Also We have hot water radiator heat in the house. The radiators are old and the water does not flow evenly through all of the system. We have a brand new furnace and hot water heater combination. When it was installed last January they bled the lines but we still have irregular heat. Is there a valve to add to the radiator like you can do for steam heat. Or is there a pump you can put along the way to increase flow. The main problems appears to be in the newer section of the house !950 as compared to 1850 the older section.