need advice please

[SaltyDog143]

Ok i have been having some trouble finding a heater for my system, the compartment in the sump that it will be in is 13.5" x 10", with 8" of water, i would prefer a submersible (of course) that will fit into this compartment. Any suggestions?
The heater and pumpwill be in there together, which brings me to my next question.....

I could really use some suggestions on a reliable pump thats fairly quiet, its a 120gal tank 50 gal sump with approx 30 gal of water, and a 5' lift from sump to tank top.

thanks in advance
Randy