VEVOR Manual EV Charging Switch, NEMA 10-30, Splitter Switch for Dryer & EV, 24A Max 240V Manual Power Distribution with Circuit Breaker, Real-Time Display, Hand-Operated Selector, Plug and Play, ETL

Yes, it is compatible with a 240V water heater as long as the heater uses a NEMA 10-30 plug and does not exceed a continuous load of 24A. If this answer does not resolve your issue, please contact us again for assistance.