Check the listing for details. 1.6 Gallon Under Sink On Demand Instant Electric Mini Tank Hot Water Heater. Color: White, Condition: Used, Made in China. Listed at 35.00 USD. The 1.6 Gallon Under Sink On Demand Instant Electric Mini Tank Hot Water Heater is a compact and efficient water heating solution perfect for various applications such as recreational vehicles, walls, indoor spaces, and even under sink areas. This tankless water heater operates on corded electric power with a voltage of 110/120V and features a white color design. With a heating system that provides instantaneous hot water, this unit offers safety features like dry combustion protection, overheat protection, high water pressure protection, and leakage protection. This mini water heater has a water temperature range of 86°F to 167°F and is designed for easy installation with a 1/2 inch NPT water connection at the top.