Bosch Tronic 6100 C 18
#16 in ElectricFull review
For a small home or apartment in a warm climate that wants the Bosch name. Most buyers get more power for the money elsewhere.
Amazon $585.46$585.46
2.5/5
For instant hot water at a kitchen or bathroom sink far from the main heater.
- 8.5 kWHeating power
- 1.6 GPMMax flow
- 0.92UEF
Check price at Amazon$229
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Tiny enough to mount inside most sink cabinets
- Three power levels let you trade flow for lower draw
- Heating element can be serviced and replaced
Cons
- Enough for a sink, not a shower
- Warranty terms are not split out for the heating element
The Bosch Tronic 4000 C family
Every Bosch Tronic 4000 C model we rank, smallest first. Ratings compare each against its own fuel.
| Model | Heating power | Rating | Price |
|---|---|---|---|
| Bosch Tronic 4000 C 8 (this one) | 8.5 kW | 2.5/5 | $229 |
| Bosch Tronic 4000 C 10 | 10.5 kW | 2.8/5 | $251.99 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its fuel. How we rank explains each one.
Specifications
| Model number | TR4000C-8 |
|---|---|
| Heating | |
| Fuel | Electric |
| Electric power | 8.5 kW |
| Max flow | 1.6 GPM |
| UEF | 0.92 |
| Installation | |
| Voltage | 240 V |
| Breakers | 40 A total |
| Weight | 4.4 lb |
| Features | |
| Built-in recirculation | No |
| Wi-Fi | No |
| Released | 2023-01 |
Alternatives in this fuel
Stiebel Eltron Tempra 15 Plus
#17 in ElectricFull review
For a small home or cabin on a 100 A service in a warm climate where a steady shower temperature matters more than flow. Homes with more service get more for the money from a Trend model.
Amazon $619$619
Rheem RTEX-11
#19 in ElectricFull review
For a single shower or a pair of sinks in a warm climate. The EcoSmart ECO 11 costs less and carries a lifetime warranty.
Amazon $268.99$268.99
Compare
Compare the Bosch Tronic 4000 C 8 with any other tankless water heater →
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