What it delivers
The Stiebel Eltron Mini 3.5-1 3.5 kW Point-of-Use Tankless Water Heater is a point-of-use electric tankless rated at 3.5 kW on 120 volts. Its listing gives a maximum flow of 2.0 GPM.
Worked out from its input, it delivers roughly 0.5 GPM when the water only has to rise 45°F, and 0.3 GPM at a 70°F winter rise: less than one 2 GPM shower in summer, less than one 2 GPM shower in winter. Check your house in the planner.
At 120 volts 3.5 kW is about 29 amps. The requirement calculator shows it at 208 V too; an electrician confirms the panel.
Point-of-use units go under or beside one sink, where a short pipe run means hot water in seconds.
Other listed details: features: Requires 40A circuit breaker; model: Mini 3.5-1; warranty: Limited 7-year against leakage. See MFG for warranty details.
The listing gives dimensions of 13 in (W) x 6.3 in (H) and a weight of 0.27 g.
Warranty, per the listing: Limited 7-year against leakage. See MFG for warranty details.
Right unit for this house?
Install it when
- One sink or a low-flow shower
- A far bathroom with a long wait for hot water
Look at another unit when
- Whole-house hot water
- Kitchen sinks at full flow in cold climates
Strengths and trade-offs
Strengths
- 3.5 kW
- Up to 2.0 GPM
- No venting or gas line
Trade-offs
- Weak at a large winter rise
- Breaker needs not stated
Install limits
- Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.
Rated performance
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Model number | Mini 3.5-1 | Retailer |
|---|---|---|
| Dimensions (seller) | 13"W x 6.3"H | Retailer |
| Features (seller) | Requires 40A circuit breaker | Retailer |
| Power | 3.5 kW | Retailer |
| Voltage | 120 V | Retailer |
| Max flow (maker) | 2 GPM | Retailer |
| Product weight | 0.27 g | Retailer |
| Warranty | Limited 7-year against leakage. See MFG for warranty details | Retailer |
Rival units at this flow
More point-of-use water heaters rated for similar demand
- Camplux TE06ProN2 6 kW Point-of-Use Tankless Water Heater
- Camplux TE06ProN5 6 kW Point-of-Use Tankless Water Heater
- VEVOR JN08 8 kW Point-of-Use Tankless Water Heater
- HNK D3548A11 3.5 kW Point-of-Use Tankless Water Heater
Full point-of-use water heaters spec grid · Every Stiebel Eltron unit in the catalog
Final verdict
A sensible point-of-use electric tankless for one sink or a low-flow shower.
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