I recently replaced the power head on a WR zone valve. The valve is working properly but since the change the heat, although hot, lacks any force coming from the base boards. I lost a small amount of water from the boiler when I replaced the valve and am wondering if I lost too much. If so how do I go about refilling the boiler.
Thanks. Chuck

There is usually a fill valve on the feed water line going to the boiler. There could also be a automatic fill there also. You will need to bleed the base boards also.