will this supply two showers, washer and dishwasher for two people? (1000 sf house)

Hello- Sizing an electric tankless is very difficult. I always recommend that you call Rheem at 800-432-8373 to get a suggestion. I want to say this will only keep up with ONLY 1 source of hot water at any one given time. That being said, the RTEX-18 performance ( @240V )- 1.5GPM - 82degree rise 2.0GPM - 62degree rise 2.5GPM - 49degree rise 3.0GPM - 41degree rise So.... what it can keep up with all depends on: -the temp of water coming into the house -the flow rate of each faucet/shower head/washing machine/source of hot water -outlet temp desired I hope this helped :) Ben

Paperwork says it requires four 40 amp breakers or two DP 40 amp breakers. Max draw of 75 amps.

Rheem rtex-18 be big enough to heat water in my shop to wash my hands and perhaps take a shower in kansas city, mo?

Yes you could even go with the unit rtex-15 one smaller if that's it. Good luck

how many breakers and what amp.

The RTEX-18 (240 Volt) requires (2) 40 amp breakers and 8 AWG wire.

Desertcart Logo

Deliver to Finland

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

🔥 Endless hot water, zero wasted energy ⚡

COMPACT SPACE SAVER - 90% smaller than traditional tanks, fits discreetly under sinks or tight spaces.
ENERGY SMART SELF MODULATION - Automatically adjusts power to match your hot water demand, saving up to 50% on energy bills.
PRECISION TEMPERATURE CONTROL - External digital thermostat with LED display ensures perfect hot water every time.
DURABLE COPPER HEATING ELEMENTS - Field-serviceable dual copper immersion elements for long-lasting, reliable performance.
EASY INSTALLATION REPLACEMENT - Threaded 3/4 inch NPT water connections simplify setup and maintenance.

The Rheem 18kW 240V Tankless Electric Water Heater delivers continuous hot water on demand with 99.8% efficiency. Featuring a precise LED digital thermostat, advanced self-modulating technology, and durable copper heating elements, it offers energy savings up to 50% and a compact design 90% smaller than traditional tanks. Ideal for single shower or mid-range whole-home use, this wall-mounted unit supports up to 4.4 gallons per minute flow rate and installs easily with standard 3/4 inch NPT connections.

Specifications

Brand	Rheem
Product Dimensions	14.5"W x 18.25"H
Special Feature	LED Display
Color	Gray
Wattage	18000 watts
Voltage	240 Volts
Maximum Flow Rate	4.4 Gallons Per Minute
Maximum Temperature	140 Degrees Fahrenheit
Heat Output	18 Kilowatts
Efficiency	99.8%
Style	Heater
Maximum Operating Pressure	150
Mounting Type	Wall
Manufacturer	Rheem
Item Depth	18.25 inches
UPC	020352685335
Global Trade Identification Number	00020352685335
Part Number	RTEX-18
Item Weight	14.78 pounds
Item model number	RTEX-18
Is Discontinued By Manufacturer	No
Size	Small
Finish	Stainless Steel
Shape	Rectangle
Installation Method	Wall Mount
Item Package Quantity	1
Water Consumption	7 Gallons
Special Features	LED Display
Usage	Inside; Professional
Included Components	Fittings, Aerators
Batteries Included?	No
Batteries Required?	No