6 Best Alternatives to the Rheem RETEX-36 Performance 36 kw (2026)
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The Rheem RETEX-36 Performance 36 kw delivers 6 GPM of hot water in a compact 18.3-inch frame. If you are searching for rheem retex 36 performance 36 kw alternatives, you likely need different dimensions or features. This unit suits small spaces but may not fit homes requiring higher flow or smart controls.
Our list of 6 options shares the same 36 kW power rating. We selected these models because their core specs overlap with the original unit. You might prefer a wider unit for easier access or a slimmer design for tight closets. Some alternatives offer WiFi management or higher flow rates. Others prioritize durable copper internals or simple external temperature knobs. Each choice meets the 36 kW standard while varying in size, weight, or connectivity. You can compare these specifications to find the best fit for your electrical setup and spatial constraints.
Our top pick: Rheem 36 kW 6 GPM Electric Tankless Water Heater.
How these models differ from the Rheem
Stiebel Eltron Tempra 36 Trend Tankless Water Heater
The Stiebel Eltron Tempra 36 Trend matches the Rheem’s 36 kW output but uses copper internals for durability. It is narrower at 16.6 inches wide and thinner at 4.63 inches deep. This design helps it fit into tighter electrical panels or smaller wall spaces. You get a robust build for heavy-duty setups. However, it lacks WiFi connectivity. If you prioritize long-term reliability and compact depth over smart controls, this model is a strong alternative to the standard Rheem unit.
WINTEMP 36kW Electric Tankless Water Heater
The WINTEMP WN36 offers WiFi control, which the Rheem RETEX-36 does not. It shares the 36 kW wattage but weighs more at 36.1 pounds. Its dimensions are 13.7 inches wide and 21.1 inches high. This unit suits users who want remote monitoring and safety certifications. You gain smart features but accept a heavier footprint. If you need app management for your hot water system, this WINTEMP model provides that connectivity while maintaining the same power level as your current choice.
WINTEMP 36 kW WiFi Tankless Water Heater
The WINTEMP WM36V also includes WiFi features, unlike the base Rheem model. It weighs 38 pounds and measures 13.7 inches wide by 19.4 inches high. Like the other WINTEMP, it offers 36 kW of power. This unit is ideal for homes with robust electrical systems that require high flow and app control. You trade the Rheem’s simplicity for digital management capabilities. If you can handle complex wiring and want smart oversight, this model delivers the same heating power with added connectivity.
VEVOR 36kW Touchscreen Electric Tankless Water Heater
The VEVOR JN36 features a direct touchscreen interface, providing immediate local control without needing a smartphone app. It is 13.7 inches wide and only 5.31 inches deep, making it thinner than the Rheem. It weighs 34 pounds and delivers 36 kW. This unit is suited for high-demand residential showers or light commercial use. You get durable aluminum heating elements and straightforward operation. If you prefer physical touch controls over digital apps, this VEVOR heater offers a compact, durable alternative with similar power output.
Atmor 36kW 7.03 GPM Tankless Water Heater
The Atmor AT-36N-XTP provides a higher flow rate of 7.03 GPM compared to the Rheem’s 6 GPM. It is very thin at 4.49 inches deep and weighs 18.2 pounds. This model offers precise digital control for larger households. You gain significant water volume for whole-home usage. The trade-off is a different form factor with a longer length at 23.2 inches. If you need more simultaneous hot water capacity and precise digital adjustment, this Atmor unit is a powerful alternative to the standard Rheem performance.
Rheem 36 kW Electric Tankless Water Heater
The Rheem RTEX-36 model shares the same 36 kW power but weighs 24.4 pounds. It is designed for users who value external temperature adjustment. This unit offers straightforward performance without smart features. It is a no-frills electric solution for reliable heating. You get a familiar brand and simple operation. If you do not need WiFi or complex digital controls, this version provides a clean, external adjustment interface. It is a practical choice for those seeking a dependable, simple electric water heater with external temperature management.
Quick picks
Our 7 picks
Rheem 36 kW 6 GPM Electric Tankless Water Heater
Best for: compact electric homes needing 6 GPM
- Fuel Type
- Electric
- Flow Rate
- 6 GPM
- Wattage
- 36 kW
- Dimensions
- 18.3 x 21.6 x 21.6 inches
- Weight
- 19 pounds
View on Amazon: Rheem 36 kW 6 GPM Electric Tankless Water Heater
The Rheem RETEX-36 delivers 36 kW of power to provide up to 6 GPM of hot water. It measures 18.3 x 21.6 x 21.6 inches and weighs 19 pounds. This electric unit is self-modulating to adjust output based on demand. You get a compact, gray unit that fits in tight spaces. It is a practical option for those who need reliable electric heating without complex installation requirements.
