Fisoceny 4 Gallon Under-Sink Water Heater – Instant Hot Water, 1500W, 120V, Release Valve, 3-Way Diverter Valve

On-demand hot water where you need it

Designed for compact spaces, the Fisoceny 4 Gallon Tank Water Heater delivers warm water quickly at the point of use. Ideal for under-sink installations, small kitchens, RVs, campers, and tight offices, it brings comfort without occupying precious space.

Fast heating and quick recovery

Enjoy high efficiency and a rapid hot-water flow. With roughly 95% thermal efficiency and an efficient L-shaped heating element, hot water can arrive in about 5–10 minutes. The fast recovery helps minimize cold-water delays during routines like rinsing vegetables, washing hands, or cleaning dishes.

• 95% thermal efficiency for reduced energy waste
• L-shaped heating element expands heating surface for speed
• Rapid recovery minimizes cold-water delays

Safe and durable design

The tank uses 304 stainless steel with seamless welding for a sturdy build. UL certification confirms compliance, and features such as corrosion resistance, high-pressure resilience, dry-burning prevention, and overheating protection support reliable daily use.

• 304 stainless steel tank with seamless welds
• UL certified for safety and reliability
• Corrosion and high-pressure resistance with protective safeguards

Easy installation and flexible placement

Comes with a pressure release valve and adapter hose, compatible with a 1/2 FIP interface. It can be wall-mounted or floor-mounted, making it suitable under kitchen sinks, in RVs, trailers, camping setups, offices, or bathrooms. Temperature is adjustable from 86 to 149 F.

• Pressure release valve and hose included
• 1/2 FIP interface for straightforward hookup
• Wall or floor mounting options for flexible placement
• Adjustable temperature 86–149 F

Smart insulation and energy efficiency

The unit features an insulated tank with a smart temperature control chip. When the set temperature is reached, the heater enters an efficient insulation mode. A fluorine-free polyurethane foam layer minimizes heat loss and extends insulation time.

• Smart temperature control reduces energy waste
• Fluorine-free polyurethane foam improves insulation
• Extended insulation time supports steady hot water supply

Capacity, compatibility, and performance

With a 4-gallon capacity, this compact heater provides a durable hot-water supply for on-demand tasks. It supports 110–120V AC, up to 108 psi, and recommends a 15 A circuit breaker, making it suitable for many small spaces.

• 4-gallon tank for steady hot water
• 110–120V AC; 108 psi max
• 15 A circuit breaker recommended

Real-world use and possibilities

Picture warm water for a morning face wash, a quick rinse for vegetables, or a fast dish pre-rinse. In an RV or compact kitchen, this unit may offer dependable hot water where larger heaters aren’t practical.

Note: This compact heater is designed for spaces where traditional options may not fit, offering practical, on-demand hot water without promising guaranteed results.