6 Best Alternatives to the Stiebel Eltron Tempra 36 PLUS Electric Tankless Water Heater (2026)
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The stiebel eltron tempra 36 plus electric tankless water heater is a solid choice for electric-only homes. It works well for users who prioritize space savings and reliable electric heating. However, you might need a different spec, size, or brand to fit your unique situation. Some homes lack the electrical infrastructure for high-power units. Others require point-of-use solutions for single sinks rather than whole-house coverage. The alternatives listed here were chosen because their specs overlap with the original. This ensures you find a comparable device that matches your power source and capacity needs. You can explore options that offer different voltages or compact footprints. Some models provide dual-fuel flexibility for RV applications. Others focus on precise temperature control for small spaces. This guide helps you compare these 6 best alternatives to the stiebel eltron tempra 36 plus electric tankless water heater (2026). You will find practical choices based on published specifications. The list covers electric, gas, and dual-fuel options. Each product is ranked by how well it meets common household demands. You can select a unit that fits your installation constraints. The goal is to help you make an informed decision based on data.
Our top pick: Stiebel Eltron Tempra 36 Plus Electric Water Heater.
How these options differ from the Tempra
Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank
The Thermomate 6.5-Gallon Mini-Tank targets single-sink applications rather than whole-house needs. It operates on 120V power, which simplifies installation compared to the high-voltage requirements of the Tempra 36 Plus. Its compact dimensions of 14.6 by 17.7 inches allow it to fit under sinks where space is tight. You gain reliable point-of-use heating for low-demand fixtures. However, you give up the endless hot water capacity of a tankless unit. This heater cannot support showers or multiple simultaneous taps. Choose this if you need dedicated hot water for one faucet and have limited electrical capacity.
Suburban 6-Gallon Gas and Electric RV Water Heater
The Suburban 6-Gallon RV Water Heater is built for mobile living and dual-fuel flexibility. It uses both electric and gas power sources, offering reliability when camping or traveling. Its cubic shape measures 12.7 inches on each side, making it easy to mount in tight RV compartments. You gain corrosion protection and power options that tankless units often lack. However, you sacrifice the on-demand efficiency of the Tempra. This is a tank-style heater with a smaller usable capacity of 4.0 gallons. Pick this if you travel frequently and need a durable, versatile water solution that works off-grid or on shore power.
Rheem 18kW 240V Electric Tankless Water Heater
The Rheem 18kW Electric Tankless Water Heater offers a more compact footprint for whole-house heating. It measures only 3.5 inches in height, fitting easily in tight spaces like closets or utility rooms. It requires 240V power and delivers precise temperature control for homes with moderate hot water demands. You gain a smaller physical profile while maintaining electric efficiency. However, it may struggle with high-flow scenarios compared to higher-kilowatt models. Choose this if you have 240V power available and need a space-saving solution for a small household with standard usage patterns.
Camplux 6-Gallon 120V Mini-Tank Water Heater
The Camplux 6-Gallon Mini-Tank provides a practical solution for low-demand applications like bathroom sinks. It operates on standard 120V electricity, making installation straightforward without upgrading your electrical panel. Its white exterior blends into most utility spaces, and its dimensions of 15.8 inches square fit well under counters. You gain a reliable, compact heater for point-of-use needs. However, you give up the continuous flow of the Tempra 36 Plus. This unit is not suitable for showers. Select this if you need hot water for a single sink and prioritize easy installation over high output capacity.
VEVOR 6-Gallon 1600W Electric Water Heater
The VEVOR 6-Gallon Electric Water Heater is designed for supplementary hot water in small spaces. It runs on 120V power, simplifying setup for kitchens or RVs. Its gray finish and compact size of 14.2 inches square make it unobtrusive in utility areas. You gain a reliable, low-maintenance option for point-of-use heating. However, you sacrifice the endless hot water supply of a tankless system. This tank-style heater has a limited capacity of 4.0 gallons. Choose this if you need basic hot water for a sink or small application and want to avoid the complexity of high-voltage tankless installations.
