We have 2 Olympian Wave heaters. One mounted below the furnace controls in the stair way and another connected to a quick release coming out next to the vacuum in the living room. These are the smaller Wave 3 but keeps us toasty warm and they sip propane. Totally safe for indoor use but it is recommended to crack a window when using them. I do, but with all the leaks around the slides, I'm not sure how necessary it is. Best price I have found for them is on Amazon. Worth looking at.
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