Aqua Bed Warmer Non-electric Heater Blanket (Queen) 100% Cotton No electric wires, just water! Aqua Bed Warmer is the safest way to heat your bed! Safely heats your bed by circulating hot water through a soft mattress pad. Includes Water Heater and Mattress Pad (4 sizes available). Precise temperature and runtime control give you full control over your comfort. Noise-cancelling pump system ensures silent nighttime operation and peaceful sleep.