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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🔥 Hot water, zero wait — upgrade your flow game!

ENERGY SMART SAVINGS - Self-modulating tech cuts your water heating bill by up to 50%.
POWERFUL PERFORMANCE - 18kW heating capacity delivers consistent warmth for single or multiple points.
ULTRA COMPACT DESIGN - Save precious space with a unit 90% smaller than traditional tanks.
EFFORTLESS INSTALLATION - Wall-mounted and vent-free for flexible placement anywhere in your home.
ENDLESS HOT WATER ON DEMAND - Never run out of hot water during your busiest mornings.

The Rheem RTEX-18 is a sleek, energy-efficient 18kW tankless electric water heater delivering up to 4.4 gallons per minute. Its compact, wall-mounted design saves 90% space compared to traditional tanks, while self-modulating technology reduces energy consumption by up to 50%, providing endless hot water on demand without venting.

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Special Feature	Energy Efficient, Space Saving
Colour	Silver
Wattage	18000 Watts
Voltage	240 Volts
Maximum Flow Rate	4.4 Gallons Per Minute
Heat Output	18 Kilowatts
Efficiency	High Efficiency
Mounting Type	Wall
Is Electric	Yes
Manufacturer	Rheem
UPC	020352685335
Global Trade Identification Number	00020352685335
Item model number	RTEX-18
Product Dimensions	36.83 x 36.83 x 46.36 cm; 6.7 kg
ASIN	B01MR7Z39V

Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater

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