Village Plumbing was in Chevy Hills, had a call from a customer that was referred to us from Takagi Tankless Water Heaters. We have certified technicians available to work on your water heaters. Village Plumbing went out to Chevy Hills, and found that the heat exchange needed to be replaced- will need to remove and replace. We also recommended to the customer that they should install a water treatment system for there water heater. And customer agreed to have the circulating pump install too.