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I was at a call that has a RINNAI 2532C, The boiler is feeding therm. mixing valve for domestic hot water and brazed-plate heat exchanger to give heat for a baseboard loop. There is a bronze pump that continuously circulates the boiler water through the heat exchanger. My question is, can a brazed-plate heat exchanger be used with this boiler ? and when I run the tub after a few seconds it runs out of hot water, but the shower stays hot.