QMark unit heaters can be purchased online through mass discount retailers, such as Amazon, as well as from specialty electronics retailers, such as Mor Electric Heating and H-Mac Systems. Internet auction sites, such as eBay, also frequently contain listings for QMark unit heaters.
Listings for QMark unit heaters on Amazon contain a picture of the specific product as well as a detailed description of that model's functions and features. Each item's listing also contains a customer review section, which is comprised of an quantitative satisfaction rating, displayed as a star ranking ranging from one to five, and a qualitative written account of the user's experience with the product. As users are able to rate the helpfulness of each review, the site automatically features the highest rated positive and negative reviews at the top of this section. A question and answer section can also be found in each product's listing, wherein users are able to pose questions about the item to the community.
The H-Mac Systems website allows users to browse different models of QMark heaters by line, with each line containing listings for different models. Listings are comprised of a description of the model as well as the price after any applied discounts or sales.