Rheem RTEX-13 Residential Tankless Water Heater: External adjustable digital thermostatic control
- 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
- First listed by seller: 8/5/25
If you are interested in more details, you can find full information on the seller's page.
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Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Rheem RTEX-13 External adjustable digital thermostatic control
|
Rheem RTEX-24
|
Rheem RTG-95DVLN-3 Gray Continuous hot water for entire house
|
Rinnai V53DeP Endless hot water flow
|
Rheem RTEX-18 Gray
|
Rinnai RX199iN Silver
|
|
| Brand | Rheem | Rheem | Rheem | Rinnai | Rheem | Rinnai |
| Model | RTEX-13 | RTEX-24 | RTG-95DVLN-3 | V53DeP | RTEX-18 | RX199iN |
| Color |
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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
Ava H.
New York, NY
August 13, 2025
As an engineer wirh a perfectionist streak, I approached buying this Rheem wtaer heater with caution, but it's turned out to be a fantastic choice. I live in a cozy New York apartment with my adult child, and we've been using it for a couple of months now. The story starts with me wanting to save space and energy—our old tank was a clunker! This thing heats water on demand, so no more waiting or running out mid-shower. I love that I can tweak the temperature to the exact degree using the digital display; it's so precise, which is a big deal for someone like me who values control. The build feels durable, and I appreciate that parts are easy to service if needed. Energy efficiency is a huge plus; it adjusts based on usage, and I've seen my bills drop, which is a relief on a middle income. However, it's not perfect—when we both use hot water at the same time, the flow can dip a bit, but for our small family, it's mostly fine. Overall, it's been a reliable upgrade that meets my high standards. :)
- Pros: I'm extremely impressed with how this Rheem unit provides a steady supply of hot water without taking up much room—it's perfect for my small apartment. The temperature control is precise, allowing me to set it exactly how I like, and it adjusys power usage smartly based on demand, which has noticeably cut down my energy bills. Installation was straightforward with the included connectors, making it a hassle-free upgrade.