The Andrews MAXXflo EVO 6‑bar unvented system kit is designed for use with 30, 60, 90, and 120kW condensing water heaters. Compatible with models CWH 30/201, CWH 30/301, CWH 60/201, CWH 60/301, CWH 90/302, and CWH 120/302, this kit includes a one‑piece inlet control, expansion vessel with bracket, temperature/pressure relief valve, tundish, and through‑flow valve.