---
product_id: 225180587
title: "Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6\" x 12.8\" x 2.9\", White"
brand: "bosch thermotechnology"
price: "₩40543"
currency: KRW
in_stock: false
reviews_count: 8
url: https://www.desertcart.kr/products/225180587-bosch-thermotechnology-7736505868-4-5kw-bosch-us4-2r-tronic-3000
store_origin: KR
region: South Korea
---

# 4.5 kW powerful heating 0.4 GPM ultra-low activation flow 360° flexible installation Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White

**Brand:** bosch thermotechnology
**Price:** ₩40543
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Hot water, no wait — power meets precision in a compact form!

## Quick Answers

- **What is this?** Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White by bosch thermotechnology
- **How much does it cost?** ₩40543 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/225180587-bosch-thermotechnology-7736505868-4-5kw-bosch-us4-2r-tronic-3000)

## Best For

- bosch thermotechnology enthusiasts

## Why This Product

- Trusted bosch thermotechnology brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Powerhouse:** Sleek 6.6" x 12.8" x 2.9" design fits tight spaces effortlessly.
- • **Efficient & Eco-Friendly:** 98% energy efficiency with zero standby heat loss saves you money and energy.
- • **Smart Low Flow Activation:** Activates at just 0.4 GPM, perfect for modern low-flow faucets.
- • **360° Installation Freedom:** Mount it any way you want for seamless under-counter integration.
- • **Instant Hot Water, Always Ready:** Endless, on-demand heating for one or multiple sinks without waiting.

## Overview

The Bosch Thermotechnology US4-2R Tronic 3000 is a 4.5 kW electric tankless water heater designed for instant, endless hot water delivery. Its ultra-compact size and 360-degree mounting flexibility make it ideal for tight commercial or office spaces. With a groundbreaking low activation flow rate of 0.4 GPM, it pairs perfectly with modern low-flow faucets. Boasting 98% efficiency and no standby heat loss, it offers an eco-conscious, cost-effective heating solution without the need for temperature or pressure relief valves.

## Description

Product Description               Upgrade your commercial (or residential) water heating solution with the Bosch US4-2R Tronic 3000 Electric Tankless Water Heater. This 4.5 kW under-sink tankless water heater is designed to provide an endless supply of instantaneous hot water to one or more sinks. This electric heater can be installed in a 360 degree orientation so you can position the unit in tight under counter spaces for a flexible, worry-free setup. The ultra compact and lightweight unit runs at 98% thermal efficiency, so stand-by loss is minimal. Plus, it does not require a temperature or pressure relief valve for your convenience. The roundagon Bosch DNA design provides a modern look that seamlessly blends in with existing decor when installed in a visible location and is built of durable plastic housing for long-lasting use. Due to the amperage requirement this item will be hard wired. It also includes a 5 year limited warranty on the copper heat exchanger and 2 year limited warranty for all other components so you know your purchase is protected. This water heater measures 6.6" x 12.8" x 2.9", making it the perfect size for light commercial applications such as shopping malls, airports, stadiums and offices. Save space and energy with the Bosch US4-2R Tronic 3000 Electric Tankless Water Heater!Bosch Thermotechnology is a leading source of high quality water heating and comfort systems. The company offers electric whole house and point-of-use water heaters, elcetric heatpump minisplit HVAC systems, and connected control thermostats. Bosch Thermotechnology is committed to being Simply Smart by offering products that work together as integrated systems that enhance quality of life in an ultra-efficient and environmentally friendly manner.                  Manufacturer Contact Information               800-283-3787

## Features

- NEW LOW ACTIVATION FLOW RATE: A new lower activation flow rate of only 0.4 GPM allows for use with newer, low flow faucets.
- ELECTRIC TANKLESS WATER HEATER: 4.5 kW under-sink tankless water heater designed to provide an endless supply of instantaneous hot water to one or more sinks
- FLEXIBLE INSTALLATION: Can be installed in a 360 degree orientation so you can position the unit in tight under counter spaces for a flexible, worry-free setup. Due to the amperage requirement this item will be hard wired.
- EFFICIENT DESIGN: Ultra compact and lightweight design with 98% efficiency and no stand-by heat loss plus does not require a temperature or pressure relief valve
- IDEAL SIZE: Measures 6.6" x 12.8" x 2.9", making it the perfect size for light commercial applications such as shopping malls, airports, stadiums and offices.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Bosch Thermotechnology |
| Product Dimensions | 12.8"W x 6.6"H |
| Special Feature | Lightweight |
| Color | White |
| Wattage | 4.5 KW |
| Voltage | 240 Volts |
| Maximum Flow Rate | 0.4 Gallons Per Minute |
| Heat Output | 4.5 Kilowatts |
| Efficiency | 98% efficient with no stand-by loss |
| Mounting Type | 360 degree mounting |
| Is Electric | Yes |
| Manufacturer | Bosch Thermotechnology |
| Item Depth | 6.6 inches |
| UPC | 052575112879 |
| Part Number | 7736505868 |
| Item Weight | 5.47 pounds |
| Item model number | 7736505868 |
| Size | 4.5 kW |
| Item Package Quantity | 1 |
| Special Features | Lightweight |
| Included Components | water heater |
| Batteries Required? | No |

