These irons are heavy duty and to be used for any type of ironing needs , doesn't need to be attached with any boiler , the gravity feed steam irons are being used for high density dry steam Runs on 240 +V volt electric; comes with electric steam bottle iron and is very easy to use Convenient soft-touch button switch, rotary heat dial and thermostat hanging bottle Comfortable urethane handle and hard non-stick anodized aluminum sole plate Complete Set with non-stick laminate base, water bottle, hose, iron rest Non-stick Teflon Shoe offers you antishine ironing