Unfortunately the ones that were immune to this employed Mercury switches, which I don't believe are sold any more. We had an older gas heating stove which had

Unfortunately the ones that were immune to this employed Mercury switches, which I don't believe are sold any more. We had an older gas heating stove which had this and worked even when the electricity was out (particularly good in the winter when heating with electricity). Eventually that part failed and being an older model, that part was discontinued by the manufacturer. This forced us to get a "new" stove which now uses an electrical system to control it, and which doesn't have a battery backup integrated. Technically one could add a UPS, but since it also uses an electrical fan it would probably empty that ups within a few hours.