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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Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray

Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray

Product ID: 724817007

Details

Brand
Rheem
Capacity
18 Gallons
Power Source
AC Power
Product Dimensions
36.8W x 46.4H
Special Feature
LED Display

⚡18kW high power output

🚿4.4 GPM flow rate for steady hot water

🌡️±1°F precise digital temp control

$1625.21

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Description

🔥 Instant Hot Water, Zero Wait — Upgrade Your Flow Game!

POWER THAT ADAPTS - Self-modulating technology adjusts energy use dynamically, saving you up to 50% on heating costs.
SPACE SMART DESIGN - Compact and wall-mountable, this unit is 90% smaller than traditional tanks—perfect for modern living spaces.
ENDLESS HOT WATER FLOW - Delivers up to 4.4 gallons per minute, ensuring no more cold showers or waiting around.
PRECISION AT YOUR FINGERTIPS - External LED display with ±1°F accuracy lets you dial in your perfect temperature every time.
EFFORTLESS INSTALLATION MAINTENANCE - Easy 3/4" NPT water connection and simple screw replacement make setup and upkeep a breeze.

The Rheem RTEX-18 is a high-efficiency 18kW electric tankless water heater designed for mid-range home use. Featuring precise digital temperature control with LED display, self-modulating power technology, and a compact wall-mount design, it delivers up to 4.4 GPM of endless hot water while saving up to 50% on energy costs. Ideal for single or multiple point applications, this durable unit offers easy installation and maintenance, making it a smart upgrade for modern households seeking space-saving and cost-effective hot water solutions.

Specifications

ASIN	B01MR7Z39V
Brand Name	Rheem
Capacity	18 Gallons
Color	gray
Customer Reviews	4.2 4.2 out of 5 stars (2,032)
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
Special Features	LED Display
Style Name	Whole Home 18kw
UPC	020352685335
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	18000 W

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$1625.21

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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