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Not all tankless water heaters are zero clearance and not all are designed for indoors.
I didn't see the make/model of your specific heater, so google that model and see what the instructions are for installing. It will be clear in the instructions if you can do what you want.
It will throw off a little bit of heat, but if it is ventilated properly, it should be OK, just be aware it wont be ideal for some foods that like cooler storage.
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1988 930 Venetian Blue
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