Rena Smartheater - 100 Watt Fits as intake tube to all RENA SmartFilters and RENA Filstar xP1 through xP4 Canister Filters or by Patented interactive display LED lighting with "abnormal temperature" alert flashes fast when water Five models: 50, 100, 150, 200, 300 watt Made with high quality, durable and unbreakable plastic meeting UL standards. Safe to touch even whe Energy-efficient tubular design heating both internal and external surfaces of the heater