Rheem RTEX-13 Residential Tankless Water Heater: External adjustable digital thermostatic control
Let me tell you about the Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater—because who doesn’t love a gadget that promises endless hot water without hogging your closet space? This little powerhouse delivers hot water on tap, whether you’re washing dishes or pretending your shower is a tropical waterfall. And with its external adjustable digital thermostatic control (complete with a snazzy LED display), you can tweak the temperature down to the exact degree. No more guessing games with the faucet.
Inside, it’s packing durable copper immersion heating elements that are not just tough but also field serviceable—because things happen, and Rheem gets it. The self-modulating power control is like having a smart assistant that adjusts energy use based on how much hot water you’re actually using. Translation: efficiency that doesn’t make you feel guilty. Plus, with 1/2 NPT adapters and side compression water connections included, installation is less of a headache and more of a 'why didn’t I do this sooner?' moment. If you’re into saving space, cutting energy bills, and never running out of hot water, this tankless heater is basically your home’s new best friend.
- Durable Copper immersion heating elements
- Simple installation with included adapters
- 99.8% energy efficient
- Self-modulating power control
- External adjustable digital thermostatic control
General specs
- Brand: Rheem
- Model: RTEX-13
- Seller: Amazon
- product_dimensions: 1"W x 1"H
- special_feature: LED Display
- color: Gray
- wattage: 13 KW
- voltage: 240 Volts
- maximum_flow_rate: 4.8 Gallons Per Minute
- maximum_temperature: 1.4E+2 Degrees Fahrenheit
- heat_output: 13 Kilowatts
- efficiency: at least 99.8% energy efficient
- style: Heater
- mounting_type: Wall
- is_electric: Yes
- item_depth: 0.5 inches
- thickness: 1 Inches
- item_weight: 3.96 pounds
- included_components: Rheem RTEX-13 Residential Tankless Water Heater
If you are interested in more details, you can find full information on the seller's page.
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$274.50
Last price update: 8/5/25
Available to order
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Delivery to 
United States
United States
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Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Rheem RTEX-13 External adjustable digital thermostatic control
|
Rheem RTEX-24
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Rheem RTG-95DVLN-3 Gray Continuous hot water for entire house
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Rinnai V53DeP Endless hot water flow
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Rheem RTEX-18 Gray
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Rinnai RX199iN Silver
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| Brand | Rheem | Rheem | Rheem | Rinnai | Rheem | Rinnai |
| Model | RTEX-13 | RTEX-24 | RTG-95DVLN-3 | V53DeP | RTEX-18 | RX199iN |
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| Rating |
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| Price | $274.50 | $498.99 | $993.86 | $669.50 | $437.94 | $1,512.42 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | August 5, 2025 | June 27, 2025 | June 27, 2025 | June 27, 2025 | August 5, 2025 | July 19, 2025 |
| product_dimensions | 1"W x 1"H | 17.63"W x 18.25"H | 13"W x 30"H | |||
| maximum_flow_rate | 4.8 Gallons Per Minute | 5.9 Gallons Per Minute | 5.3 Gallons Per Minute | |||
| heat_output | 13 Kilowatts | 24 Kilowatts | 81 Kilowatts | |||
| efficiency | at least 99.8% energy efficient | 99.8% Energy efficient | High | |||
| mounting_type | Wall | Wall | Wall | |||
| is_electric | Yes | Yes | No | |||
| item_depth | 0.5 inches | 3.5 inches | 7.9 in / (202 mm) | |||
| item_weight | 3.96 pounds | 17.8 pounds | 33 pounds | |||
| included_components | Rheem RTEX-13 Residential Tankless Water Heater | Fittings, Aerators | Water Heater | |||
| Maximum Flow Rate | 9.5 Gallons Per Minute | 4.4 Gallons Per Minute | 11 Gallons Per Minute | |||
| Maximum Temperature | 140 Degrees Fahrenheit | 140 Degrees Fahrenheit | 140 Degrees Fahrenheit | |||
| Efficiency | 0.82 | 99.8% | High (UEF .98) | |||
| Mounting Type | Wall | Wall | Wall | |||
| Item Weight | 46.5 pounds | 14.78 pounds | 55 pounds | |||
Residential Tankless Water Heater
$274.50
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