Our little Santa Fe had its first real test last night. We've been lingering around 15-28 degrees for about 15 days, and its been purring right along on medium doing great. I basically run the feed wide open on low and medium. I let the tstat handle it at night, so if it gets over 72 downstairs we don't roast upstairs. Well we had a storm come through Sunday night into yesterday leaving behind about 6" of light dry snow, and it cleared up yesterday about 4pm. The temp immediately dropped like a rock to about 18 at sunset. By about 10pm it was 10 outside, and 69-70 inside downstairs. I hadn't really yet run the stove on high overnight, so I throttled back the feed some, poured another scotch, and flipped her to high. The scotch was only so I had time to make sure my adjustment was sufficient. Happy to say it handled our low of -4 with flying colors. I actually had to come down about 4am and throttle it back a little more as I was overheating. On paper the SantaFe is a little undersized (1800sq) for our 1970 ft, but our house layout sure favors it. Like an old big block under full load, they do get thirsty don't they? Or hungry I guess.