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Mend Sabre Combi Flow Rate Heating

Extremely low hot water flow rate on Sabre Combi Boiler?

I have a Sabre Combi Boiler in a 3 bedroom flat on the 2nd floor of a low rise block. Cold water flow rate is very high, but the hot water flow rate is just a trickle. The Sabre Combi boiler provides good heating for the radiators but negligible flow rate/pressure for hot water from all taps. What could the problem be here?
I don't know the model of the boiler.

Peter
April 2007
SabreHeating, Home Heating SystemsCombi Flow Rate Heating
Thanks for the quick reply. What ball-park figure should I be reasonably expecting to pay someone to get this repaired. Can it be repaired?

Peter
April 2007
dhw heat exchanger blocked

hi-spec plumbing
April 2007

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Sabre Combi Boiler: Low Hot Water Flow - Help!