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 18kW 240V Tankless Electric Water Heater, Gray

Product ID: 38866492

Details

Brand
Rheem
Capacity
18 gallons
Power Source
AC Power
Product Dimensions
14.5"W x
Special Feature
LED Display

⚡18kW high power output

💧4.4 GPM flow rate

🔆±1° LED digital thermostat

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Description

🔥 Endless hot water, zero waste — power your lifestyle with precision ⚡

COMPACT SPACE SAVER - 90% smaller than traditional tanks, fits discreetly under sinks or tight spaces—style meets function.
EFFORTLESS INSTALLATION - Threaded 3/4 inch NPT water connections simplify setup and replacement—get hot water fast.
ENERGY SMART SELF MODULATION - Advanced self-modulating tech adjusts power dynamically, slashing energy use by up to 50%.
PRECISION TEMPERATURE CONTROL - External digital thermostat with LED display ensures exact hot water temp within ±1° for ultimate comfort.
DURABLE COPPER HEATING ELEMENTS - Field-serviceable dual copper immersion elements guarantee long-lasting, reliable performance.

The Rheem 18kW 240V Tankless Electric Water Heater delivers continuous hot water on demand with a sleek, compact design that saves space and energy. Featuring a precise LED digital thermostat, advanced self-modulating technology, and durable copper heating elements, it offers up to 4.4 GPM flow rate and can reduce water heating bills by up to 50%. Ideal for single or whole-home applications, this wall-mounted unit is easy to install and built for lasting performance.

Specifications

ASIN	B01MR7Z39V
Best Sellers Rank	#7,721 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Water Heaters
Brand Name	Rheem
Capacity	18 gallons
Color	Gray
Customer Reviews	4.2 4.2 out of 5 stars (2,177)
Efficiency	99.8%
Flow Rate	4.4 gpm
Global Trade Identification Number	00020352685335
Heat Output	18 KW
Included Components	Fittings, Aerators
Item Depth	18.25 inches
Item Dimensions W x H	14.5"W x 18.25"H
Item Type Name	Water Heater
Item Weight	14.8 pounds
Manufacturer	Rheem
Manufacturer Part Number	RTEX-18
Material Type	Stainless Steel
Maximum Pressure	150
Maximum Temperature	140 °F
Model Number	RTEX-18
Mount Type	Wall
Number of Items	1
Power Source	AC Power
Special Features	LED Display
Style Name	Whole Home, 18 kw
UPC	020352685335
Unit Count	1 Count
Voltage	240 volts
Wattage	18000 watts

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799770CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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