Thermomate 18kW Electric Tankless Water Heater
The Thermomate 18kW Electric Tankless Water Heater is built for high-flow indoor whole-house heating. It requires 240V power and delivers consistent hot water for busy households. Its gray exterior and compact dimensions of 13.1 inches square fit well in utility rooms. You gain reliable performance for multiple simultaneous uses, similar to the Tempra. However, it demands adequate breaker space and electrical infrastructure. This unit is best for homes with strong electrical systems. Pick this if you need high-volume hot water for a whole house and have the necessary electrical capacity to support an 18kW unit.
Quick picks
Our 7 picks
Stiebel Eltron Tempra 36 Plus Electric Water Heater
Best for: electric homes needing space savings
- Fuel Type
- Electric
View on Amazon: Stiebel Eltron Tempra 36 Plus Electric Water Heater Affiliate link
The Stiebel Eltron Tempra 36 PLUS is an electric tankless water heater designed for on-demand hot water. It operates on electric fuel type. This unit provides continuous heating without a storage tank, making it suitable for spaces where saving room is a priority. It fits homes looking for a reliable electric solution for point-of-use or whole-house heating needs.
Pros
- Electric fuel type for easy integration
- Tankless design saves physical space
- On-demand hot water capability
Cons
- Electric models may struggle in very cold climates
- Requires dedicated high-amperage circuit
- Limited data on flow rate specifics
Good fit if
- You want a compact electric heater
- You need on-demand hot water
- You have adequate electrical capacity
Skip if
- You prefer gas fuel sources
- You need a storage tank
- You have limited electrical service
Verdict: Stiebel Eltron Tempra 36 PLUS Electric Tankless is a solid choice for electric-only homes. It works well for users who prioritize space savings and reliable electric heating.
Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank
Best for: single sink point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 1.44 kW
- Capacity
- 6.5 Gallons
- Voltage
- 120V
- Temperature Control
- 50°F to 149°F
- Certification
- UL Listed
View on Amazon: Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank Affiliate link
This Thermomate unit is a 6.5-gallon electric point-of-use heater designed for under-sink installation. It operates on 120V power with a 1.44 kW heating element, reaching temperatures between 50°F and 149°F. The glass-lined tank offers 99% thermal efficiency and includes a freeze mode. Its compact 17.7 x 17.7 x 14.6-inch footprint allows for easy wall or floor mounting near sinks.
Pros
- 6.5-gallon capacity for point-of-use hot water
- 120V plug-in connection for easy installation
- Adjustable thermostat from 50°F to 149°F
- Glass-lined tank with UL Listed certification
Cons
- Low 1.44 kW wattage limits flow rate
- Small 6.5-gallon tank requires recovery time
- Short 1-year warranty on parts
Good fit if
- You need hot water for a single sink
- You have a standard 120V outlet nearby
- You want a compact under-sink solution
Skip if
- You require high flow for showers
- You need whole-house heating
- You want a long-term parts warranty
Verdict: Thermomate 6.5 Gallon Mini Tank Water Heater fits single-sink applications where space is limited and 120V power is available. It provides reliable point-of-use heating but cannot support high-demand fixtures like showers.
Suburban 6-Gallon Gas and Electric RV Water Heater
Best for: RVers needing durable, dual-fuel hot water
- Fuel Type
- Electric, Gas
- BTU
- 12,000 BTU/h
- Wattage
- 1,440 W
- Capacity
- 6 Gallon
- Dimensions
- 12.69 x 12.69 x 19.19 in
- Use
- RV
View on Amazon: Suburban 6-Gallon Gas and Electric RV Water Heater Affiliate link
The Suburban SW6DE is a 6-gallon tank water heater built for RV use. It features a porcelain-lined steel tank with a replaceable anode rod for corrosion protection. You can power it with 12,000 BTU gas or a 1,440-watt electric element. The unit measures 12.7 inches wide and weighs 32.9 pounds. It offers a 2-year limited warranty on parts and a 3-year warranty on the tank.
