Black water coming out when vented Cold spots on radiators Continuous venting of radiators weekly or daily. Will travel all of Yorkshire. The item "Central Heating Power Flush" is in sale since Sunday, October 28, 2018. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Air Conditioners & Heaters\Radiators". The seller is "2010stevielewis" and is located in Normanton. This item can be shipped to United Kingdom.