Use the WebStone 44443WPR Isolation Valve Kit for any tankless water heater
The 44443WPR is Certified Lead-Free and comes with 3/4" threaded connections. If your water heater has 1/2" water connections, then you should supply 3/4" to 1/2" bushings.
Consists of a set of full port forged brass ball valves with high flow (500 WOG) hose drains, for hot and cold water connections, and includes pressure relief valve outlet (150 psi/200k BTU).
NPT female threads are on both ends. Requires male NPT for connections.
3/4 IPS lead free isolator EXP E2
Warranty: Webstone warrants all of its products for manufacturing defects in material and workmanship for the life of the product, provided they are professionally installed and operated normally. Webstone will also reimburse the installing contractor $50.00 to help cover the cost of replacing any defective ISO valves. Contact Webstone for complete details.