My eko is plummed into the return side of the gas boiler using closely spaced tee's. Just realized that when the rk2001 controller reads 40 deg it will turn on the circulator. This circulating water will excange some with the return water inside the house as it passes by the closely spaced tee's going back to the gas boiler. Sounds like good freeze protection but I don't know if I want to heat the 20 gallon of water the eko takes. What are your thoughts.