Background: I am installing a hydronic radiant floor heating system myself and getting all the information required is a combination of many different websites. It doesn't seem like there is an all-in-one site for what is needed.
I have an existing tankless (on-demand) water heater as the hot water supply for the house. I am looking to use a heat exchanger off of that to warm the water. I have 3 zones: upstairs master suite (1 manifold/2 loops); downstairs bedroom (1 manifold/1 loop); main living (living room 1 manifold/2 loops, kitchen&bathroom 1 manifold/2 loops).
Question I have created this diagram on how I am planning on hooking everything up. My question is everything in the correct location? Am I missing any components? The only thing I don't have in the diagram is the electrical wiring and the thermostats. Don't assume there is anything I am installing, but just didn't put in the diagram. Everything I know is on that diagram.