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 240V 2 Heating Chambers Residential Tankless Water Heater

Product ID: 724816964

Details

Capacity
18 Gallons
Colour
Silver
Power Source
Corded
Special Feature
Energy Space
Wattage
18000 Watts

⚡18 kW high power output

💧4.4 GPM max flow rate

📏90% smaller footprint

Description

🔥 Compact power, endless comfort — heat smarter, live better!

SPACE SAVVY DESIGN - Compact and sleek, fits discreetly under sinks or tight spaces.
ENERGY SMART SAVINGS - Self-modulating tech cuts your water heating bill by up to 50%.
POWERFUL EFFICIENT - 18 kW output delivers instant heat with high efficiency.
ENDLESS HOT WATER ON DEMAND - Never run out of hot water during your busiest mornings.
EASY WALL MOUNT INSTALLATION - Saves floor space and blends seamlessly into your home.

The Rheem RTEX-18 is a 240V electric tankless water heater delivering 18 kW of high-efficiency heat with a maximum flow rate of 4.4 gallons per minute. Its compact design is 90% smaller than traditional tanks, enabling flexible wall-mount installation and significant space savings. Featuring self-modulating technology, it reduces energy consumption by up to 50%, providing endless hot water on demand for single or multiple point-of-use applications.

Specifications

ASIN	B01MR7Z39V
Brand	Rheem
Brand Name	Rheem
Capacity	18 Gallons
Colour	Silver
Country of Publication	USA
Customer Reviews	4.2 out of 5 stars 2,099 Reviews
Flow Rate	4.4 Gallons Per Minute
Global Trade Identification Number	00020352685335
Heat Output	18 Kilowatts
Is Electric	Yes
Item Weight	14.78 Pounds
Manufacturer	Rheem
Manufacturer Part Number	RTEX-18
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-18
Mount Type	Wall
Power Source	Corded Electric
Special Feature	Energy Efficient , Space Saving
Special Features	Energy Efficient, Space Saving
Style Name	Indoor Installation
UPC	020352685335
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	18000 Watts

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