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Vokèra DHW not always getting hot

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scoz

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Vokera 80 sp hot water is hit and miss but CH is Woking fine, domestic diaphragm and thermistor have been changed but it still is the same. DHW will heat up fine then the next time it runs cold constantly.
 
Need a gas safe engineer out mate
 
I’d be inclined to rip that prehistoric contraption out and fit a modern efficient boiler.
 
Not a vokera lover at all but that one was not bad .

Gas safe eng required
 
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