Micro CoGen.

Here is the Laidong 4 cylinder engine.

Laidong is a state owned company. Been around for a long time. The engines are used in Aurora Generators. Both the 3 cylinder and 4 cylinder ones.  They have EPA Tier 4 approval by the way.  Aurora also carries all the parts for them in both Canada and the USA online and easy to order.  Jinma Farm Tractors are also using the same engine.

Here's some photos showing them being installed for Aurora.



This should also give you an idea of how small they are.



Lots more photos and video there.   I have additional photos but can't find a way of posting them here without hot linking.