The heater works really well... but I have it on my 40g with a Jebo 838 as well, and I feel like those together are doing an adequate job. You may have to go bigger for your 180.
I was saying if those two Eheims were your only filtration, you would probably need more. You could always try micron filter pads to polish the water if you want it clear.
the two 2128s may be more then enough filtration for your 180. A lot will depend on what and how much fish you stock. Biologically you will not have any issues, you may find that the mechanical filtration is lacking though.