What is a Primatic system?
This is a name given to what is properly termed a single feed cylinder, which is an arrangement whereby the central heating expansion is taken up by an air bubble within the cylinder. To identify a Primatic cylinder use the following check list: Hot water cylinder fitted (airing cupboard) – YES Cylinder is labelled Primatic / Single feed cylinder – YES Cold water tank in loft – YES Second small open tank (F&E) fitted in loft/airing cupboard – NO Combination boiler – NO Solid fuel stove/boiler – NO Filling loop, valve and pressure gauge to fill radiator system – NO If you get an alternative answer to any ONE of the above questions to that stated, then you are likely to have a Primatic cylinder and you must NOT use any Fernox product.
