Hydor inline heater - Flow reduction?

I have an external CO2 reactor in the return line from my XP3, and I couldn't detect any flow reduction when I first set it up. I'm sure there is some reduction, but it must be small. I don't have any experience with Hydor heaters though.

 

I have a Hydor 200 installed recently and all I can say is it workes pretty good with only 0,3° C between ON and Off. There must be some flow reduction but it seems to be very little.

Best regards,
Detlef

 

At the moment I'm not using any heater at all. I let the lights heat up the water a little during the day, then rely on the thermal mass of the water to hold a high enough temperature during the night. When I used a heater, actually a couple of them at different times, they would not set a temperature that I wanted. My tank kept running at 80F or more, with the heater refusing to shut off. I avoided a disaster only because I refuse to use big heaters, preferring to experience somewhat high temperatures with heater thermostat failure rather than making fish stew.

 

75 gallons of water is going to be pretty stable in temperature no matter what you do. It takes a lot of energy to raise or reduce the temperature of that much water, and whatever change happens will be slow. Of course if you don't keep the room the tank is in heated to 70 F or so, it is possible that the temperature will eventually drop too much. I just keep my rooms around 66 to 75F year around.