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vaillant combi boiler?

there is a red knob underneath the combi boiler to the right what does it do ?

evelyn
September 2007
VaillantHeating, Home Heating SystemsCombi Boiler Boiler Vaillant
it's the pressure relief valve.

hi-spec plumbing
September 2007

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Vaillant Combi Boiler Red Knob - What Does It Do?