Heating Large Tanks

JosephJ

New member
I'm setting up a 300 gallon mixed reef and will be running two heaters in case one fails. I was leaning toward two 500 watt heaters. Does this sound like enough or should I go with something stronger like two 800 watts?

Thanks

Joe
 
Assuming you are not a polar bear, and maintain you room at typical ambient temperatures, 1,000 watts should be more than sufficient. In fact, I run a similar sized system on 600 (dual 300s).
 
^yep..
I always go by 3 x volume to keep a tank up to 10 deg over room temperature..
1000W is plenty..
 
be sure to slightly stagger the trigger temperatures for each heater. so if its really cold one will be on 24/7 and only the 2nd will be turning on and off. This keeps the temperature very steady.
 
I use 2 x 300w ramping led lights for my 220g aquarium.

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I have a 260 gallon QT system located in my warehouse. It gets really cold in the winter. I kept having to add 300 watt eheim heaters until I arrived at 7. It takes 7 - 300 watt heaters to keep my QT tank from dropping in temperature. I've been looking for a solid high wattage heater, unfortunately there doesn't seem to be a lot of info out there about high wattage heaters. I have no idea which one would be most reliable. Looking for input if anyone out there has experience with one.
 
It depends on few things:
- The difference between the target temp and the ambient temp
- Thickness of the glass
- Whether the tank covered or not.
- The sum of heat produced by equipment

The first and last one are the most important. Equipment and lights can add from 5 degrees to more than 15 degrees. The larger the difference of the target temp and the ambient temp, the bigger the heater you will need.

2 800W should be minimum, unless you are located in the south. If you are in the north, you may need bigger heaters.
 
I have a HVAC Vent above my sump aimed at the water Surface. As well as in the display tank there is a hvac vent next to the tank. I put a 3 inch pipe from that vent up into my Canopy.. We keep the house stat around 72-74 deg year round.. The tank stays about 77 in the Day and can drop to 75 lowest at night... I have two 500w heaters but they almost never come on. Same for the 1 hp chiller . There is now about 400 gallons plus water in the system.
 
Best heater is the accidental heater, I used to run dual 300 watt heaters for my 120, I would only run the heater in the house in the morning for about 30 minutes to get the chill out of the air. SO I replaced my Laguna 900 return pump with a Iwaki 30 Jap Pressure pump I removed one of my heaters and elec rate went down in the winter. we have a tier elec system.
 
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