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i currently have a 100w heater in my 22gal and i think its failing as it has to be set to 32c just to keep it at 25 on the thermostat. just like to no if i bought a 300w one would that be ok or do i have to have the same again .

I have a 50w Ebo-Jager heater in one of my 20gal tanks and a 75w in the other and they both keep each tank at a nice temperature of 78-80deg F (about 25-27deg C).
Your heater may be faulty or badly calibrated. How's the water circulation in your tank? Where is your thermometer in relation to the heater? I keep mine on the other side of the tank from the heater....

Last edited by csfish at 27-Apr-2005 23:58

got 2 thermometers one next to the heater and one at other end of tank. iv got a spare 50w heater would i be able to put that in instead of buying a new one .

Another thing to consider is how different the air temp is from the water temp. 5wpg is given as the reccomendation for heaters, but obviously if the air is much colder than the tank you're going to need a stronger heater, if there's little difference you may be able to get away with a heater that's underrated for the tank.

Longer and larger tanks often need two heaters just to keep a consistant temp from one side of the tank to the next. You can try adding the spare 50w heater, however you may find that one of the heaters is trying to pull the load for both of them as was mentioned sometimes heaters arent calibrated properly.
If you're considering getting a new heater go with matching 50's or 100w's depending.

^_^
[hr width='40%']"I'm alright, I'm alright
It only hurts when I breathe"

i wouldn't overpower your tank that much. If it gets stuck on, your fish'll boil.

Also, it can change the temp of the water too quickly, stressing the fish. Get a properly sized heater.

I agree with fallout, you need a properly rated heater for your tank. Getting an overrated heater is really as dangerous (for your fish) as an underrated one.

Jim

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Water, taken in moderation, cannot hurt anybody. -- Mark Twain

yeah..i think the problem is ur heater..its faulty and time to change it..just buy the regular recommended heater for the size of ur tank.