Depends on what is generating the heat. Electronics, UL. But something like a camping stove would have a CSA cert. Chemical heating pack, perhaps an NSF cert. ANSI may have a say too. Depends on the product.
Depends on what is generating the heat. Electronics, UL. But something like a camping stove would have a CSA cert. Chemical heating pack, perhaps an NSF cert. ANSI may have a say too. Depends on the product.