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Stiebel Eltron Tempra 29 Plus Whole House Electric Tankless Water Heater - 239223

SKU 239223
Original price $999.00 - Original price $999.00
Original price
$999.00 - $999.00
Current price $999.00
in stock

The Tempra® 29 Plus line features a unique Advanced Flow Control function, which ensures that you’ll never be surprised by a cold shower. It also features two different temperature memory presets, making it easy to adjust for personalized needs. Thanks to these and other innovations, the Tempra® Plus ensures that you’ll enjoy endless hot water along with unrivaled efficiency. (240/208V, 28.8 kW copper tankless electric w. Advanced Flow Control)

Tempra® Plus has self-modulation. Self-modulation ensures that only the least amount of energy is used at all times. The Advanced Flow Control function ensures a steady output temperature even if flow rates vary up or down, like when hot water is being used and an additional tap is opened or closed. 


  • Proven reliability from the world leader
  • Unlimited supply of hot water
  • Sleek design saves space
  • No venting required
  • Provides continuous hot water on demand
  • Saves energy-with auto-modulation
  • 7/3-year warranty
  • Tempra® Plus features exclusive Advanced Flow Control, invented by Stiebel Eltron and awarded German patent DE 3805441 C2 and other patents

Delivery time / Order Processing & Shipping Times

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Tempra Model Item Number15 Trend 239214
15 Plus 239220
20 Trend 239215
20 Plus 239221
24 Trend 239216 
24 Plus 239222
29 Trend 239217
29 Plus 239223
36 Trend 239218 
36 Plus 239225
Phase - 50/60 HzSingle (6) 50/60 HzSingle (6) 50/60 HzSingle (6) 50/60 HzSingle (6) 50/60 HzSingle (6) 50/60 Hz
Voltage240 V or 208 V240 V or 208 V240 V or 208 V240 V or 208 V240 V or 208 V
Minimum Main Service Required  150 A200 A300 A
Wattage14.4 kW10.8 kW19.2 kW14.4 kW24 kW18 kW3 x 40 A3 x 35 A36 kW27 kW
Amperage2 x 30 A2 x 26 A2 x 40 A2 x 35 A2 x 50 A2 x 44 A3 x 40 A3 x 35 A3 x 50 A3 x 44 A
Number & min. recommended 
size of circuit breakers (1) (DP)
2 x 30 A2 x 40 A2 x 35 A2 x 50 A3 x 40 A3 x 35 A3 x 50 A
Number of runs & min. recommended
wire size (2) (copper)
2 x 10/2 AWG2 x 8/2 AWG2 x 8/2 AWG3 x 8/2 AWG3 x 8/2 AWG
Maximum Flow Rate at Ambient Water Temperature42°F1.6GPM2.1 GPM2.6 GPM3.1 GPM3.9 GPM
52°F1.9 GPM2.5 GPM3.1 GPM3.7 GPM4.6 GPM
62°F2.4 GPM3.1 GPM3.8 GPM4.6 GPM5.7 GPM
72°F3.1 GPM4 GPM5 GPM6 GPM7.5 GPM
Maximum temperature increase 
above ambient water temp
@ 1.50 GPM65 °F49 °F88 °F66 °F92 °F82 °F92 °F92 °F92 °F92 °F
@ 2.25 GPM43 °F37 °F58 °F44 °F73 °F54 °F87 °F66 °F92 °F82 °F
@ 3.00 GPM33 °F25 °F44 °F33 °F54 °F41 °F66 °F49 °F82 °F61 °F
@ 4.50 GPM--29 °F22 °F37 °F27 °F44 °F33 °F55 °F41 °F
Min. water flow to activate unit0.50 gpm (1.9 l/min)0.50 gpm (1.9 l/min)0.50 gpm (1.9 l/min)0.77 gpm (2.9 l/min)0.77 gpm (2.9 l/min)
Weight16.1 lb (7.3 kg)16.1 lb (7.3 kg)16.1 lb (7.3 kg)19.0 lb (8.6 kg)19.0 lb (8.6 kg)
Nominal water volume0.26 gal (1.0 l)0.26 gal (1.0 l)0.26 gal (1.0 l)0.39 gal (1.5 l)0.39 gal (1.5 l)
Max. inlet water temperature131 °F (55 °C)
DimensionsWidth 165 /8˝ (42.0 cm) x Height 14½˝ (36.9 cm) x Depth 45 /8˝ (11.7 cm)
Minimum pressure30 psi (2 bar)
Working pressure150 psi (10 bar)
Tested to pressure300 psi (20 bar)
Water connections¾˝ NPT


1. Overcurrent protection sized at 100% of load. Tankless water heaters are considered a non-continuous load. 

2. Copper conductors with a temperature rating of 75 °C or greater must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load. 

3. Requires minimum 150 A main service. 

4. Requires 200 A main service. 

5. Requires 300 A main service. 

6. 29 Trend/Plus & 36 Trend/Plus may be wired for balanced 3-phase 208 V. 15 Trend/Plus, 20 Trend/Plus, 24 Trend/Plus may be wired for unbalanced 3-phase 208 V

Use and care/Warranty Information

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