Pros
- 36 kW heating capacity
- 6 GPM flow rate
- Self-modulating technology
- Compact 19-pound build
Cons
- Refurbished condition
- No WiFi connectivity
- No remote control
Good fit if
- You need a compact electric heater
- You want a 6 GPM flow rate
- You prefer self-modulating efficiency
Skip if
- You require WiFi control
- You want a brand-new unit
- You need a remote display
Verdict: Rheem 36kW Electric Tankless 6 GPM offers solid 36 kW performance for households needing 6 GPM. It suits buyers who prioritize compact size and self-modulating efficiency over modern smart features.
Stiebel Eltron Tempra 36 Trend Tankless Water Heater
Best for: Heavy-duty electrical setups and durability seekers
- Fuel Type
- Electric
- Wattage
- 36 kW
- Voltage
- 240 V
- Temperature Control
- 68° to 140°F
- Dimensions
- 14.5 x 16.6 x 4.63 in
- Use
- Whole House
View on Amazon: Stiebel Eltron Tempra 36 Trend Tankless Water Heater
The Stiebel Eltron Tempra 36 Trend is a 36 kW electric tankless water heater designed for 240V circuits. It delivers an output temperature range of 68°F to 140°F with a compact footprint of 14.5 by 16.6 inches. This unit features a solid copper heating system and auto-modulation for energy efficiency. It suits you if you need a reliable, space-saving solution with a 7-year leakage warranty.
Pros
- 36 kW power output for continuous hot water
- Compact dimensions of 14.5 x 16.6 x 4.63 inches
- Solid copper heating system for durability
- 7-year leakage and 3-year parts warranty
Cons
- Requires a minimum 300 A electric service
- No built-in WiFi or remote control
- Heavier at 19 pounds compared to some plastic models
Good fit if
- You have a 300 A electrical panel available
- You prefer a solid copper heating element
- You want a 7-year leakage warranty
Skip if
- You only have a 200 A electrical service
- You need WiFi connectivity for remote control
- You require a lighter unit under 15 pounds
Verdict: Stiebel Eltron Tempra 36 Trend 36kW is a robust choice for homes with heavy electrical capacity. It offers durability through its copper internals and strong warranty coverage, making it ideal for users prioritizing long-term reliability over smart features.
WINTEMP 36kW Electric Tankless Water Heater
Best for: WiFi control and high flow needs
- Fuel Type
- Electric
- Flow Rate
- 8.7 GPM
- Wattage
- 36 kW
- Voltage
- 240 V
- Certification
- ETL
- Dimensions
- 21.5" H × 13.7" W × 5.2" D
The WINTEMP 36kW unit delivers up to 8.7 GPM of hot water at 240V. Its self-modulating technology adjusts power output based on flow and inlet temperature to maintain stability. You get WiFi control via smartphone and ETL certification for safety. The compact 13.7 x 21.5 inch design saves space. This model suits homes with 3–5 bathrooms in mild climates seeking reliable, energy-efficient on-demand heating.
Pros
- High flow rate of 8.7 GPM
- Built-in WiFi for remote control
- ETL certified for safety
- Self-modulating energy efficiency
Cons
- Requires four 40A double-pole breakers
- Draws 150A maximum current
- 2-year warranty is shorter than industry average
Good fit if
- You need WiFi temperature control
- You have a 300A electrical service
- You want ETL certification
Skip if
- You lack four 40A circuit breakers
- You have a mild electrical panel
- You want a longer warranty
Verdict: WINTEMP 36kW Electric WiFi Heater offers high flow and smart control for homes with robust electrical capacity. It fits users who prioritize WiFi management and safety certification over extended warranty coverage.
WINTEMP 36 kW WiFi Tankless Water Heater
Best for: high-flow homes with strong electrical setups
- Fuel Type
- Electric
- Flow Rate
- 8.7 GPM
- Wattage
- 36 kW
- Voltage
- 240V
- Temperature Control
- 86°F to 140°F
- Certification
- ETL
The WINTEMP WM36V is a 36kW electric tankless water heater rated at 240V. It delivers up to 8.7 GPM of hot water. The unit features WiFi control via the Tuya Smart app for remote temperature adjustments between 86°F and 140°F. Its compact design measures 19.4 inches high and weighs 38 pounds. This model suits households needing high flow rates with smart connectivity.
