18kW Electric Tankless Water Heater, APUS 240V Instant On-Demand Hot Water Heater, Up to 4.4 GPM with LED Display, Energy-Saving Whole House Water Heating System, Space-Saving Design,Gray

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• 1. Up to 4.4 GPM for 2–3 Points Under Suitable Conditions: Enjoy continuous on-demand hot water without preheating or tank recovery. This 18kW electric tankless water heater delivers up to 4.4 GPM and can support 2–3 points of use, such as a shower, sink or laundry connection, when inlet-water temperature and flow demand are suitable.
• 2. 86–140°F Control with LED Display and Memory: Set the preferred outlet temperature from 86–140°F using the clear LED digital display, with adjustment in 1°F increments. The hot water heater built-in memory function restores the previous temperature setting after a power interruption, while intelligent self-modulation continuously adjusts heating output according to flow rate and inlet-water conditions for a more stable and comfortable supply.
• 3. Up to 99.8% Thermal Efficiency with Intelligent Self-Modulation: Achieving up to 99.8% thermal efficiency, the self-modulating heating system operates only when hot water is needed, eliminating standby heat loss associated with traditional storage tanks. By automatically matching power output to water flow and inlet temperature, electric water heater helps maintain stable performance while reducing unnecessary energy consumption. The anti-scale internal design helps preserve water flow and heating performance when the unit is installed and maintained according to the manual.
• 4. Compact Wall-Mounted Design with Mandatory 240V Hardwiring: The ultra-slim wall-mounted unit measures 17.72" × 11.42" × 3.54", helping save space in bathrooms, kitchens, laundry rooms, apartments and utility areas. It uses 3/4" NPT water connections and requires a dedicated 240V hardwired electrical supply, 3 × 40A double-pole breakers and 6 × 10 AWG copper conductors. Installation must be completed by a qualified electrician and plumber in accordance with local codes.
• 5. Multi-Layer Electrical and Temperature Protection: Designed with multiple protection functions, including leakage protection, over-temperature protection, surge protection and separated water-and-electricity pathways to support safer long-term operation. The digital system monitors operating conditions and helps shut down or limit heating when abnormal conditions are detected. This indoor unit requires proper grounding, adequate household service capacity and professional installation; it is not intended as a plug-in appliance.