220-240V 50Hz, 2,800W (at 20°C). Heats the pool water by about 0.5-1.5°C (depending on the water volume). Suitable for pools with a water capacity of 1,520-17,000 liters. Compatible with filter pumps and sand filters with a flow rate of up to 3,785 liters per hour. CE, GS, and TÜV approved. Suitable for the following Bestway Flowclear pumps and sand filter systems: Bestway item 58145 (pump capacity 1,249 l/h), Bestway item 58148 (pump capacity 2,006 l/h), Bestway item 58271 (sand filter pump capacity 2,006 l/h), Bestway item 58117 (pump capacity 3,028 l/h), Bestway item 58257 (sand filter pump capacity 3,785 l/h).