## Product Details

- **Brand:** Bosch Thermotechnology
- **Product Dimensions:** 12.8"W x 6.6"H
- **Special Feature:** Lightweight
- **Color:** White
- **Wattage:** 4.5 KW

## Images

![Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White - Image 1](https://m.media-amazon.com/images/I/61yamo8j3RL.jpg)
![Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White - Image 2](https://m.media-amazon.com/images/I/717VDun41WL.jpg)
![Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White - Image 3](https://m.media-amazon.com/images/I/81KrjBXeq5L.jpg)
![Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White - Image 4](https://m.media-amazon.com/images/I/81+saZmIxrL.jpg)
![Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless Water Heater, 4.5 kW, 6.6" x 12.8" x 2.9", White - Image 5](https://m.media-amazon.com/images/I/61LvOeBKxTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The best in its category
*by N***O on October 30, 2022*

I was looking for days for a device that had the following characteristics: No water storage tank, small size, instant hot water, easy installation, to use in a sink. And this team was the best I found. Additionally, the brand gave me security. It has worked flawlessly since installation over a year ago, which is why I bought one more.

### ⭐ Worst Bosch device that I have ever purchased and I've had a few, from tools to appliances.
*by I***. on October 25, 2021*

EDIT: The unit is dead. The plunger that mechanically turns heaters on and off based on water flow has slowly stopped retreating after water shut-off which triggers thermal cutoff.Tronic 3000 models without thermostat will only work well only in specific, narrow, circumstances:constant water flowhigh water flow to reliably turn on the elementsconstant inlet water temperatureDeviation from above will cause temperature to fluctuate to uncomfortable levels.The unit itself is very simple in design: flow switch that engages, mechanically, via plunger, one or two switches that turn on the heating elements. This design suffers from turning off the heat too late which results in hot wave when turned on soon after, before elements/water inside of the unit cools off. On the positive side, I think the flow switch is well made, and of different design than other heaters I've seen and hopefully it'll last longer.Due to temperature fluctuations and no thermostat I would definitively not recommend it for shower installations. Otherwise, if you can maintain the flow and don't mind the 'heat wave' this unit will work with a sink, however, in my opinion it's overpriced for what you get (at this price other brands offer electronically controlled temperature).

### ⭐⭐⭐⭐ Not as advertised, BUT Bosch stepped up to fix it
*by M***E on March 4, 2022*

I put this on the sink in my shop. First off, it did not work at all. I then found that the factory side of the wiring that goes into the junction block was never connected in the block. I fixed that, then... With the high/low switch on high, if I run the water as slow as I can, so the valve in this heater opens to turn on the heater, it will WARM up the water. It does not make any HOT water. I wasn't expecting this to heat the water to hot, but it barley warms it. Maybe only one leg of the 240v system is working. I have about 16 days left in my 30 return window to decide what to do with this not very impressive unit.Here is an update.I contacted Bosch, and talked to Matt (multiple times) in the tech dept, who was very helpful. After some testing on the unit, it was determined that the wire that should be connected to the heating coil, was not. It looked like it was, but was hidden under the wire cover. He wanted me to ship this back to Bosch. I noticed that the box it came in had an X drawn in pen on the front, and what appeared to be a defective merchandise label on it. I think someone else bought this unit, it didn't work, and returned it to Amazon, who then resold it to me. Bosch sent me a new one, and this one came with the factory wires in the junction block not connected, and a screw holding the heating unit to the backing plate was stripped out and floating around the unit. They sent me another one, and this one seems to be working much better. You can't run the water wide open, but slow it down a little and it warms the water good enough for hand washing. Matt said there have been a lot of assembly problems, that they are trying to fix. Maybe some of the other bad reviews here had this same problem. Call Bosch and they will work with you to get it fixed.

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-30*