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.

Rtex 24 | Desertcart Belgium

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€ 1209.05

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Never run out of hot water again—power, precision, and space-saving style in one sleek unit!

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 service—built for homes that demand high performance.
ENERGY EFFICIENCY CHAMPION - 99.8% energy efficient, cutting costs and environmental impact with zero standby heat loss.
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 design is up to 93% smaller than traditional models, 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, making it a powerful, space-saving, and cost-effective upgrade for modern homes.

Specifications

ASIN	B01MS9DVEE
Best Sellers Rank	#10,996 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 (4,054)
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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€ 1209.05

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

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Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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RTEX-24

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