Cleaning the Heat Exchanger for the Bosch Greenstar should not be necessary for a few years after installation. But when it's time to clean it, use the heat exchanger brushes, cleaning blades, and replacement gaskets included in this kit. Contents include enough for 5 cleanings.
Greenstar cleaning kit for Combi boiler ZWB-42-3 consisting of:
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Hi Beverly. Yes, this will work with Bosch model ZWB-28-3A.