I have an upright steamer, that is bulky and produced constant steam, no trigger button. It works, but can be a hassle at times.
What I use more is a handheld steamer, shark, nothing fancy. Reservoir is in te handle, it plugs in, as has a trigger button to release steam, or keep it inside until ready to use. 330ck gifted me with it, and it's fantastic! Wouldn't want to use anything else.