Question #1:
Accessory Water pump setup:

I got this "Magnetic driven, Seal-less, Circulating pumps, 12/24v dc pump rated for hot liquid, 15L/min"
from ebay.

http://i16.ebayimg.com/06/i/000/86/d0/28f7_1.JPG


I wonder if it's possible to plumb this pump upstream of my automatic radiator to the 2 extra in/out tubes at the bottom to make warm, if not hot water with the engine running, is this possible?

If so, I guess I could also make a Y to diver the stream into 2 right after the pump, one goes to radiator for making hot water & the other one straight to the tap for cold water. In the end, they all go to the hot/cold tap of the sink/shower in my camper.

I tested the city water flow from kitchen water tap was 8L/min, this 12/24v pump says 15L/min & , i guess that's plenty enough? (I haven't measure the shower water flow though...)