Pros
- High flow rate of 8.7 GPM
- WiFi app control for remote monitoring
- ETL certified for safety
- Self-modulating technology saves energy
Cons
- Requires four 40-amp double-pole breakers
- Needs 4 sets of 8 AWG wiring
- Higher electrical infrastructure demands than standard units
Good fit if
- You have the electrical capacity for 150A total load
- You want remote temperature control via an app
- You need high flow for multiple fixtures
Skip if
- You cannot install four separate 40-amp circuits
- You lack space for 8 AWG wiring runs
- You prefer simple manual controls without WiFi
Verdict: The WINTEMP WM36V 36kW Electric Tankless is ideal for homes with robust electrical systems that need high flow and app control. It fits users who can handle complex wiring for superior performance.
VEVOR 36kW Touchscreen Electric Tankless Water Heater
Best for: High-demand residential showers and light commercial use
- Fuel Type
- Electric
- Wattage
- 36KW
- Voltage
- 240V
- Temperature Control
- 30-60°C / 86-140°F
- Dimensions
- 13.7 x 13.7 x 5.31 inches
- Weight
- 34 pounds
View on Amazon: VEVOR 36kW Touchscreen Electric Tankless Water Heater
This VEVOR unit delivers 36 kW of power at 240V, heating water to 86-140°F within seconds. It features a die-cast aluminum heating element that separates water and electricity to reduce scale buildup. The black unit includes an LCD touch screen for real-time temperature monitoring and a security lock. It measures 13.7 x 13.7 x 5.31 inches and weighs 34 pounds. It suits homes needing instant hot water for showers or commercial tasks.
Pros
- 36 kW heating power for rapid hot water delivery
- LCD touch screen for real-time temperature monitoring
- Die-cast aluminum heating element reduces scale buildup
- Security lock prevents accidental changes
Cons
- Requires 4x40A circuit breakers and 8AWG wire
- No WiFi or smart home connectivity listed
- Lacks a remote control option
Good fit if
- You need a high-output electric heater for multiple fixtures
- You prefer physical touch controls over smartphone apps
- You want scale-resistant die-cast aluminum heating elements
Skip if
- You require WiFi connectivity for remote control
- You cannot install 4x40A circuit breakers
- You prefer a smaller unit under 13 inches wide
Verdict: VEVOR 36kW Electric Tankless Water Heater provides reliable instant heat for high-demand households. It fits users who value durable aluminum heating elements and direct touch screen control without needing smart features.
Atmor 36kW 7.03 GPM Tankless Water Heater
Best for: Whole-home hot water with precise digital control
- Fuel Type
- Electric
- Flow Rate
- 7.03 GPM
- Wattage
- 36kW
- Temperature Control
- 90°F–125°F, 1°F increments
- Certification
- cETL
- Dimensions
- 23.2 x 4.49 x 14.3 inches
The Atmor PRO XTP delivers 7.03 GPM of hot water for whole-home use. It features self-modulating technology to save energy and a digital display for precise temperature control in 1°F increments. The unit requires four 40-amp breakers and 8/2 AWG wires. Its compact design fits wall-mounted installations, making it a solid option for homes needing reliable, instant hot water.
Pros
- 7.03 GPM flow rate supports multiple showers
- Digital controls allow 1°F temperature increments
- Self-modulating technology eliminates standby loss
- cETL certified for safety and compliance
Cons
- Requires four 40-amp double pole breakers
- Uses 8/2 AWG wiring for installation
- 2-year limited parts warranty is shorter than some competitors
Good fit if
- You need high flow for 4-5 bathrooms in warm climates
- You want precise temperature adjustments in 1°F steps
- You have the electrical capacity for four 40-amp breakers
Skip if
- You cannot install four 40-amp double pole breakers
- You require wiring thicker than 8/2 AWG
- You prefer a longer than 2-year parts warranty
Verdict: Atmor PRO XTP 36kW Electric Heater provides strong 7.03 GPM output and precise digital control, making it ideal for larger households with the necessary electrical setup.
Rheem 36 kW Electric Tankless Water Heater
Best for: Simple external temperature control needs
- Fuel Type
- Electric
- Wattage
- 36kW
- Voltage
- 240V
- Temperature Control
- Ext Adj Temp Ctrl
- Dimensions
- Bot 3/4 in. Npt Con
- Weight
- 24.4 pounds
The Rheem RTEX-36 delivers 36 kW of heating power at 240V. It provides on-demand hot water for your home. The unit features external adjustable temperature control. This allows you to set the exact output temperature. It weighs 24.4 pounds. The silver finish fits most utility spaces. It suits households needing reliable electric heating without complex digital interfaces.
