BISELONG 2.5 Gallon Mini Tank Water Heater — 110-120V Under-Sink Instant Hot Water, 1.5kW, Stainless Steel

Overview

The BISELONG BI-2.5 micro tank water heater is designed to live under a sink, in an RV kitchen, or in a mobile food setup. With a 1.5kW heating element, it aims to provide hot water with minimal delay, making daily tasks like dishwashing or quick rinses more comfortable. The unit heats efficiently within a compact footprint, helping you maximize usable cabinet space while keeping a steady supply of hot water on demand.

Why this small heater might fit your space

Ideal for tight configurations where a full-size tank is impractical, this 2.5-gallon model delivers hot water without the bulk. Its 13.0" L x 11.4" W x 10.6" H profile makes it a practical addition to under-sink cabinets, small kitchens, and mobile setups where every inch matters. The white BIS02 appearance keeps the installation clean and unobtrusive.

• Rapid temperature recovery A laser-welded 304 stainless inner tank and a high-capacity heating element work together to reduce wait times for hot water.
• Energy-saving design An intelligent inverter minimizes standby losses while maintaining warmth, which can help lower energy waste when hot water isn’t in use.
• Compact and versatile Its square, space-saving form is suitable for under-sink installs, RVs, food trucks, or compact laundry areas.
• Easy installation Includes simple brackets, 1/2" NPT pipe fittings, and a fixed 10 AWG power cord for quick setup.
• Safety and reliability Multiple protections guard against overheating, dry heating, and leaks, with electrical and water lines kept separate.
• Durable upgrade The 2023 revision uses a thicker 304 stainless lining for extended service life and improved insulation.

What’s included and installation notes

Comes with handy installation brackets, 1/2" NPT fittings, and a fixed 10 AWG cord. It’s designed for 120V operation and a 15A circuit, with a recommended circuit breaker size of 20A for some setups. A professional installation is advised to ensure proper wiring, mounting, and safety clearances.

• Technical highlights 1.5kW, max 149°F, min flow 0.475 GPM, 108 PSI max pressure.
• Build and safety 304 stainless steel lining, CE/ROHS/FCC certifications, and multi-layer insulation.
• Usage notes Suitable primarily for sinks; read the user manual for detailed guidelines and installation steps.

Real-world use cases

Perfect for kitchens where a quick rinse of dishes or handwashing is needed without running a large water heater. It also suits compact living spaces—RVs, trailers, or small food-truck setups—where space efficiency and consistent hot water availability matter. While it can heat water for two sinks at once in short bursts, plan for steady performance within the stated flow and temperature ranges.

Quality and support

The line is backed by customer service with online support, and the product has undergone upgrades to improve insulation and durability. If you encounter issues or installation questions, reach out for guidance and confirmation of compatibility with your setup. Note: units purchased after July 4, 2023, carry a 2-year warranty according to the latest product information.