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Sorry I meant cylinder not boiler. Ok thanks. But how comes the water doesn't drain from the taps? I only emptied the top part of the cylinder via the taps and now I have to use the drainer for the bottom half. Is this half ever used by the taps if the top runs out of water or ?

Thanks for your reply. I forgot to mention, it's an unvented electrical heating system and it's an apartment not house with no central heating. There's a DOC attached to the bottom of the boiler that I need to use to drain the bottom of the boiler. I need to drain the heating system in...

hey every one, I have a SANTON unvented system model: TP150E. I need to drain all the water as I need to change the lower heater element. However, I am only draining it using the drain valve at the bottom of the boiler. I can't get pressure to take out the rest of the water inside. I think...