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

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 flow rate

📏93% smaller footprint

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Description

🔥 Power up your home with endless hot water, minus the bulk!

SPACE SAVVY DESIGN - Compact size saves up to 93% space compared to traditional heaters—perfect for modern homes.
INSTANT HOT WATER ZERO WAIT - On-demand heating delivers continuous, consistent hot water exactly when you need it.
BUILT TO LAST WITH CONFIDENCE - Durable stainless steel construction backed by a limited lifetime warranty ensures long-term reliability.
ENERGY EFFICIENCY AT ITS BEST - 99.8% energy efficient with self-modulating power control to cut waste and lower bills.
PRECISION TEMPERATURE CONTROL - Adjustable digital display and ON/OFF dial let you dial in your perfect water temp effortlessly.

The Rheem RTEX-24 is a 24kW, 240V electric tankless water heater delivering up to 5.9 gallons per minute of continuous hot water. Its compact design is 93% smaller than traditional models, saving space while offering 99.8% energy efficiency through self-modulating power control. Featuring an adjustable digital temperature display and durable stainless steel build, it’s engineered for reliable, on-demand performance with a limited lifetime warranty.

Specifications

ASIN	B01MS9DVEE
Best Sellers Rank	#8,813 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	4.3 4.3 out of 5 stars (898)
Efficiency	99.8% Energy efficient
Flow Rate	5.9 gpm
Global Trade Identification Number	00020352685397
Heat Output	24 KW
Included Components	Fittings, Aerators
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 psi
Maximum Temperature	140 °F
Model Number	RTEX-24
Mount Type	Wall
Number of Items	1
Power Source	Corded Electric
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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TrustScore 4.5 | 7,300+ reviews

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960786CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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The product quality is outstanding. Exactly what I needed for my work.

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