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

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

Product ID: 54112092

Details

Brand
Rheem
Capacity
5.9 gallons
Power Source
Corded
Product Dimensions
17.63"W x
Special Feature
LED Display

⚡24kW high power output

💧5.9 GPM continuous flow

📏93% smaller footprint

$1351.07

Duties & taxes included

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Description

🔥 Hot water on demand, without the bulk! ⚡

SPACE SMART DESIGN - Compact size saves up to 93% space compared to traditional heaters—ideal for modern living.
POWERHOUSE PERFORMANCE - Delivers a robust 24kW output for uninterrupted hot water, perfect for whole-home use.
FUTURE READY INSTALLATION - Requires 3 x 40 AMP breakers and 200 AMP household service—built for today’s power demands.
ENERGY EFFICIENCY CHAMPION - 99.8% efficient, eliminating standby heat loss and cutting your energy bills.
PRECISION TEMPERATURE CONTROL - Adjust water temperature in 1-degree increments from 80°F to 140°F with an intuitive LED display.

The Rheem RTEX-24 is a 24kW, 240V electric tankless water heater delivering 5.9 gallons per minute of continuous hot water. Its compact, wall-mounted design is 93% smaller than traditional units, featuring precise digital temperature control and 99.8% energy efficiency. Designed for whole-home use, it requires a 200 AMP household service and triple 40 AMP breakers, backed by a limited lifetime warranty.

Specifications

ASIN	B01MS9DVEE
Best Sellers Rank	#9,228 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Water Heaters
Brand Name	Rheem
Capacity	5.9 gallons
Color	Gray
Customer Reviews	4.2 4.2 out of 5 stars (4,053)
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 Electric	Yes
Item Depth	3.5 inches
Item Dimensions W x H	17.63"W x 18.25"H
Item Type Name	Water Heater
Item Weight	17.8 Pounds
Manufacturer	Rheem
Manufacturer Part Number	RTEX-24
Manufacturer Warranty Description	Limited lifetime warranty
Material Type	Stainless Steel
Maximum Pressure	150 Pound per Square Inch
Maximum Temperature	140 Degrees Fahrenheit
Model Number	RTEX-24
Mount Type	Wall
Power Source	Corded Electric
Special Features	LED Display
Style Name	Whole Home, 24 kw
UPC	020352685397
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	24 KW

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