The larger whole-house Bosch electric tankless water heaters now have non-replaceable black polymer modules inside. The larger whole-house Bosch electric tankless water heaters used to have sealed copper canisters inside but if one of the elements went bad they could not be replaced. The new Bosch whole-house electric tankless water heaters now have replaceable elements but the black polymer module is not replaceable.
You will want to make sure the location where the Bosch whole-house electric tankless water heater is installed is heated and the temperature never falls below freezing. All freezes are NOT covered by the Bosch warranty. These Bosch electric tankless water heaters do NOT have any built in freeze protection.
Below is a list of the Bosch whole-house electric tankless water heaters that have the new replaceable elements.
17 KW Units
Bosch Powerstar AE-115 (Poly) #45551701
Bosch Powerstar AE-115 (Tronic Style) #45551710
Powerstream Pro RP17PT (Poly) #45551702
Bosch Tronic WH17 #45551721
27 KW Units
Bosch Powerstar AE-125 (Poly) #45557701
Bosch Powerstar AE-125 (Tronic Style) #45557710
Powerstream Pro RP27PT (Poly) #45557702
Bosch Tronic WH27 #45557721
36 KW Units
Bosch Tronic 5000C WH36 #7736500680
For further questions or to purchase any replacement parts please call Global Protankless Supply at 866-289-4652.