Rheem 18kW 240V Tankless Electric Water Heater – Gray | On-Demand, Compact, No-Venting

Overview

Meet the Rheem 18kW 240V Tankless Electric Water Heater in Gray, designed for mid-range whole-home setups or single-shower use in the Midwest. This compact unit delivers hot water on demand without the bulk of a traditional tank, freeing up wall space and simplifying installation.

Compact, on-demand performance

With a footprint about 90 percent smaller than a tank, it can be tucked away under a sink or inside a utility cabinet. The unit heats water only when you turn on a tap, helping you avoid standby energy loss and giving you more control over your hot water needs.

• External digital thermostatic control with LED display for precise temperature adjustments (+/1 degree).
• Most advanced self-modulation that adjusts power to meet hot water demand.
• Copper immersion two heating elements for durable heat transfer; field serviceable.
• Flow rate up to 4.4 GPM, suitable for solo showers or small multi-use setups.
• Bottom 3/4 inch NPT water connections for simple installation.
• Threaded design allows easy replacement and maintenance; digital temperature display for quick checks.

Practical benefits for your home

This model supports continuous hot water on demand, without venting requirements, which can simplify install locations and keep a clean, modern look. It is an energy-conscious choice for those aiming to reduce space and energy use without compromising comfort.

• No venting required, enabling flexible placement in compact spaces.
• No bulky tank means a smaller footprint and easier upgrading of closets or under-sink areas.
• Self-modulation can help manage energy use by responding to actual hot water demand.

Whether upgrading from a traditional tank or selecting a space-saving heater for a specific bathroom, this Rheem unit offers on-demand hot water with reliable performance and simple maintenance.