Vaillant Unistor slow reheat

jasperfromcz · 17 Nov 2013

Hi All, I have a Vaillant Atmotop VU 200/2-5 and Unistor VIH Q 120 (7yo). The heating works fine and has recently been cleaned. The water however takes ages to reheat and during shower the water temp drops under 25 deg. I assume the heat exchanger has limestone on it but no inspection hatch to validate etc. How can I add limestone remover to the boiler? could this be done via the circulation connector on top of the boiler or is there a smarter way? P.s Since I can't speak czech I post it here..

Thanks, Jasper

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Vaillant Unistor slow reheat

jasperfromcz

DIYnot Local

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