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Vokera Compact 28 Combi DHW problem

Joined
6 Jan 2007
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Location
Yorkshire
Country
United Kingdom
Vokera Compact 28 Combi installed 2 years ago, recent problems with DHW, will provide hot water to taps etc for a short period then water goes cold for sometime then comes hot again. No problems with CH. Live in a hard water area. Not sure if its the secondary thermistor or heat exchanger scaling up. Flow rate appears ok. No water treatment system on water supply
 
Sounds typical of a blocked secondary HE.

Tony
 

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