Pros
- Porcelain-lined steel tank for durability
- Dual fuel options: 12,000 BTU gas or 1,440W electric
- Replaceable anode rod simplifies maintenance
- Optimized heat transfer via flue tube design
Cons
- Small 6-gallon capacity limits simultaneous use
- Heavier build at 32.9 pounds
- Shorter 2-year parts warranty compared to tankless models
Good fit if
- You need reliable hot water in an RV
- You want flexibility between gas and electric power sources
- You prefer a durable tank-style heater with corrosion protection
Skip if
- You require unlimited hot water for multiple showers
- You need a compact unit under 10 pounds
- You want a tankless system for space savings
Verdict: Suburban 6-Gallon RV Water Heater is a durable, dual-fuel option for RVers who need a reliable tank-style heater. It suits those who value corrosion protection and power flexibility over the endless hot water of tankless units.
Rheem 18kW 240V Electric Tankless Water Heater
Best for: Compact whole-house electric hot water needs
- Fuel Type
- Electric
- Flow Rate
- 4.4 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- ±1°F
- Dimensions
- 3.5 x 14.5 x 18.5 inches
View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater Affiliate link
The Rheem RTEX-18 is a 240V electric tankless unit designed for whole-house use. It delivers up to 4.4 GPM with 18 kW of power. The external digital thermostat offers ±1°F accuracy. Its compact 3.5-inch depth fits tight spaces. You get simple installation with bottom 3/4-inch NPT connections. This model suits homes needing reliable, on-demand hot water without a bulky tank.
Pros
- 18 kW heating power for whole-house use
- Up to 4.4 GPM flow rate
- Digital thermostat with ±1°F accuracy
- Compact 3.5-inch depth for easy mounting
Cons
- Requires a 240V electrical circuit
- No built-in remote control
- Limited to electric fuel type
Good fit if
- You need a compact unit for tight spaces
- You want precise temperature control
- You have a 240V electrical supply
Skip if
- You require gas fuel type
- You need more than 4.4 GPM flow
- You only have 120V outlets
Verdict: Rheem 18kW Electric Tankless Water Heater fits homes with 240V power seeking compact, precise temperature control. It delivers reliable whole-house hot water without the bulk of a tank.
Camplux 6-Gallon 120V Mini-Tank Water Heater
Best for: single sink point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 1,440 W
- Capacity
- 6 gallons
- Voltage
- 120 V
- Temperature Control
- 50°F to 149°F
- Certification
- UL, CSA
View on Amazon: Camplux 6-Gallon 120V Mini-Tank Water Heater Affiliate link
This Camplux 6-gallon point-of-use water heater delivers 1,440 watts of heating power on a standard 120-volt circuit. It features a glass-lined tank for durability and adjustable thermostat settings ranging from 50°F to 149°F. The compact 18-inch height allows for under-sink mounting. It suits you if you need reliable hot water for a single sink or small bathroom without requiring high-amperage electrical upgrades.
Pros
- 1,440W heating element provides efficient point-of-use hot water
- Glass-lined tank protects against corrosion for long service life
- Adjustable thermostat allows precise temperature control from 50°F to 149°F
- UL and CSA certified for safety compliance
Cons
- 6-gallon capacity is limited to single-fixture use
- 1,440W output is slower than high-capacity tankless models
- 2-year parts warranty is shorter than industry standards
Good fit if
- You need a compact heater for under-sink installation
- You have only a 120V outlet available
- You want a durable glass-lined tank
Skip if
- You need simultaneous hot water for multiple fixtures
- You require high-volume hot water for a shower
- You want a longer warranty period
Verdict: Camplux 6 Gallon Electric Mini Tank is a practical solution for low-demand applications like a bathroom sink. It fits buyers who prioritize compact size and standard voltage compatibility over high output capacity.
