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: 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° LED digital thermostat

1036817CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Endless Hot Water, Zero Waste – Stay Ahead with Rheem! 💧

COMPACT SPACE SAVER - 90% smaller than traditional tanks, fits discreetly under sinks or tight spaces.
EFFORTLESS INSTALLATION - Threaded 3/4 inch NPT water connections make setup quick and hassle-free.
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 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 advanced self-modulating technology, a precise digital thermostat, and durable copper heating elements, it offers up to 4.4 gallons per minute flow rate and up to 50% energy savings. Ideal for single shower or mid-range whole-home use, this easy-to-install unit is a smart upgrade for modern, eco-conscious homes.

Specifications

ASIN	B01MR7Z39V
Best Sellers Rank	#6,840 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #5 in Water Heaters
Brand	Rheem
Brand Name	Rheem
Capacity	18 gallons
Color	Gray
Colour	Gray
Customer Reviews	4.2 out of 5 stars 2,061 Reviews
Efficiency	99.8%
Flow Rate	4.4 Gallons Per Minute
Global Trade Identification Number	00020352685335
Heat Output	18 Kilowatts
Included Components	Fittings, Aerators
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	6.7 kg
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
Power source	AC Power
Product dimensions	36.8W x 46.4H centimeters
Special Features	LED Display
Special features	LED Display
Style Name	Heater
UPC	020352685335
Unit Count	1 Count
Voltage	240 Volts
Wattage	18000 watts

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