Danfoss MTCV DN 20 version A — multifunctional thermostatic balancing valve for the circulation loops of domestic hot water (DHW) systems. The self-acting thermostatic element throttles the circulation flow as the water temperature rises toward the set point, holding a near-constant temperature in every riser and cutting circulation pump energy and heat loss. Version A covers the thermostatic-balancing function over a 35-60 °C setting range (factory set 50 °C). Body Rg5, PN 10, Kvs 1.8 m³/h, Internal thread ISO 7/1Rp ¾ connection, approval ACSPZH. OEM P/N 003Z4520. EAN 5710104092119. Technical data quoted verbatim from store.danfoss.com (code 003Z4520).