VEVOR 6-Gallon 1600W Electric Water Heater
Best for: supplementary hot water in small spaces
- Fuel Type
- Electric
- Wattage
- 1600 W
- Capacity
- 6 gal
- Voltage
- 120 V
- Dimensions
- 22.6 x 14.2 x 14.2 inches
- Weight
- 30.9 pounds
View on Amazon: VEVOR 6-Gallon 1600W Electric Water Heater Affiliate link
This VEVOR unit is a 6-gallon electric tank water heater designed for point-of-use applications. It operates on 120V with 1600W of power, making it suitable for single apartments, RVs, or as a supplementary source for guest bathrooms and kitchen sinks. The 20 mm foam insulation helps maintain temperature and save energy. It features an LED display and rotary knob for easy adjustment. Its compact size allows for flexible installation under sinks or in storage rooms.
Pros
- 6-gallon capacity for light cleaning and handwashing
- 120V/1600W power for standard household outlets
- 20 mm foam insulation minimizes heat loss
- LED display shows heating status clearly
- IPX4 waterproof rating for safety
Cons
- 1600W heating element is slower than high-output tankless models
- 6-gallon tank requires recovery time between uses
- Manual rotary knob lacks precise digital temperature control
Good fit if
- You need a supplementary hot water source for a guest bathroom
- You are installing in an RV or small apartment with limited space
- You want a simple setup with an LED display for status monitoring
Skip if
- You require continuous hot water for multiple simultaneous fixtures
- You need a high-flow tankless heater for whole-house supply
- You prefer digital precision over manual knob adjustment
Verdict: VEVOR 6-Gallon Electric Point-of-Use Heater is a practical choice for low-demand applications like kitchen sinks or RVs. It fits buyers who need reliable, compact hot water without the complexity of high-voltage tankless systems.
Thermomate 18kW Electric Tankless Water Heater
Best for: High-flow indoor whole-house heating
- Fuel Type
- Electric
- Flow Rate
- Up to 4.4GMP
- Wattage
- 18kW
- Installation Location
- Indoor
- Voltage
- 240V
- Temperature Control
- 80°F to 140°F, ±1°F
View on Amazon: Thermomate 18kW Electric Tankless Water Heater Affiliate link
This ThermoMate unit delivers instant hot water at 18kW and 240V. It provides up to 4.4 GPM flow, making it suitable for whole-house use. The digital display allows precise temperature adjustments in 1-degree increments from 80°F to 140°F. Its compact, wall-mounted design saves floor space. You get ETL certification for safety, including overheating protection and auto-stop features when no water is detected.
Pros
- 18kW power output for high flow rates
- Digital control with 1-degree temperature increments
- ETL certified with overheating protection
- Compact wall-mounted design saves space
Cons
- Requires two double-pole 40A breakers
- Needs 8AWG wire gauge for installation
- Limited to indoor installation only
Good fit if
- You need high flow rates for multiple fixtures
- You have the electrical capacity for 80A service
- You want precise digital temperature control
Skip if
- You only have a single 40A circuit available
- You require outdoor installation capabilities
- You prefer analog temperature dials over digital displays
Verdict: ThermoMate 18kW Electric Tankless Water Heater suits homes with strong electrical infrastructure. It provides reliable, high-volume hot water for busy households. Buyers with adequate breaker space will find it efficient.
