An Onan 7K NHM will also fit in the same space. Both are twin cylinder, 60 cu. in. engine. 1800 RPM.
I suspect the NHE is a more pollution free version of the NHM. Thus 0.5K less out put.
Richard
95 Bounder 32H F53 460
2013 CRV Toad
2 Segways in Toad
First brake job
1941 Hudson