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Volvo Penta Calorifier / Water heater

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We have a one of the original VP calorifiers for fresh hot water from back in the day that Volvo sold/made them

When we upgraded the engine from the raw water cooled 2003 engine to the D1-30 we didn't reconnect the calorifier due to the fact that we didn't want to start pumping the coolant through pipes that were contaminated with salt water. 

What's peoples views on the possibility of flushing the heat exchanger, maybe with salt-away and heaps of fresh and starting using it again on the d1-30? 

Or should we just be looking at replacing it so as not to risk harming the engine inners with residual salt? 


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