We have just had a Vaillant ecoTec plus 832 installed. This is a 32 kW rating with a 13 liters per min flow rate. This was the recommended spec from the installer. But it would appear that only one tap can be used at a time (this is worse upstairs). Filling the bath for example means that any other hot tap is reduced to next to nothing. I understood from the installer that this boiler should cope with running two outlets at one?
I suspect the problem may lie with the mains supply or pipework.
Measure the delivered flow to the bath, e.g. by timing how long the hot tap takes to fill a bucket. Compare that with the 13 litres / min that your boiler is supposedly capable of delivering.
If the system has been converted from a traditional storage tank, the pipe sizing may allow the bath tap to starve the other taps in the building. If this is the case, the cheapest 'solution' is just to open the bath tap enough to get 6.5 litres / min leaving capacity spare for the other taps.
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