So, the seller was to refund purchase price and shipping, only wanted to pay 70%, but not shipping, than claimed 61% was 70% (bad math pisses me off more than routine dishonesty), and eventually refunded $9 of my $17.36.
So I fired one up. Okay, heat output seemed okay. Flame wasn’t much different than a BRS-3000T. I did a side-by-side thinking I’d get efficiency number to assess if the flame was over-rich, but before it had boiled a pint (500 grams), the flame got lower and quieter. Like the canister was almost out. But the canister had liquid in it, it was inside my garage, and a normal 60F-ish temperature to the touch. And it kept decreasing, even as I opened the valve more and more. And eventually went out. Completely. And moving the valve, in either direction, did nothing.
I went to take the stove off the canister and Wow!, the base of the stove, closest to the canister was HOT! Like 160F. All that brass, going up to the burner head and down close to the aluminum (?) valve body conducted heat very well. I was unable to relight it for several minutes.
When it was completely cooled, it could be relit as before.
I theorize that dis-similar thermal expansion rates between the valve stem and the valve body caused the valve to close even when fully unscrewed.
Maybe, if I’d operated full-throttle, the pint of water would have boiled in 2 minutes (it quit completely at 4 minutes) and maybe been helped by more butane coming up through the stem, but a stove that stops before while boiling one pint of water seems pretty useless to me.
It’s going in the parts bin.