AquaStar Water Heater Warranty Information Page Return to AquaStar Main Page Warranty Information– AquaStar 125 and 38 Series water heaters are warranteed by the Manufacturer (Robert Bosch) through Controlled Energy Corp. CEC will furnish a replacement heat exchanger and replacement parts which fail in normal use and service within 15 and 2 years respectively. Attention New AquaStar Owners– You can fill out your warranty card on-line! HouseNeeds, Inc. Post Office Box 525, Warren, Vermont 05674 802-583-2726