiler?
I have a small radiant load 15,000 BTU and a larger hot water demand in my Sugar House. I was hoping to use a Navien or similar tankless unit to feed the radiant and use also as a the DHW unit. Can you cycle water back through a tankless like you would a Boiler? Maybe feed into a buffer tank with 2 coils. One for the radiant and one for the DHW.
Thanks in advance for for any help.