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AprilAire 4978 Replacement Steam Canister Electrode Wires for AprilAire Steam Humidifier Models 800, 800LC, 801, 865, and 866 (2-pack)

SKU: 4978


  • BUY WITH CONFIDENCE These genuine replacement electrode wires are designed by AprilAire – the leader in Indoor Air Quality solutions – and made in the USA
  • PERFECT APRILAIRE FIT Designed specifically for your whole-house AprilAire Steam Humidifier
  • FOR OPTIMAL PERFORMANCE Inspect electrode wires every year and replace every three years, or sooner if they become loose or damaged. Also replace your steam canister once per heating season (steam canister sold separately).
  • HUMIDITY FOR HEALTH AprilAire Humidifiers can help you maintain optimal humidity in your home of 40% – 60% which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. In addition, you’ll feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions.


AprilAire genuine replacement part for AprilAire Steam Humidifiers. Two wires per package.

Go to for replacement instructions or to find a local AprilAire HVAC professional to maintain your steam humidifier.

The AprilAire steam humidifier electrode wires provide electrical current to the water in the steam canister, heating it to a boil and creating steam that is distributed through your home. To maintain peak performance and the continued safe operation of your AprilAire Steam Humidifier, the electrode wires should be replaced every three years. Remember to inspect the wires annually; they can be replaced sooner if loose or damaged.

AprilAire invented whole-home humidification and continues to lead the industry. Since launching the first humidifier in 1954, AprilAire has built a comprehensive product offering – all designed to create healthy air in your home. AprilAire Humidifiers keep the relative humidity in your home within a healthy range, which has been shown to reduce the incidence of respiratory infections and allergy and asthma symptoms by minimizing the formation of bacteria, viruses, fungi, and dust mites. In addition, balanced humidity helps reduce chronic sore throats, nosebleeds and dry skin. Your home will feel more comfortable and items in your home susceptible to damage from low humidity, such as wood flooring, will be better preserved.


  • (2) 4978 Electrode Wires


  • Compatible Models: 800, 800LC, 801, 865, 866
  • Materials: Steel – Zinc Plated
  • Actual Measurements: 0.77H x 0.77W x 17.5D (inches)

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