View Full Version : 300g heater recommendation

07/21/2014, 09:18 AM
I starting to finally fill my 300g that I've been working FOREVER on!

With that.....I need a heater. What do ya'll recommend for a heater, both brand and wattage? I'll be running a Reef Angel controller if that makes a difference, as I know some heaters need a temperature controller and others don't. My house stays a constant 71 degrees, I'll be running LED's, and a Reeflo Dart return along with (2) Jebao WP-60's, so not much to add heat to the tank.

I want to buy online today so it'll be here by the weekend when I need it.


thanks in advance!

Robb in Austin
07/21/2014, 10:00 AM
I haven't run a heater in years. I'd recommend just observing and only add one if truly needed. We keep our house at 72-74, depending on the mrs, year round and my water stayed at 78 when I had my 75g with t5's. I just setup a 215 with LEDs but haven't checked the temp on it. I'll do that at lunch and report back.

I do have an Eheim 1260 as my return which probably adds a little heat.

07/21/2014, 10:55 AM
I see what you're saying. I'm at work for the next few days out of town, so I'll see what the temp is when I get back home. I'm thinking maybe a 3-500watt heater just in case should do the trick.

Eheim? I need something that can be fully submersible for when I kill the return pump for maintenance and the sump fills up higher than operating level.

Robb in Austin
07/21/2014, 12:27 PM
Just checked: 77F. My lights have been on for about 3hrs now but only running at 20% (still in acclimation mode from the T5s).

I've got 2 Jebao RW15's in for flow.

The Eheim is submerged all the time. It's a great return. Been running esentially nonstop for the last 4 years without maintenance without a hiccup. (I did give it a cleaning here 2 months ago when my 75g sprung a leak.)

07/21/2014, 12:50 PM
Recommendations for wattage and brand?

Robb in Austin
07/21/2014, 01:12 PM
Sorry, can't help on the heater question more than the titanium ones seem to be best.

07/22/2014, 08:46 AM
Check out finnex from BRS... I use 500 and 300 on my 360 gallon. With the apex I set the 300 to come on first and if the temp drops just a tenth more the 500 comes on too. The apex controls on and off by switching the outlet. This system has worked very well for me...

07/22/2014, 09:29 AM
Ehiem Jagers for me. You will likely need more than one of them. They are really reliable.

I would rather have multiple small heaters than one large one. A 1000W heater can bake a tank if temp probes, or like automation, stick on. If a single 300W sticks on, then my tank will get warm, but cannot get more than 80. Having a controller really helps as well with dual sensors.

I have a 320G system here in Colorado and it takes 4 300W heaters to keep it warm in the summer - evap and 50-60 degree nights don't hold the heat very well. In the winter, I have to add 2 more. This is 1800 watts. Not sure what the Reef Angel can handle, but I have to use a more commercial temp controller - currently have Ranco and a few old school Medusas. In 'bama, you might not have this problem in the summer... but you might need 3-4 heaters in the winter.

07/22/2014, 10:32 PM
I live in MN and the temp in my house stays around 70 year round. I use 2 300 watt Eheim Jagers. They work great for me.

07/22/2014, 11:00 PM
I have used nothing but the eheim-jäger heaters for years - never have had reason to change. OK, they wear out eventually, so I keep a spare on hand.

lhm nole
07/23/2014, 12:14 AM
I live 60 miles from you and have never used a heater on my saltwater tanks...I have a 300 reef right now and it stay 78 all year round of course I keep my house temp 73 all year round

07/24/2014, 08:08 PM
I like my Eheim Jager heaters. They work well and are reliable.

For a 300 gallon tank, I would suggest 2 x 300 Watt.


07/24/2014, 09:12 PM
Unfortunately the Eheim Jäger heaters just don't have the same quality they once did...

07/24/2014, 11:02 PM

08/26/2014, 01:34 PM
I use my hot water tank to send hot water through flexible tubing controlled by my apex. I've ran it that way for years now, I had 4 400w heaters that would be on almost 24x7 to keep it stable now its perfect and about no cost as my water tank turns on all the time for washing, sinks etc.

04/24/2015, 10:53 AM
Hey john sorry this is off subject but it wouldn't let me private message you. I see you are from Brighton, MI and I found a Craig's list ad from Brighton of someone selling 3 tanks a 120, 300, and 600 but I can't get ahold of them and they didn't post a phone number and won't respond to CL email reply. Would you happen to have any idea who this is or how to contact them as I'm traveling out that way tomorrow from Iowa and would like to purchase one. Any help would be greatly appreciated, thank you! I can be contacted at [email protected] or 563-554-7199

04/24/2015, 05:01 PM
I like the Finnex Titanium heaters I run a single 300 watt on a 120 hot ( summer) and mild(winter) state here. So I would try a 300 for now I also have mine on a Ranco controller.