Hi everyone if u can help me I be glad. My systems that heat the house I can ask for hot water I have a bad set up because when I ask for water it heats the water and four rads leaving one rad without heat and it heat the water. when I put on ch/hw I heat the whole house but I can heat upstairs on its own and downstairs. But there a few faults with that as there two pumps and a valve one pump is wried back to boiler that heats the water and four rads the others pump is wired to a switch long with the value both on the same line as pump goes on heats one rad downstairs and I turn on the other switch heats upstairs so I need turn on the pump to send some pressure upstairs so does make sense. So I want to put a valve at the tank that the boiler that send the water to heat the tank and back the return to the boiler. Take a look at the set up I took a picture