4 Gallon Point of Use Under Sink Water Heater - 120V

Instant Hot Water Where You Need It

The Thermomate ES400B 4-Gallon Mini Tank Water Heater delivers immediate hot water right at your sink, eliminating long waits and water waste. With fast reheating and high-density foam insulation, it provides efficient 24-hour standby performance.

Easy Installation

• Plug-and-play: Simply plug into any 120V outlet.
• 1/2" NPT water connections for easy setup.
• Flexible mounting: Install under the sink, on a wall, or floor-mounted as needed.
• CSA-certified Temperature & Pressure Relief Valve included for safety.

Compact & Space-Saving

With a sleek and compact design (12.6"W x 12.4"D x 24.3"H including valve), this mini water heater fits perfectly under sinks in kitchens, bathrooms, RVs, cabins, or even small offices—saving valuable space.

Durable & Reliable Performance

• Enamel-coated glass-lined tank ensures better insulation and prevents leaks.
• High-quality CASH USA-made T&P relief valve for added durability.
• UL certified, ensuring a long service life with safe operation.

Versatile Use

• Standalone: Use as a dedicated point-of-use water heater.
• Booster Mode: Connect in-line with an existing water heating system for extra hot water support.
• Adjustable temperature range: 68°F - 140°F with an easy-to-use control knob.