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Written from the listing's specs, not from our own use · How we rate
A compact 8.5 kW element is the headline feature of the Bosch Tronic 4000 (8.5 kW). It is a good match for a powder room, a garage sink or a tiny house, at 6.5/10 on its documented specs.
| Brand | Bosch |
|---|---|
| Category | Electric tankless water heaters |
| Fuel | Electric |
| Stated heating power | 8.5 kW |
| ASIN | B0BWK7W2YK |
Full listing title: Bosch Thermotechnology Tronic 4000 Electric Tankless Water Heater, 8.5 kW, White
| Fuel | ElectricFull listing title |
|---|---|
| Stated heating power | 8.5 kWFull listing title |
Rated from the listing's specs, no buyer reviews yet
What it's made for: a powder room, a garage sink or a tiny house.
Two electric tankless heaters of about the same power, closest to it on our rating, each with a dated price.
The heating power the listing states. On our calculator's maths it gives about 1.3 GPM of 105 °F water when the tap water comes in at 62 °F, and less in winter. That's a hand-wash sink with a low-flow aerator, not a kitchen tap.
One sink: about 1.3 GPM of 105 °F water with 62 °F tap water, on our calculator's maths. That's a hand-wash sink with a low-flow aerator.
A shower: no. A shower takes about 2 GPM, and 8.5 kW gives about 1.3 on a warm day.
We have no recent price on file for this listing, so we don't print an old one.
Count a plumber's visit and, unless it plugs in, an electrician for the circuit.
The button opens the exact listing (ASIN B0BWK7W2YK), where today's price, stock and seller apply.
Want the shower covered too? The Rheem 18 kW Electric, 240V (9.3/10) is an 18 kW whole-house unit.
A kitchen sink, not a hand basin? The ThermoMate 14 kW Electric, 240V (7.9/10) is rated 14 kW.
Want it to draw only what it needs? The Stiebel Eltron DHX 8-2 Trend, 7.2 kW (6.8/10) is self-modulating, per its listing.
Our take
The Bosch Tronic 4000 (8.5 kW) is about a compact 8.5 kW element, and it doesn't pretend to be more. No buyer reviews yet, so the Bosch Tronic 4000 (8.5 kW) has to win you over on paper. The catch with this Bosch point-of-use heater: no word on the breakers it needs or the flow. We'd pick the Bosch if the kitchen or the powder-room sink takes forever to run hot; otherwise, put it next to the Bosch Tronic 4000 (10.5 kW) first.
the unit on the wall next to the old tank's spot, water in and out. Under a sink or on the wall beside it, close to the tap it feeds.
Hot in a few seconds once the water in the pipes has passed. Set it, then leave it.
With 42 °F water coming in, 8.5 kW gives about 0.9 GPM at 105 °F on our calculator's maths. Low-flow shower heads stretch that further.
Clean the inlet screen and flush out scale on hard water. Our flushing and descaling guide has the routine.
Before the Bosch Tronic 4000 (8.5 kW) ships, check the tap it will feed: 8.5 kW suits one sink or a low-flow shower.
8.5 kW warms one sink or one low-flow shower, not two. Decide the fixture first, then check the flow it needs. Our point-of-use guide explains the trade-off.
At 240 V it needs a dedicated circuit; an electrician confirms the breaker and the wire.
Small units need a minimum flow to switch on. Ask the seller for that figure if you have low-flow aerators.
Electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.
How the Bosch Tronic 4000 (8.5 kW) stacks up against the closest alternative, the Bosch Tronic 4000 (10.5 kW).
| Criterion | Bosch Tronic 4000, 8.5 kW | Bosch Tronic 4000, 10.5 kW |
|---|---|---|
| Our rating | 6.5/10 | 6.5/10 |
| Heating power | 8.5 kW | 10.5 kW |
Both score 6.5/10. The Bosch Tronic 4000 (10.5 kW) adds more power (10.5 kW).
We rate it 6.5/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a heating power of 8.5 kW. The headline flow is a mild-weather number: with cold winter water coming in, the same unit gives you less. Read the maker's flow chart at your winter rise, or let our flow-rate calculator do the sums.
The listing doesn't state the voltage, so check the maker's documents. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.
Its listing states 8.5 kW for one tap. These are the seller's figures, not our measurements: how steady the temperature is in your shower and how it copes with your winter water can't be read from a listing.
Which tap: 8.5 kW warms one sink or one low-flow shower, not two. Decide the fixture first, then check the flow it needs. Our point-of-use guide explains the trade-off. Power: at 240 V it needs a dedicated circuit; an electrician confirms the breaker and the wire. Activation flow: small units need a minimum flow to switch on. Ask the seller for that figure if you have low-flow aerators. Scale: electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.