Let us know what you learn. A lot of folks here have their own special idea of what "survival kits" should have. My own favorite is a number of specialized "mini kits".
Please be careful with any indoor combustion. More people die from carbon monoxide than freezing to death in the home. Burst pipes are your most immediate danger, as long as everyone has enough clothes and food to avoid hypothermia.
One alternative (or really, "redundant source") are survival candles. I love redundancy because it lets me pick and choose what seems best in a particular situation.
Another item to consider is a propane-fired catalytic heater. These are flameless, and intended for use inside tents. They're also certified as no-carbon-monoxide for use in enclosed areas, although I'd try for a tiny bit of ventilation. They use one-pound disposable propane tanks, or the larger ones have a hose to connect to a barbecue-type tank.
In any case, you might want to consider some CO detector badges at about $5 each, since they don't need electric power.