Pros
- 36 kW heating capacity
- 240V electric operation
- External adjustable temperature control
- Compact 24.4-pound design
Cons
- Lacks WiFi connectivity
- No digital display shown
- Basic external dial controls
Good fit if
- You want simple mechanical controls
- You need a 36 kW electric unit
- You prefer external temperature adjustment
Skip if
- You require WiFi smart features
- You need a digital display
- You want remote app control
Verdict: Rheem RTEX-36 36kW Electric Heater offers straightforward performance for users who value external temperature adjustment over smart features. It is ideal for those seeking a reliable, no-frills electric solution.
Specifications side by side
| Spec | Rheem 36 kW 6 GPM Electric Tankless Water Heater | Stiebel Eltron Tempra 36 Trend Tankless Water Heater | WINTEMP 36kW Electric Tankless Water Heater | WINTEMP 36 kW WiFi Tankless Water Heater | VEVOR 36kW Touchscreen Electric Tankless Water Heater | Atmor 36kW 7.03 GPM Tankless Water Heater | Rheem 36 kW Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | 6 GPM | not specified | 8.7 GPM | 8.7 GPM | not specified | 7.03 GPM | not specified |
| Wattage | 36 kW | 36 kW | 36 kW | 36 kW | 36KW | 36kW | 36kW |
| Voltage | not specified | 240 V | 240 V | 240V | 240V | not specified | 240V |
| Temperature Control | not specified | 68° to 140°F | not specified | 86°F to 140°F | 30-60°C / 86-140°F | 90°F–125°F, 1°F increments | Ext Adj Temp Ctrl |
| Certification | not specified | not specified | ETL | ETL | not specified | cETL | not specified |
| Dimensions | 18.3 x 21.6 x 21.6 inches | 14.5 x 16.6 x 4.63 in | 21.5" H × 13.7" W × 5.2" D | 19.4" x 13.7" x 4.6" | 13.7 x 13.7 x 5.31 inches | 23.2 x 4.49 x 14.3 inches | Bot 3/4 in. Npt Con |
| Use | not specified | Whole House | Whole House | Whole House | not specified | not specified | not specified |
| Features | not specified | not specified | WiFi | WiFi | not specified | not specified | not specified |
| Weight | 19 pounds | 19 pounds | 36.1 pounds | 38 pounds | 34 pounds | 18.2 pounds | 24.4 pounds |
| Color | Gray | White | Gray | Gray | Black | Gray | Silver |
| Model | RTEX-36 | 36 Trend | WN36 | WM36V | JN36 | AT-36N-XTP | RTEX-36 |
| Size | not specified | 36 (kW) | 36kW | not specified | 36KW | 7.03 GPM | not specified |
If you are considering another 36 kW model, review cooper hunter 36 alternatives to compare similar heating capacities.
Frequently asked questions
Which 36 kW tankless heater is the most compact?
The Stiebel Eltron Tempra 36 Trend is the narrowest option at 16.6 inches wide and just 4.63 inches deep. Its white casing fits well in tight utility spaces. At 19 pounds, it is lightweight and easy to mount on a wall.
Do any 36 kW models offer WiFi control?
Yes, the WINTEMP WN36 and WM36V models both include WiFi capabilities. These units allow you to manage settings remotely via an app. They are designed for homes with robust electrical setups that can handle the high flow and smart connectivity features.
Which unit provides the highest flow rate?
The Atmor AT-36N-XTP delivers 7.03 GPM, which is higher than the standard 6 GPM output of most other 36 kW models. This increased flow makes it suitable for larger households. It features precise digital control for consistent temperature management.
Is there a model with a touchscreen interface?
The VEVOR JN36 features a direct touchscreen control panel. It uses durable aluminum heating elements for reliable instant heat. This model is ideal for users who prefer direct physical interaction over smartphone apps or external temperature knobs.
Which heater is best for heavy-duty electrical setups?
The Stiebel Eltron Tempra 36 Trend is built for durability with copper internals. It is designed to handle heavy-duty electrical demands. This makes it a strong choice for users prioritizing long-term reliability and robust construction in their water heating system.
What is the lightest 36 kW tankless water heater?
The Atmor AT-36N-XTP weighs only 18.2 pounds, making it the lightest option listed. The Rheem RTEX-36 is also very light at 19 pounds. Both units are easy to handle during installation due to their low weight profiles.