120V

All-in-One Immersion Water Heater with GFCI Protection： Portable 16.7" design fits tight spaces. heats small pools (including above-ground/in-ground pools, inflatable pools, Small swimming pool) bucket, Bathtub / Hot Tub, spas, baptistries & livestock tanks,(Professional grounding required for metal containers).GFCI / overload protection with Auto-reset function : (1): 24/7 GFCI monitoring, (2): 0.03s leakage cutoff, (3) Auto-reset function (no manual restart), (4) overload protection.Durable 316 Stainless Steel Seamless 316L (≥16W/m·K) delivers 30%+ higher efficiency than conventional heaters, tubing resists saltwater /chlorine/corrosion, leak prevention.Precision Temp Control | ±0.5°F Accuracy： Auto-hold thermostat (44-212°F range) pauses at target temp and auto-resumes after cooling, No manual reset needed. Ideal for: Spas (98-102°F), Pools (77°F), Freeze Protection (45°F+).Critical Safety : 1. ALWAYS SUBMERGE before power-on to prevent overheating. 2. Surface gets hot! Cool before handling. 3. Use dedicated outlet (no shared cords). 4. Keep 1m from flammables. Verify voltage match.