Stiebel Eltron Tempra 29 Plus Tankless Water Heater - On Demand Hot

In this review of the Stiebel Eltron Tempra 29 Plus the bottom line is clear: this is a high-capacity electric tankless water heater for homeowners who want continuous, stable hot water and are prepared for a robust electrical installation. The Tempra 29 Plus delivers on-demand hot water with German-designed Advanced Flow Control that maintains set temperature under changing flow conditions, and it saves space with a vent-free, compact design. For those able to meet the dedicated breaker and service requirements, it offers reliable performance and meaningful energy savings compared with conventional tank heaters.

Key Features

• Advanced Flow Control: Automatically adjusts flow to maintain the set temperature so showers stay comfortable even when demand spikes.
• On-demand hot water: Provides a continuous and effectively unlimited supply of hot water for multiple applications without a storage tank.
• Compact, vent-free design: Saves space and can be mounted where a bulky tank would not fit, with no venting required.
• Temperature memory presets: Two programmable presets make it easy to return to personalized water temperatures for different household needs.
• High electrical capacity: Supports a maximum draw of 28,800 watts at 240 V (21,600 W at 208 V) for strong flow and temperature rise when installed correctly.
• Energy efficiency: Typically uses 15-20% less energy than conventional electric tank heaters by eliminating standby heat loss.

Who It's For

The Tempra 29 Plus is best for homeowners with a large household or high simultaneous hot water demand who have or can provide a minimum 200 amp service and install three dedicated 40 amp breakers with 8 gauge copper wiring. It suits anyone who values steady temperature control, compact installation, and energy savings over a conventional tank heater.

It is not ideal for owners without sufficient electrical service or those unwilling to arrange a hard-wired 208/240 V installation. Smaller homes with low hot water demand may find the unit oversized and could opt for a lower-capacity model to reduce installation cost.

Pros & Cons

Pros

• Instant, continuous hot water with stable temperatures praised by customers.
• Space-saving, vent-free design that frees up garage or utility area space.
• Energy-efficient operation that can lower monthly electricity bills versus tank heaters.

Cons

• Requires substantial electrical capacity and three dedicated 40 amp breakers, which may add installation cost for some homes.

Specifications

Brand	Stiebel Eltron
Model	Tempra 29 Plus
Power draw	Up to 28,800 W at 240 V (21,600 W at 208 V)
Electrical requirement	Hard-wired 240 or 208 V service; three dedicated 40 A breakers with 8 gauge copper wiring
Service minimum	Minimum 200 amp total service to the residence
Features	Advanced Flow Control, two temperature memory presets, vent-free

Our Verdict

The Tempra 29 Plus is a high-performing electric tankless heater that delivers consistent temperature control and energy savings for larger households with sufficient electrical service. It represents good value for buyers who can accommodate the dedicated breaker and service requirements and who want a compact, reliable source of on-demand hot water.

Frequently Asked Questions

Does this unit require venting?
No, the Tempra 29 Plus is a vent-free electric tankless water heater and does not require venting.

What electrical service is needed?
The unit requires hard-wired 240 or 208 V service with a maximum draw up to 28,800 W at 240 V and three separate dedicated 40 A breakers with 8 gauge copper wiring, plus a minimum 200 amp residence service.

Will it save energy compared to a tank heater?
Yes, it typically uses 15-20% less energy than conventional electric tank water heaters by eliminating standby heat loss, with potential for greater savings depending on usage.