Yeah the drawing isnt the best. The recirc line comes from the farthest sink and is a proper loop, just didnt draw everything past a certain point. Also the hot and cold lines coming off of the heaters are going in and out the correct places, it just looks reversed b/c I was trying to make the drawing easier to see.
What I was thinking was that it made more sense to have the loop coming into the cold line. I wouldnt have to buy anything extra to do it, just move it. Do you think it makes a difference if it came in from the cold line on top or from the drain valve? To me I dont see the difference unless I was trying to do gravity feed and then it would have to come into the bottom.
I do have a check valve on the return loop. Thanks for the responses.