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.

Rtex 18 | Desertcart SINGAPORE

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Description

🔥 RTEX-18: Hot water on demand, smarter and sleeker than ever!

SPACE SAVING DESIGN - Compact, wall-mounted unit is 90% smaller than traditional tanks—perfect for modern minimalist homes.
SMART ENERGY EFFICIENCY - Advanced self-modulation technology adjusts power dynamically, saving up to 50% on heating bills.
DURABLE DUAL HEATING ELEMENTS - Copper immersion elements built for longevity and easy field servicing.
PRECISION TEMPERATURE CONTROL - External digital thermostat with LED display ensures exact hot water at your fingertips.
EFFORTLESS INSTALLATION MAINTENANCE - Threaded 3/4 inch NPT water connections simplify setup and replacement.

The Rheem RTEX-18 is a high-efficiency, tankless electric water heater delivering up to 4.4 gallons per minute with ±1 degree temperature accuracy via an external LED thermostat. Featuring durable copper immersion heating elements and advanced self-modulating technology, it optimizes energy use to save up to 50% on water heating costs. Its compact, wall-mounted design fits seamlessly into any space, making it ideal for single or whole-home applications without the bulk of traditional tanks.

Specifications

ASIN	B01MR7Z39V
Best Sellers Rank	#7,756 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Water Heaters
Brand Name	Rheem
Capacity	18 Gallons
Color	Gray
Customer Reviews	4.2 4.2 out of 5 stars (4,030)
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	14.5"W x 18.25"H
Item Type Name	Water Heater
Item Weight	14.78 Pounds
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
Special Features	LED Display
Style Name	Whole Home, 18 kw
UPC	020352685335
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	18000 watts

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RTEX-18

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