Check the listing for details. TWHXR3-HEAT EXCHANGER COMPLETE ASSY U245-2240 for RINNAI RL53i TANKLESS WATER HT. Condition: Open box. Listed at 250.00 USD. 856 This Heat Exchanger looks great but it has not been tested. This should be a great deal even if you should only use it for Parts. Seller's Disclaimer: Regardless of the origin of the equipment purchased from the Madison Co., the documentation provided or identification appearing upon this equipment, the equipment described and offered is in no way certified for, recommended for, or offered for any specific use. The purchaser agrees that the seller shall not be held responsible or liable for any injuries, death or damages to persons or property, whether incidental or consequential, associated in any way with this equipment. The purchaser, by purchasing this item(s) or equipment, indicates their acknowledgment of, and agreement to the terms of this disclaimer. It is the purchaser's responsibility to have the item inspected, certified and installed by a qualified professional before any use!