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.

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18kW 240V Tankless Electric Water Heater, Gray

Product ID: 322325986

Details

Brand
Rheem
Capacity
18 Gallons
Power source
AC Power
Product dimensions
36.8W x 46.4H
Special features
LED Display

⚡18kW high power output

🚿4.4 GPM flow rate

🌡️±1° precision digital thermostat

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Description

🔥 Endless Hot Water, Zero Waste – Upgrade Your Flow!

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 LED display with ±1° accuracy keeps your hot water just right every time.
DURABLE COPPER HEATING ELEMENTS - Field-serviceable dual copper immersions ensure long-lasting, reliable performance.
EFFORTLESS INSTALLATION REPLACEMENT - Threaded 3/4 inch NPT water connections make setup and upgrades a breeze.

The Rheem 18kW 240V Tankless Electric Water Heater delivers continuous hot water with precise digital control and energy-efficient self-modulation. Its compact design saves space while providing up to 4.4 gallons per minute flow, perfect for single or multi-point use. Durable copper heating elements and easy installation make it a smart, reliable upgrade for modern homes seeking comfort and savings.

Specifications

ASIN	B01MR7Z39V
ASIN	B01MR7Z39V
Best Sellers Rank	#46,422 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in Water Heaters
Brand Name	Rheem
Capacity	18 Gallons
Color	Gray
Customer Reviews	4.2 4.2 out of 5 stars (2,043)
Customer reviews	4.2 4.2 out of 5 stars (2,043)
Date First Available	2 March 2017
Efficiency	99.8%
Flow Rate	4.4 Gallons Per Minute
Global Trade Identification Number	00020352685335
Heat Output	18 Kilowatts
Included Components	Fittings, Aerators
Is Discontinued By Manufacturer	No
Is Electric	Yes
Item Depth	18.25 inches
Item Dimensions W x H	36.8W x 46.4H centimeters
Item Type Name	Water Heater
Item Weight	14.78 Pounds
Item model number	RTEX-18
Manufacturer	Rheem
Manufacturer	Rheem
Manufacturer Part Number	RTEX-18
Material Type	Stainless Steel
Maximum Pressure	150
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-18
Mount Type	Wall
Power Source	AC Power
Product Dimensions	46.99 x 36.83 x 8.89 cm; 6.7 kg
Special Features	LED Display
Style Name	Heater
UPC	020352685335
Unit Count	1 Count
Voltage	240 Volts
Wattage	18000 watts

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$1396.07

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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