# Second heater to handle low room temperature

lenduha
Hi,

I have a 15 Gal tank with fantail goldfish, albino cory and brittlenose pleco inside it. During christmas, I will not be able to heat the room the fisk tank is in and expecting the room temperature to be close to 10 Celcius degree (10-15 at most). I have a Fluval E50 (50 Watt) at the moment and set the temp to 24 Celcius degree. I wonder if I have to put a second one to compensate the room temperature, the big gap between seems to be pushing the limits of 50 Watt heater for 15 Gal tank which is at the edge of being enough? Also, any good suggestion for the second heater (was planning to buy something small like 25 W or should I for another 50 W)?

Thanks,

Flyfisha
I would say everyone that can afford it should have a spare heater in storage ready but not in the tank.

I believe the heater you have is perfect for the job.
No action required.

My town has -8 degrees centigrade nights even though I live in sunny Australia.

FishDin
Here's a heater calculater based on room temp and water volume.

lenduha
Here's a heater calculater based on room temp and water volume.
FishDin I could not see a link if you've already sent one. Actually, calculator(s) I tried suggest me something bigger than 50W (at least 75 or even 100) in order to keep 24 Celsius degree when the difference between the target and room temperature is more than 10 degrees. No chance to make a real test to see how well my heater can cope with that situation, so decided asked for experiences.

Actually, I am really thinking about putting another 50W besides it and test for a week, so I can safely leave them behind.

Flyfisha
I am wondering if there is a difference in the effectiveness of a 110 volt heater compared to the 240 volt heaters we use in Australia?

I am glad others have stepped in with their suggestions and glad no fish were harmed.

briangcc1997
I've done something similar...

This past spring/summer we setup a patio pond in one of those Rubbermaid totes - 54 gallons, round. I originally had a correctly sized heater and set it for the low end of 68 degrees. That single heater could not keep up with the outside temps. I added a second, exact same manufacturer, size, and set the temp the same. No more wild temp swings at night.

So in short, yes it can be done effectively.

FishDin
FishDin I could not see a link if you've already sent one. Actually, calculator(s) I tried suggest me something bigger than 50W (at least 75 or even 100) in order to keep 24 Celsius degree when the difference between the target and room temperature is more than 10 degrees. No chance to make a real test to see how well my heater can cope with that situation, so decided asked for experiences.

Actually, I am really thinking about putting another 50W besides it and test for a week, so I can safely leave them behind.
This one is from FishLore: Aquarium Calculator - Fish Tank Volume, Heater Size, Chiller Size & More!

Heater & Chiller Sizing Calculator

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