The Truma electric boiler takes a very long time to heat – why?
The Truma electric boiler can take a long time to heat if the water container is calcified. In this case, decalcify the water container with commercially available products, such as citric acid or vinegar essence. Products containing chlorine are not suitable.
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If you have a question about an appliance, always have information about the appliance type, year of manufacture and factory number at hand. You'll find this on the type plate on the appliance.