Ariston Andris 4 Gallon 120-Volt Corded Point of Use Mini-Tank Electric Water Heater Price: $179.99 (as of 30/11/2022 11:13 PST- Details)

Make sure this fits by entering your model number.
Compact design; wall or floor mounted (wall bracket included)
Provide immediate hot water at the point of use; install as booster or standalone