Specifications side by side
| Spec | Stiebel Eltron Tempra 36 Plus Electric Water Heater | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank | Suburban 6-Gallon Gas and Electric RV Water Heater | Rheem 18kW 240V Electric Tankless Water Heater | Camplux 6-Gallon 120V Mini-Tank Water Heater | VEVOR 6-Gallon 1600W Electric Water Heater | Thermomate 18kW Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric, Gas | Electric | Electric | Electric | Electric |
| Flow Rate | not stated | not stated | not stated | 4.4 GPM | not stated | not stated | Up to 4.4GMP |
| BTU | not stated | not stated | 12,000 BTU/h | not stated | not stated | not stated | not stated |
| Wattage | not stated | 1.44 kW | 1,440 W | 18 kW | 1,440 W | 1600 W | 18kW |
| Installation Location | not stated | not stated | not stated | not stated | not stated | not stated | Indoor |
| Capacity | not stated | 6.5 Gallons | 6 Gallon | not stated | 6 gallons | 6 gal | not stated |
| Voltage | not stated | 120V | not stated | 240 V | 120 V | 120 V | 240V |
| Temperature Control | not stated | 50°F to 149°F | not stated | ±1°F | 50°F to 149°F | not stated | 80°F to 140°F, ±1°F |
| Certification | not stated | UL Listed | not stated | not stated | UL, CSA | not stated | ETL |
| Dimensions | not stated | 17.7"H x 17.7"W x 14.6"D | 12.69 x 12.69 x 19.19 in | 3.5 x 14.5 x 18.5 inches | 18 x 15.75 x 15.5 inches | 22.6 x 14.2 x 14.2 inches | 17.12" x 13.12" x 3.12" |
| Use | not stated | Under Sink | RV | Whole House | not stated | not stated | not stated |
| Weight | not stated | 26.5 pounds | 32.9 pounds | 14.8 pounds | 25.4 pounds | 30.9 pounds | not stated |
| Size | not stated | 6.5 Gallon | 6 Gallon | Small | not stated | 6 Gal | 240V/18kW |
| Color | not stated | white,blue | Steel | Gray | White | Gray | Gray |
| Model | not stated | ES700 | 5239A | RTEX-18 | ME60 | FJI-POR-30S2 | ET180 |
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Frequently asked questions
Can I install the Thermomate 6.5-Gallon Mini-Tank myself?
Yes, the Thermomate 6.5-Gallon Mini-Tank is designed for easy point-of-use installation. It operates on standard 120V power, which simplifies wiring compared to high-voltage tankless units. Its compact size of 14.6 by 17.7 inches allows it to fit under most sinks. This makes it a practical choice for single-sink applications where space is limited and you need reliable hot water without complex electrical upgrades.
Is the Rheem 18kW unit suitable for whole-house use?
The Rheem 18kW Electric Tankless Water Heater is built for compact whole-house hot water needs. It requires 240V power and delivers 18 kW of heating capacity. Its small dimensions, measuring 14.5 by 18.5 inches, allow for flexible mounting. This unit provides precise temperature control and reliable performance for households that need consistent hot water without the bulk of a traditional tank system.
Does the Suburban RV heater work on propane?
The Suburban 6-Gallon RV Water Heater is a dual-fuel option. It supports both electric and gas operation, providing flexibility for RVers. The unit features a 6-gallon capacity and durable steel construction. It measures 12.7 inches on each side and weighs 32.9 pounds. This design offers corrosion protection and power flexibility, making it suitable for those who value reliability over the endless hot water of tankless units.
What is the weight of the Camplux 6-Gallon Mini-Tank?
The Camplux 6 Gallon Electric Mini Tank weighs 25.4 pounds. Its compact dimensions are 15.8 by 18 inches, making it easy to place in tight spaces. This unit is ideal for low-demand applications like bathroom sinks. It prioritizes compact size and standard voltage compatibility over high output capacity, ensuring practical hot water access without requiring significant space or complex electrical infrastructure.
Can the VEVOR 6-Gallon heater be used in an RV?
Yes, the VEVOR 6-Gallon Electric Point-of-Use Heater is suitable for RVs. It operates on 120V power and provides reliable, compact hot water. The unit measures 14.2 by 22.6 inches and weighs 30.9 pounds. It is designed for low-demand applications like kitchen sinks. This makes it a practical choice for buyers who need simple hot water solutions without the complexity of high-voltage tankless systems.
Is the Thermomate 18kW unit safe for indoor installation?
The Thermomate 18kW Electric Tankless Water Heater is designed for indoor installation. It requires 240V power and delivers 18 kW of heating capacity. Its compact size of 13.1 by 17.1 inches allows for efficient mounting in utility spaces. This unit suits homes with strong electrical infrastructure, providing reliable, high-volume hot water for busy households while maintaining a small footprint.
How does the Rheem unit compare in size to the Tempra 36 Plus?
The Rheem 18kW unit is notably compact, measuring 14.5 by 18.5 inches. It weighs only 14.8 pounds, making it lighter and smaller than many traditional tankless heaters. This design fits homes with 240V power seeking precise temperature control. It delivers reliable whole-house hot water without the bulk of a tank, offering a streamlined solution for space-conscious households.