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.

Rheem Rtex 18 18kw 240v Electric Tankless Water Kettle Small

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Description

🔥 Heat Smarter, Live Better — Never Run Out, Never Waste Energy!

SMART ENERGY SAVER - Self-modulating technology adjusts power dynamically, cutting water heating costs by up to 50%.
SPACE SMART DESIGN - Compact and sleek, this unit is 90% smaller than traditional tanks—perfect for modern minimalist homes.
ENDLESS HOT WATER FLOW - Delivers up to 4.4 gallons per minute, ideal for single or multiple mid-range household applications.
PRECISION AT YOUR FINGERTIPS - External digital LED display with ±1°F accuracy lets you customize comfort effortlessly.
EFFORTLESS INSTALLATION MAINTENANCE - 3/4" NPT bottom water connection and easy-to-replace heating elements make setup and upkeep a breeze.

The Rheem RTEX-18 is a powerful 18kW 240V electric tankless water heater designed for efficient, on-demand hot water delivery. Featuring precise digital temperature control with LED display, advanced self-modulating technology for energy savings, and a compact footprint that fits seamlessly into modern homes, it provides up to 4.4 GPM flow rate—perfect for single shower or mid-range household use. Easy to install and maintain, this unit offers endless hot water while reducing energy consumption by up to 50% compared to traditional tank heaters.

Specifications

ASIN	B01MR7Z39V
Brand	Rheem
Brand Name	Rheem
Capacity	18 Gallons
Color	gray
Customer Reviews	4.3 out of 5 stars 2,019 Your Review
Efficiency	99.8%
Flow Rate	4.4 Gallons Per Minute
Global Trade Identification Number	00020352685335
Heat Output	18 Kilowatts
Included Components	Fittings, Aerator
Is Electric	Yes
Item Depth	18.25 inches
Item Dimensions W x H	36.8W x 46.4H cm
Item Weight	6.7 kg
Manufacturer	Rheem
Manufacturer Part Number	RTEX-18
Material Type	Iron
Maximum Pressure	150 Pound per Square Inch
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-18
Mount Type	Wall
Power Source	AC Power
Product Dimensions	36.8W x 46.4H cm
Special Feature	LED Display
Special Features	LED Display
Style Name	Whole Home 18kw
UPC	020352685335
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	18000 W

Reviews

A**R

Awesome, works great!

1.04.2022

J**V

Buen producto

Bastante cumplidor aun para lo que yo esperaba ya que solo requiero una cantidad relativamente baja de agua caliente y da bastante mas de lo esperado, totalmente recomendable

8.12.2023

A**O

Buen producto

Es buen producto, solo la instalción se complica por el cableado electrico que debe ser calibre 8 y que los interruptores deben ser dobles por el tema de 220V. Por lo demas puedo comentar que el agua se calienta rapido, se mantiene a buena temperatura (ajustable),

19.03.2022

D**Y

Works well.

22.04.2026

E**E

Es lo de hoy, fuera gas, fuera depósitos

Excelente equipo

14.03.2024

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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