For heaters, the cord needs to handle higher current and heat. A few tips can help you pick safely:

• Match the load: Check your heater’s label for amps. Choose a cord rated equal to or above that (many portable heaters draw up to 15A at 120V).
• Go thicker wire: Use 12 or 14 AWG for heat-producing loads. Shorter lengths (6–15 ft) can help reduce voltage drop.
• Use a grounded plug: A three-prong cord and a properly grounded outlet are advisable.
• Pick the right jacket: For indoor use, look for SJT. For outdoor or shop use, SJTW/SOOW or cold-weather flexible jackets can be helpful.
• Practice safe setup: Plug heaters directly into a wall outlet when possible. If an extension is needed, avoid power strips and keep cords visible and uncoiled.

The right cord depends on your heater’s plug type and electrical draw. Here’s what to look for:

• Plug style: Many heaters use a grounded 3-prong plug; some use a polarized 2-prong. Match your heater’s plug exactly.
• Amperage rating: Choose a cord rated for the heater’s amps (often up to 15A on 120V circuits). The rating should be clearly printed on the cord.
• Wire gauge: For heat-producing appliances, 14 AWG or heavier is generally recommended. Avoid light-duty 16 AWG for higher-draw heaters.
• Length and features: Keep it as short as practical. Low-profile or rotating plugs can help behind furniture. Look for UL/ETL listings and strain relief.
• No substitution: Use a cord designed for power delivery—don’t use heating cable as a power cord.

Replacing a heater cord involves electrical safety considerations. If the cord is frayed, melted, or loose, stop using the heater and consider the following:

• Match specifications: Use a replacement with the same plug type, wire gauge, and amp/voltage rating. Some heaters require grounded cords; others use polarized appliance cords for heat-producing devices.
• Connector style: Many replacement cords attach with terminals or eyelets; they must match your heater’s connection points.
• Follow instructions: Consult the product manual. If instructions aren’t available or the heater is hardwired/high-amperage, a qualified technician may be advisable.
• Avoid makeshift fixes: Taping or splicing an old cord can create hazards.

When in doubt, consider a model-specific replacement cord and professional installation to help maintain safety.

They serve different jobs and aren’t interchangeable:

• Power cord: Delivers electricity to an appliance (like a space heater). Focus is on safe current capacity, plug type, and wire gauge (e.g., 14 AWG, 3-prong grounded).
• Heat cable (heat tape): Generates heat along its length to help prevent pipe freeze or warm floors. It’s a fixed-install product with a specific voltage (120V or 240V) and wattage per foot, often used with thermostats.
• Use cases: Power cords connect devices to outlets; heat cables are installed on pipes, roofs, or under floors.
• Selection tips: Choose a UL/ETL-listed heat cable sized for the application and follow manufacturer instructions; select power cords by amperage, gauge, and environment (indoor/outdoor).

Engine block heaters typically use a dedicated replacement power cord designed for cold-weather use and outdoor conditions. When choosing one:

• Connector compatibility: Match the cord’s end to your heater element (many use molded connectors or eyelet terminals).
• Grounding and rating: Look for a grounded 3-prong plug and a cord rated for outdoor use, with cold-weather flexible jackets (e.g., SJOOW/SOOW).
• Length: Common lengths are 6–9 feet, but options vary. Keep excess slack secured away from moving or hot engine parts.
• If extending to an outlet: Use a heavy-duty 12 or 14 AWG outdoor extension cord and keep it as short as practical.

Always route cords carefully and follow your heater’s instructions.