Heater combination for 75 gallon tank

[jb61264]

Wondering what dual heater combination I should get for my 75 gallon tank with 55 gallon sump. I've always heard that you should use two smaller heaters instead of one bigger one in case of a failure.

What size should I get to have two running?

 

[lostintheocean]

i have a 72 bow wiht 20 gal sump, i do not run a heater and have no issues.

 

[aquaman67]

At 3 watts per gallon you should run two 200 watt heaters.

 

[thegrun]

I would think two 150's would be fine. You probably have less than 100 gallons total in your system.

 

[conorwynne]

I run a single 150watt in my 120G. The temp is stable at 80F, in the winter I have a second one on standy otherwise the single can run all the time. If I notice a temp drop, I flick the switch on the backup.

The current temp here is 18C or 64.4F, and no issues running a single heater. It varies from day to day in Ireland, last week it was close to 30C (86F), this week it's 14 to 20 celcius.