Check the power cord: a gas dryer usually has a standard 120V plug; an electric dryer typically has a thicker 240V cord with a larger plug
Look behind the dryer: a gas dryer has a flexible gas line connected to it
Check the vent area: both types vent air, so venting alone does not identify the fuel type
Read the label or model plate: it often states “gas” or “electric”
Look for a gas shutoff valve near the dryer: if present and connected, it is likely a gas dryer
Check the outlet: a gas dryer usually plugs into a regular household outlet; an electric dryer uses a special 240V outlet
Look at the controls or manual: the product manual or control panel may indicate the fuel type
Search the model number online: the manufacturer listing will specify gas or electric
Check for a burner access panel: gas dryers have a burner assembly and gas valve inside
Check for a heating element access panel: electric dryers use an electric heating element instead of a gas burner