How to drain a combi boiler find the drain cock and add inhibitor.

A video showing where to find the drain cock,empty the system , add inhibitor, bleed the radiators and re-pressurise the heating system. If you want to make your system more efficient and stop your system blocking up with black sludge, just follow my simple video.
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Видео How to drain a combi boiler find the drain cock and add inhibitor. канала dereton33