Electric Tankless hot water heaters are a great option for replacing your old hot water
heater. They are easy to install and require no venting and very little space to work. All they need is a large supply of electricity. Your house will need to have a large enough breaker box to support 220V 50 Amp circuit which is the same requirement of many of today’s electric ovens. Some units even require 3 60 Amp breakers. You very likely would need to have at least 200 Amp electric service with a large breaker boxto be able to handle these higher powered units. Make sure you also run the correct wiring to these units. They would need #8 or #6 wiring to support these units. Here are the requirements for the
Stiebel Eltron Tempra Models: ( the 20 is suitable for whole
| Model | Breaker | Maximum Amperage 240 V | Maximum Amperage @ 208 V | Recommended Household Electrical Service | Recommended Minimum Wire Gauge |
| Tempra 36 | 3 x 60 AMPS | 150 AMPS | 132 AMPS | 300 AMPS | 3 x #6 AWG Copper |
| Tempra 29 | 3 x 50 AMPS | 120 AMPS | 105 AMPS | 200 AMPS | 3 x #8 AWG Copper |
| Tempra 24 | 2 x 60 AMPS | 100 AMPS | 70 AMPS | 200 AMPS | 2 x #6 AWG Copper |
| Tempra 20 | 2 x 50 AMPS | 88 AMPS | 52 AMPS | 200 AMPS | 2 x #8 AWG Copper |
| Tempra 15 | 2 x 40 AMPS | 80 AMPS | 50 AMPS | 125 AMPS | 2 x #8 AWG Copper |
| Tempra 12 | 1 x 60 AMPS | 60 AMP | 44 AMPS | 100 AMPS | 1 x #6 AWG Copper |
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