Irvine, Calif. — Navien has started shipping the new NHW-A non-condensing tankless water heater. NHW-A is available in two configurations: NHW-AI for interior installations and NHW-AE for exterior installations. Both the NHW-AI and NHW-AE are offered in 160,000 BTU/h, 180,000 BTU/h and 199,900 BTU/h sizes in either natural gas or liquid propane fuel operation. NHW-A Read more