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

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-- A video showing where to find the drain valve ,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. For more plumbing and heating tips visit my website at www.dereton33.com