Would this heater be big enough?

[Schulks]

I have a IM Nuvo 50 EXT with Trigger Triton 20 Cube sump. I found a used Helio 2x100w PTC heater for a good deal. On IM's website it says 2x100w is good for 25-50 gallons. My total water volume is actually around 48 gallons. I'm not sure what number the chart is referring too..

With my 40w pentair UV also heating the water it will be fine but I'd like to know without the UV it will also be fine. I'll test if I buy ofc.
Right now I have 2x 200w eheim jagers but they are too big to fit where I want and I don't have a mount for them.

Should I bother trying the helios?

 

[Mr. Mojo Rising]

The old rule is 3-5 watts per gallon, I like to go with 5 watts per gallon. So 50 gallons (rounded up) x 5 so you should have at least 250 watts of heat.

 

[Schulks]

The old rule is 3-5 watts per gallon, I like to go with 5 watts per gallon. So 50 gallons (rounded up) x 5 so you should have at least 250 watts of heat.

Hmm, but I would fall in the middle of the 'old rule' range. With the UV the heater wont have to work hard.
I'm really trying to convince myself lol.