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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🔥 Instant Hot Water, Zero Wait – Power Your Day with Precision! ⚡

SMART POWER MODULATION - Advanced self-modulation technology dynamically adjusts power to match your exact hot water demand, maximizing efficiency.
EFFORTLESS INSTALLATION - Threaded 3/4 inch NPT water connections and wall-mount design make setup quick and hassle-free.
ENERGY EFFICIENCY CHAMPION - Boasts an impressive 99.8% energy efficiency rating, saving you money while reducing your carbon footprint.
PRECISION TEMPERATURE CONTROL - External LED display with ±1°C accuracy lets you tailor your perfect hot water experience effortlessly.
DURABLE COPPER HEATING ELEMENTS - Dual copper immersion heaters ensure long-lasting performance and easy field servicing for minimal downtime.

The Rheem RTEX-18 is a sleek, wall-mounted 18kW tankless electric water heater featuring a digital thermostatic control with ±1°C accuracy, dual copper heating elements, and a flow rate up to 4.4 GPM. Designed for easy installation and exceptional energy efficiency (99.8%), it delivers on-demand hot water with smart power modulation to optimize performance and reduce energy waste.

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Brand	Rheem
Model	RTEX-18
Product Dimensions	36.83 x 36.83 x 46.36 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

Rheem18kW 240V Tankless Electric Water Heater

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