Can this directly replace a 40 gal tank heater with a 30A double pole breaker? What are power requrements?

No it can't. RTEX-24 requires 3 sets of wire and ground, and it needs 3x 40amp breaker. That's a total of 120amps

Why are 2 answers for the breaker requirements. Is it 3 double 40 or 3 double 60 amp

If the unit draws 40 amp. you need a 2 pole 40 amp breaker 2 #8 wires good for 40 amp and 1 # 10 wire for a bond. Now if the unit draws 60 amps you need 2 # 6's good for 65 amps. A 2 pole 60 amp breaker and 1 # 8 for a bond( ground wire).

Has anyone had a noticable difference in electric bill?

Yes, reduced electricity by about 20%. But this thing sucks. It has trouble keeping up with water flow and is noisy. Their support is atrocious. I would not recommend it. Select a different brand.

Can the unit operate as a rtex-18 if i only hook up 2 of the elements? because i only need the 18 specs as of now but would like the option to upgrade

Actually you can do this but you must be careful on which circuits are connected. Rheem says the elements are activated from right to left as power is required. The right most element connection also provides power to the control so this must always be connected. If the very left element is left disconnected, you will only get 2/3 of the rated power on a 3 element unit.

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RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Product ID: 328221018

Details

Brand
Rheem
Capacity
5.9 gallons
Power source
Corded
Product dimensions
44.8W x 46.4H
Special features
LED Display

⚡24kW powerful heating

💧5.9 GPM flow rate

📏Compact 90% smaller size

7600.44 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Hot water on demand, savings in hand! 💧

SPACE SAVING DESIGN - Sleek, wall-mounted unit 90% smaller than traditional tanks fits anywhere
ENDLESS HOT WATER FLOW - Delivers consistent 5.9 gallons per minute for whole-home comfort
MAINTENANCE FREE OPERATION - No venting required and durable stainless steel build for hassle-free use
ENERGY SMART SELF MODULATION - Automatically adjusts power usage, saving up to 50% on heating bills
PRECISION TEMPERATURE CONTROL - Adjustable digital display with ON/OFF dial for perfect hot water every time

The Rheem RTEX-24 is a 24kW electric tankless water heater delivering up to 5.9 GPM of continuous hot water. Its compact, wall-mounted design saves space and energy with self-modulating technology that cuts heating costs by up to 50%. Ideal for whole-home use, it features an adjustable digital temperature display and requires no venting, making it a sleek, efficient upgrade for modern living.

Specifications

ASIN	B01MS9DVEE
ASIN	B01MS9DVEE
Best Sellers Rank	#18,533 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #28 in Water Heaters
Brand Name	Rheem
Capacity	5.9 gallons
Color	Gray
Customer Reviews	4.3 4.3 out of 5 stars (862)
Customer reviews	4.3 4.3 out of 5 stars (862)
Date First Available	2 March 2017
Efficiency	99.8% Energy efficient
Flow Rate	5.9 Gallons Per Minute
Global Trade Identification Number	00020352685397
Heat Output	24 Kilowatts
Included Components	Fittings, Aerators
Is Discontinued By Manufacturer	No
Is Electric	Yes
Item Depth	3.5 inches
Item Dimensions W x H	44.8W x 46.4H centimeters
Item Type Name	Water Heater
Item Weight	17.8 Pounds
Item model number	RTEX-24
Manufacturer	Rheem
Manufacturer	Rheem
Manufacturer Part Number	RTEX-24
Material Type	Stainless Steel
Maximum Pressure	150 Pound per Square Inch
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-24
Mount Type	Wall
Number of Items	1
Number of Packs	1
Power Source	Corded Electric
Product Dimensions	46.36 x 36.83 x 8.89 cm; 8.07 kg
Special Features	LED Display
Style Name	Whole Home, 24 kw
UPC	020352685397
Unit Count	1 Count
Voltage	240 Volts
Wattage	24 KW

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