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semi instantaneous steam/water heat exchanger

ross moore
ross moore Member Posts: 8
in THE MAIN WALL
Does anyone have any experiences good or bad with semi instantaneous water heaters that use steam to make hot water (similar to Aerco)? How do they compare to instantaneous heaters (typically a shell and tube exchanger with controls)? Some literature (propaganda) says that, compared to feed forward instantaneous heaters, some disadvantages of the semi's are: heating element/coils are susceptible to failure; although lower-cost, semi's are higher maintenance; semi's have a shorter service life. Does anyone have any thoughts or experiences on the matter?
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