Cold in a tent is not really about the number on the thermometer. It is about the hour before you get into the sleeping bag and the hour after you climb out of it, when nothing you are wearing seems to help. That is the gap a small gas heater fills. Set it down in the porch, let it take the bite off the air, and the whole evening changes character.
This is built to be carried rather than installed. No cable, no battery to run flat, no generator to start. It runs on gas, which means it works exactly the same at a trailhead as it does in your kitchen during a power cut. Plenty of these spend most of the year in a garage and only come out when the heating fails or the weather does something the forecast did not mention.
Treat it like any combustion heater in a small space. Ventilate properly, keep it well clear of tent walls, sleeping bags and anything loose, sit it on level ground, and never leave it burning while you are asleep. Follow those rules and it is a genuinely useful bit of cold-weather kit rather than a risk. Available as a single, as a two-pack, or in grey, and the pair makes sense if you run a bigger tent or want one permanently in the car.
Reviews below include verified buyers of this exact item from before it joined the REIDWOOD kit, plus REIDWOOD customers as their gear gets out there.