Here are some comments/questions.
- The diagram has both pumps labeled as P1.
- Same Question as mattd2, what is the purpuse of the manual valve before P2 Inlet.
- Are you planning on recirculating the HLT water?
- Is the CW - cold water? as in your water supply? If so, why is there an additional one on the BK?
- Are you using a cooler?