i bought 2 the unit that comes with the system and a replacement to have a total of 700watts at once. my tank is 200 gallon with the sump volume maybe 210 i cant get a single heater to get the tank over 21.1-21.5 celsius with the second 300 watt heater in it still cant get above 21 degrees the heaters are constantly on to keep a temp of 21. i may going to try switching to 500 watt heaters and see if i can get the tank to 25.5 celsius 78 fahrenheit where the tank temp should be. if you system is this size i recommend getting the 500 watts heaters to start or the 1000 watt heater if you only want to have one heating element in the tank.

très bon produit

No es muy preciso pero funciona bien. Una buena compra

very good

ottimo prodotto