Although through Acts of God, these heaters can be damaged (especially in the Southern states where winds can be fierce often times), when they are installed in normal climate areas, the Sunpak patio heaters rarely every malfunction or break. In order to keep your patio heaters in best possible conditions they can be, it is important to have them checked and tested by a professional yearly before a typical patio heating season (such as summer). In all tests that have been conducted on these patio heaters, these heaters have surpassed every one proving how durable and reliable products from Sunpak can be. Made of both aluminum and stainless steel, these heaters are made to stand up to the toughest of weather conditions. With Sunpak, you can expect durable products with reliable quality.