400W consumes only a few seconds during the initial warm-up period. When its temperature rises a few degrees, the power is only 150-160 watts, which is all you need for soldering. https://www.amazon.com/ask/questions/Tx1PL4BNHZJNE9U?_encoding=UTF8&sort=helpful&ref_=pe_623860_70668520_ans_notf_saa_aas This is a very good soldering iron for medium jobs, but heavier wires and connectors require a 300-400 watt heating range. not suitable. I'm a retired old-school electronics engineer who's spent most of my life with a soldering iron in hand. The display is similar to what it was 15 or 20 years ago when some air compressor manufacturers were selling 5 hp compressors. They have 5 peak horsepower with starting current and not running current. Class action lawsuits are costing them millions of dollars.