Recently had a Viessmann Vitodens combi boiler installed, quite often when the adjacent cold mixer tap is opened the boiler starts for a few seconds!
Can anyone tell me what is causing this?
And how to cure?
Milky hot water. Recently had a Viessmann 100-W combi boiler installed. Now when the hot water reaches any tap it is very 'milky'. This appears to be micro bubbles and clears, upwards, in a few seconds leaving no residue. Though this is a hard water area in 45 years have never had this cloudy...
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