Hi Artiku. The electrical usage depends on what size of heaters you plan to use. If you only have 110/120v available you will only be able to heat about a 5' x 5' space. All other larger heaters require 220/240v. Partly down the FAQ page on Infratech's website talks about electrical. Check it out by clicking the link here. If this does not answer your question fully let me know and I'll try to help!
Taylor's Backyard Center