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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18kW 240V Tankless Electric Water Heater

Product ID: 273292299

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° precision digital thermostat

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Description

🔥 Hot water on demand, without the wait or waste! 💧

COMPACT SPACE SAVER - 90% smaller than traditional tanks—fits discreetly under sinks or tight spaces.
ENERGY SMART SELF MODULATION - Automatically adjusts power to match your hot water demand, saving up to 50% on energy bills.
PRECISION TEMPERATURE CONTROL - External LED display with ±1° accuracy keeps your hot water just right every time.
DURABLE COPPER HEATING ELEMENTS - Field-serviceable dual copper immersion elements ensure long-lasting, reliable performance.
EFFORTLESS INSTALLATION REPLACEMENT - Threaded 3/4 inch NPT water connections make setup and future upgrades a breeze.

The Rheem 18kW 240V Tankless Electric Water Heater delivers continuous, energy-efficient hot water with precise digital temperature control and advanced self-modulating technology. Its compact design saves space and installation time, while durable copper heating elements ensure long-term reliability. Ideal for single or multiple point-of-use applications, it offers up to 4.4 gallons per minute flow rate and can reduce your water heating energy consumption by up to 50%.

Specifications

ASIN	B01MR7Z39V
Best Sellers Rank	470,060 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,360 in Water Heaters & Parts
Brand	Rheem
Capacity	18 gallons
Colour	Copper
Country of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (2,034)
Efficiency	99.8%
Flow Rate	4.4 Gallons Per Minute
Global Trade Identification Number	00020352685335
Heat Output	18 Kilowatts
Included Components	Fittings, Aerators
Is Electric	Yes
Item Depth	14.5 inches
Item Dimensions W x H	36.8W x 46.4H centimetres
Item Type Name	Water Heater
Item Weight	14.78 Pounds
Manufacturer	Rheem
Material	Stainless Steel
Maximum Pressure	150
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-18
Mount Type	Wall
Part Number	RTEX-18
Power source	AC Power
Special Features	LED Display
Style	Whole Home, 18 kw
UPC	020352685335
Unit Count	1.0 count
Voltage	240 Volts
Wattage	18000 watts

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44913048₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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TrustScore 4.5 | 7,300+ reviews

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