We have the Rinnai 29K BTU unit in our Condex in Nashua. Our home is small about 1200sq ft. 2 bedroom size. The Rennai heats the place through the winter. We do have electric baseboard as it was installed when built. But we never have used them since the Rennai was installed.
In our Moultonborough house, same size, we have a propane stove. 32k BTU. Heats the whole house. The difference between having the Rennai and the propane stove is if the power goes out. The Rennai will not work. The Propane stove will light off but no fan to circulate. But you will have heat. Just a thought about the Rennai, if using as a primary heat source you might want a generator handy.
Now we also have the Mitsbushi Mr. Slim Ac mentioned above. Right now if you upgrade to the heat pump/AC model you get tax credits back. That setup cost us about $3K.
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