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

Rheem 18kW 240V Tankless Electric Water Heater

Product ID: 273292299

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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

🌡️±1°C precision digital thermostat

Description

🔥 Endless hot water, zero wasted energy ⚡

COMPACT SPACE SAVER - 90% smaller than traditional tanks, fits discreetly under sinks or tight spaces
EFFORTLESS INSTALLATION - Threaded 3/4 inch NPT water connections for quick, hassle-free setup
ENERGY SMART SELF MODULATION - Automatically adjusts power to match your hot water demand, saving up to 50% on bills
PRECISION TEMPERATURE CONTROL - External LED display with ±1°C accuracy for perfect hot water every time
DURABLE COPPER HEATING ELEMENTS - Long-lasting, field-serviceable dual elements ensure reliable performance

The Rheem 18kW 240V Tankless Electric Water Heater delivers continuous hot water on demand with advanced self-modulating technology that optimizes energy use. Featuring a precise digital thermostat with LED display, durable copper heating elements, and a compact design 90% smaller than traditional tanks, it’s perfect for single shower or mid-range whole-home applications. Easy to install with threaded water connections, this energy-efficient unit saves space and cuts water heating costs by up to 50%.

Specifications

Brand	Rheem
Model	RTEX-18
Product Dimensions	46.99 x 36.83 x 8.89 cm; 6.7 kg
Energy Efficiency	99.8%
Water Consumption	7 gallons
Installation Type	Wall Mount
Part Number	RTEX-18
Special Features	LED Display
Colour	Copper
Voltage	240 Volts
Wattage	18000 watts
Material Type	Stainless Steel
Included Components	Fittings, Aerators
Batteries included?	No
Batteries Required?	No
Item Weight	6.7 kg

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