ThermoMate Mini Tank Water Heater – 4-Gallon Under-Sink, Instant Hot Water, UL Listed ES400

Efficient hot water at the tap, exactly when you need it

The ThermoMate Mini Tank ES400 is a compact 4 gallon electric water heater designed for point-of-use installations. It delivers warm water quickly, featuring a fast recovery that minimizes wait time and reduces standby heat loss. With an adjustable temperature range, you can tailor warmth to your tasks without guessing the faucet temperature.

Compact design that fits tight spaces

Measuring 14.5 by 14.5 by 12.9 inches, this unit is engineered to tuck neatly under sinks or near workstations. It supports both wall and floor mounting and plugs into a standard 120V outlet for simple, plug-in power. Its 1/2 inch NPT water connections and a maximum rated pressure of 150 PSI make it compatible with typical residential plumbing while keeping a low profile.

Durable, efficient heating for lasting performance

Inside the tank, an Incoloy 800 stainless steel heating element resists corrosion and facilitates effective heat transfer. An enamel coated glass-lined interior improves insulation and helps prevent leaks, while UL listing reinforces a focus on safety and reliability over time. The combination is designed to support long service life in active use environments.

Flexible temperature control for everyday use

Choose a comfortable warmth with an adjustable range from 50°F to 149°F. This flexibility is ideal for quick hand rinsing, dishwashing tasks, or supplying modest hot water at nearby sinks without committing to a larger system.

What to expect in daily use

• Instant hot water at the point of use with a 4 gallon tank
• Compact footprint suited for under-sink installation
• Wall or floor mounting options for flexible placement
• Low standby heat loss contributes to efficiency
• UL listing and a CSA T&P relief valve for safety

Specifications and warranty at a glance

• Electrical: 1.44 kW at 120V, nominal 12 A
• Water connections: 1/2 in NPT
• Max water pressure: 150 PSI
• Dimensions: 14.5 H x 14.5 W x 12.9 D in
• Weight: 19.8 lbs
• Includes: 2 ft power cord, plug-in ready
• Warranty: 3 years with 24/7 customer service

Note that performance depends on incoming water temperature and usage patterns. The ThermoMate Mini Tank offers a practical, space-saving solution for immediate hot water needs without promising guarantees, allowing you to explore possibilities for faster, more convenient water heating in smaller spaces.