I have a Ecnoburn and 500gal of pressurized storage. If the house is calling for heat, the tank does not charge and vise versa. I have a danfoss valve that prevents cold water to return to the boiler. The problem I have is that the house can be satisfied with heat (thus storage is charging) but it takes forever for the storage to charge because the danfoss restricts flow back to the boiler until the tank water reaches 140. The boiler will actually sit idle because of this thus reducing efficientcy. What am I doing wrong here?