The recommended journals and magazines below publish in areas related to your topic and may be useful to search individually or browse through. However, all of the databases listed above provide results of thousands of peer-reviewed journals, magazines, and other sources and will provide more results.
Below is a listing of selected Underwritier's Laboratory (UL) standards relating to various space heaters. You may wish to search their catalog to see if there are others.
UL standards are free to view online. You need to create a free UL account in order to view them. The "digital view" button will open the standard's online viewer. The online viewer only allows you to click page-by-page; there is no search function or download available.