Vaillant hot and cold shower

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31 Dec 2014
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Hi wonder if anyone gave give me some direction with this ... my central heating is fine, but in the shower (mixer taps) the water is hot for a minute or so, but then runs cool (but not cold). If I turn the hot water off, wait a few seconds then turn it back on the water flows cold for a time (as you would expect) and then the hot water flows as it should (reasonably hot). Would appreciate help! Thanks.
 
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Does the water run hot and constant at the other taps?
If the mixer isn't thermostatic then it's always going to be a bit erratic.
 
Thanks James. Yes downstairs the water runs hot without cooling at all. Upstairs I can't run a bath full of hot water. Both come from the same source!
I hadn't considered a thermostatic mixer..
 

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