Most any convective stove should be no problem at 4'. My BK has side shields, and anything a few inches away is barely warm. My Spectrum doesn't exactly have shields, but is similar by design, and I get the same results.
Really? The Spectrum isn't too hot on the side? That's excellent: my s.o. really likes the Spectrum's colour options, but I ruled it out thinking it would be too hot. I was aiming for the Neo, but the s.o. doesn't like it's shape. And the Blaze King is right out: matte black is apparently No Good. I pointed out that its shape is sleek and elegant, and the heating specs are the best I've seen, but that isn't getting me anywhere...