Stiebel Eltron 239221 Tempra 20 Plus Whole House Electric Tankless Water Heater
19.2 kW • 240/208V • High-Performance Whole-House Tankless System with Advanced Flow Control
The Stiebel Eltron Tempra 20 Plus (Part #239221) is a premium, high-output whole house electric tankless water heater engineered to deliver consistent temperature, increased flow capacity, and exceptional energy efficiency. Designed for 240/208V applications, this model is ideal for larger homes and light commercial environments where multiple fixtures require reliable, uninterrupted hot water.
Advanced Flow Control for Consistent Temperature
The standout feature of the Tempra Plus series is Stiebel Eltron’s patented Advanced Flow Control technology, which ensures stable water temperature even when demand exceeds capacity. Rather than allowing temperature fluctuations, the system automatically adjusts flow to maintain the selected temperature.
This results in:
- No cold water interruptions
- Consistent hot water during simultaneous use
- Enhanced comfort and performance in multi-fixture applications
Intelligent Self-Modulating Technology
The Tempra 20 Plus utilizes microprocessor-controlled self-modulating technology, which continuously adjusts power consumption based on flow rate and incoming water temperature. This ensures the unit uses only the energy necessary to meet demand, maximizing efficiency while maintaining reliable performance.
The system delivers smooth, consistent hot water output, even as usage conditions change.
High Output for Whole-House Demand
With a maximum output of 19.2 kW at 240V (14.4 kW at 208V), the Tempra 20 Plus is designed to handle multiple fixtures operating simultaneously, depending on climate and system design.
This higher capacity provides:
- Greater temperature rise in colder climates
- Improved flow performance across showers, sinks, and appliances
- Reliable hot water delivery during peak demand
The tankless design ensures endless hot water with no recovery time, eliminating the limitations of traditional storage systems.
Energy Efficiency Without Standby Loss
Operating at up to 99% efficiency, the Tempra 20 Plus converts nearly all electrical energy into usable hot water while eliminating standby heat loss. This results in:
- Reduced energy consumption
- Lower utility costs
- Improved overall system efficiency
Precision Digital Temperature Control
A front-facing digital temperature display allows precise adjustment and monitoring of water temperature. The system maintains consistent output regardless of flow fluctuations, ensuring reliable comfort and performance.
Compact, Space-Saving Design
Despite its increased output, the Tempra 20 Plus features a compact, wall-mounted design that requires no venting. This allows for flexible installation in utility rooms, closets, or tight mechanical spaces, maximizing usable space.
Durable Construction and Long-Term Reliability
Built with a high-quality copper heating system, the Tempra 20 Plus is engineered for durability and long-term performance. It includes advanced safety and reliability features such as:
- Overheat protection
- Self-monitoring electronics
- Durable, impact-resistant housing
- Minimal maintenance requirements
This ensures dependable operation in demanding residential and commercial environments.
Technical Specifications
- Power: 19.2 kW (240V) / 14.4 kW (208V)
- Voltage: 240/208V
- Amperage: ~80A (240V)
- Maximum Flow Rate: Up to ~3.5–4.0 GPM (depending on conditions)
- Temperature Range: Adjustable up to 140°F
- Connections: 3/4" NPT
- Efficiency: Up to 99%
- Compact wall-mounted design
Installation & Electrical Requirements
The Tempra 20 Plus requires a dedicated 240/208V electrical configuration, typically involving multiple breakers and sufficient service capacity. Installation should be performed by a licensed professional to ensure compliance with local codes and optimal performance.
The unit is UL listed, CSA compliant, and lead-free certified, ensuring safe and code-compliant operation.
Get the Best Price at ProDryers
When investing in a high-capacity tankless water heater with advanced temperature control, choosing the right supplier is critical. ProDryers is a trusted source for Stiebel Eltron products, offering expert guidance and competitive pricing.
Buy the Stiebel Eltron Tempra 20 Plus (239221) today at the best available price, or request a custom quote for volume or project pricing.
Contact ProDryers now to secure expert support, aggressive pricing, and a premium tankless solution engineered for consistent, efficient whole-house hot water.
