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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Description

🔥 Elevate Your Hot Water Game!

DURABLE DESIGN - Built with copper immersion heating elements for long-lasting performance.
SLEEK AND COMPACT - Modern gray finish and compact size fit perfectly in any professional space.
EFFORTLESS INSTALLATION - Designed for simple wall mounting with 3/4 inch NPT connections.
SELF MODULATING TECHNOLOGY - Automatically adjusts power to meet your hot water demands seamlessly.
PRECISION TEMPERATURE CONTROL - Experience +/- 1 degree accuracy with the external digital thermostatic control.

The Rheem 18kW 240V Tankless Electric Water Heater is a high-efficiency solution designed for professionals seeking reliable hot water on demand. With a powerful 18,000 watts and a flow rate of up to 4.4 GPM, this unit features advanced self-modulation technology and a user-friendly LED display for precise temperature control. Its durable copper heating elements ensure longevity, while the easy installation process makes it a perfect fit for any modern workspace.

Specifications

Manufacturer	Rheem
Part number	RTEX-18
Item Weight	6.7 Kilograms
Product Dimensions	36.83 x 36.83 x 46.36 cm; 6.7 kg
Item model number	RTEX-18
Size	Small
Color	Gray
Style	Heater
Finish	Stainless Steel
Material	Stainless Steel
Shape	Rectangle
Power source type	AC Power
Voltage	240 Volts
Wattage	18000 watts
Installation Method	Wall Mount
Item Package Quantity	1
Flow Rate	4.4 Gallons Per Minute
Water Consumption	7 Gallons
Maximum Pressure	150
Plug Profile	Wall
Special Features	LED Display
Specific uses	Inside; Professional
Included components	Fittings, Aerators
Batteries Included?	No
Batteries Required?	No

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