The powerwatt of PTC water heater (PTC liquid heater) varies with application condition, it shall requests the heated water have good flow for PTC Heating. There are 3 kinds construction of PTC heating, Flow through PTC Water Heater / Steam Generator, Build-in PTC liquid Heater, Liquid Container Bottom heating.

For Flow through PTC Water Heater, water flow through middle flow channel, PTC Heater directly heat flow water. Two available designs are single-pass and multi-pass systems.
Operating voltage: 12-240V
Insulation voltage withstanding: > 3750V
Surface temperature: 180-265C
Rated Power watt: 50-1000W
Power-watt density (Heating power-watt per water contact area): approx. 4-10W per cm2 (water temperature @25C)