That thing will use minimal electricity. Few hundred watts tops. It is also a very expensive heater with a computer board on it so you want pretty good power quality.What size portable generator would recommended to use with a Rinnai direct wall furnace ( natural gas) unit? Or would a kerosene heater work? The size of the building is 594 sq ft.
That thing will use minimal electricity. Few hundred watts tops. It is also a very expensive heater with a computer board on it so you want pretty good power quality.
Get a honda 2000 inverter set which is now a 2200 watt unit for somewhere near 1000$. Yamaha makes a similar model. You don't need this many watts but this is the smallest, common, high quality, inverter genset available that will also allow you to run the refrigerator and some lights. Yes, there are smaller ones but they are only slightly cheaper, less desirable for resale, use about the same fuel, similar size and weight, and are just oddballs.
To save some money, you can also consider the Champion brand of inverter genset. I own one of these and have been very happy with it.
I know how I would do it but you might choose another way. I don’t recall for certain but I believe that the rinnai is hardwired so you will need an electrical permit and an electrician unless you want to learn how to do it yourself.Thanks for the recommendations. Is there a video to show how to connect the inverter? I'm not great at this kind of stuff.