Our panel heaters and oil heaters can be used unattended, as well as our Wi-Fi-enabled floor heaters (CO1200WIFI3 and CO1500MAXWIFI3). However, the other heaters should not be used without supervision. This is because the other heaters operate using heating elements and are not meant to be on for extended periods; they are intended for supplemental heating only. Our Wi-Fi-controlled floor heaters have the same internals as our panel heaters, so they can be safely used unattended.