ThermoMate ES250 Electric Mini Tank Water Heater – 2.5 Gallons, Under-Sink, UL Listed

Overview

Meet the ThermoMate ES250, a compact electric mini tank water heater designed for point-of-use hot water. With a 2.5 gallon capacity and a 1440 watt 120V setup, it sits neatly under sinks or inside cabinets, ready to respond when you open a faucet. The unit emphasizes practical warmth with a 50–149°F adjustable range and a 30 mm thick, CFC-free polyurethane insulation layer that helps maintain temperature between uses.

Why it matters

Having hot water close at hand simplifies daily routines like dish rinsing, hand washing, or quick cleanups. The ES250 is built for fast recovery, so you can enjoy hot water sooner rather than later. Its compact profile and simple plug-in design make it a flexible option for limited spaces and varied settings.

Key capabilities

• Hot water on demand with a fast recovery suitable for small kitchens or bathrooms.
• Adjustable temperature from 50°F to 149°F to fit different tasks and preferences.
• 30 mm thick insulation reduces heat loss, helping water stay warmer longer between uses.
• 3-layer tank with fused porcelain enamel lining protects against corrosion and leaks.
• Incoloy 800 stainless steel heating element offers strong corrosion resistance and stable heating at high temperature and pressure.
• UL Listed safety features with a temperature and pressure valve to guard against excess pressure or temperature.
• Compact dimensions and mount options for versatile installation: wall or floor placement.
• 1/2 inch NPT water connections and a plug-in 120V power cord for straightforward setup.

Durability, safety, and design

The ES250 blends a modest footprint with sturdy components. A fused enamel lining and an extra thick anode rod support long-term heating efficiency, while an inline safety valve helps manage pressure and temperature. The combination of Incoloy 800 elements and corrosion-resistant construction is designed for reliable performance in everyday use.

Installation and use cases

Designed for kitchens and bathrooms at home, as well as mobile or compact spaces such as RVs, boats, vacation cabins, food trucks, garages, or small shops, the ES250 offers flexible mounting and a plug-in setup. Its 2-foot power cord and standard 120V outlet simplify DIY installation without specialized wiring.

Specifications and warranty

Dimensions: 12.95 H x 12.95 W x 11.5 D inches; Weight: 15.4 lbs. Electrical: 1440W at 120V; Max water pressure: 150 PSI; Nominal current: 12A. Warranty includes a 3-year tank coverage and 1-year parts warranty, plus 24/7 customer service to assist with setup and use.