RV Tank Heater Pad 12" x 18" Holding Tank Heating Pad Use with Up to 50 Gallons Fresh Water with Automatic Thermostat Control (120V-1PC) is up for auction in Automotive. The current bid is $6.00, 75% below the $23.99 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.