Lasko, Pelonis, Holmes, Delonghi, Mr. Heater, Honeywell...
These manufacturers control much of the market; the Holmes group, for instance, controls more than 30% of the North-American market, and sell their heaters through different brands.
Other important manufacturers of small electric room and personal heaters: Grainger/Dayton, Cadet, Marley/Qmark, Sunbeam, Dimplex, Myson, Optimus.
Holmes, Patton, Bionaire and Coleman belong to the same group (Jarden). They sell fan, quartz, ceramic and oil-filled electric heaters through big home-improvement stores (Walmart, Home Depot…), local dealers and online. For prices and customer reviews at Amazon: Holmes Heaters.
Mr. Heater is a leader in portable propane, kerosene and natural gas heaters in the North America. Their small space heaters are sold at the big home-improvement stores, dealers and online. For customer reviews at Amazon, see: Mr. Heater Heaters
DeLonghi is largely focused in ceramic and oil-filled electric space heaters. Their models are sold in local and online retailers and at the big home-improvement stores. Their best-rated models are oil-filled radiators and ceramic infrared space heaters. For customer reviews at Amazon, see: Delonghi Heaters
Honeywell also produces small electric room heaters (mostly ceramic, but also convection, radiators and radiant quartz...). They sell their products at home-improvement stores (Walmart, Target…) and online. For customer reviews at Amazon, see: Honeywell Small Electric Heaters.
Lasko's sells mostly small ceramic space heaters and low-profile baseboard heaters. They sell their products in home-improvement stores (Lowe’s, Target, Walmart) and online. For prices and customer reviews at Amazon, see: Lasko Heaters
Pelonis has a wide range of space heaters, mainly of ceramic, oil-filled and radiant types. They sell them in specialty stores, regional dealers and online. For customer reviews and prices at Amazon: Pelonis Heaters
List of Small space heaters manufacturers & brands