Two heaters different wattage?

Would it be OK to use two heaters in my sump (in different areas) if one is a 150 watt and the other is 50 watts? It's more for peace of mind. When I had my 75g I used two heaters at the same wattage (which I'm sure is ideal).

Anything bad about two different wattage heaters?

 

It's not so much the wattage as much as the thermostats that need to be matched.
I suggest "staging" the heaters since without a temp probe or digital thermostats, setting two heaters to the exact same temp is very difficult.

I also see you are in Wisconsin. You may want to up the wattage a little bit of your heating capacity in terms of watts/gallon. The 150 watt heater is only giving 2 watts/gallon of heating power. I only live in NJ and found that even 3 watts/gallon was a bit low.

Currently running 800 watts (3 heaters) on a roughly 160 gallon system for about 5 watts/gallon. The idea being that if you are constantly straining the heaters by running them for long periods of time - your efficiency and heater life go down.

At a lower wattage/gallon you may find larger temp swings in cold weather (unless your home is 100% perfectly climate controlled - which is certainly possible - but the heaters will be a "failsafe"). Also as I said before the lower power means longer run time which means less efficiency and higher failure rate.

So back to staging - the larger heater should fire first and you should set the smaller heater just below the set temp of the larger heater so that the smaller one is never responsible for the full heating load - only what the other heater cannot make up for.

Hope this helps.

 

I'm currently running two in my tank. One 300w fluval e-series and another cheapo 150w. Won't hurt a thing. One could always serve as a back-up if the other fails to heat.

I have then set a bit staggered in terms of settings. The 300 is set for 79.5 and the 150 set for 76. The 300 does most of the work but keeping a tank at 79.5F in a room that's as cold as 55F ambient during winter is a tough job

 

Thanks guys--that makes sense as far as the matching goes. My new Jager is getting adjusted and I may need to put the temp up a bit. The other heater I use only for heating up a new saltwater mix the day before it goes into the DT.