Bosch TR3500T 15B Small Storage Water Heater 15L Over-sink Open/Closed

The Bosch TR3500T 15B is a compact and efficient small storage water heater designed for over-sink installation. With a 15-liter capacity and 2 kW power output, it provides hot water on demand for hand washing and light kitchen duties. Its pressureless (unvented) design ensures safe operation, and the manual rotary knob allows easy temperature adjustment from 35 to 85 °C. The unit features a copper heating element and a polypropylene inner container for durability and corrosion resistance. Ideal for single sinks or small washbasins, this water heater combines reliability with energy efficiency class B.

Advantages

Compact over-sink design saves space; quick heating (approx. 33 min to 60°C); adjustable thermostat for customized comfort; IP24 splash-proof protection; easy installation with G 3/8 water connection.

Suitable for

• Kitchen sinks
• Bathroom washbasins
• Small offices or workshops
• RVs and caravans

Key specifications

• Capacity: 15 liters
• Power: 2 kW
• Voltage: 230 V / 50 Hz
• Energy efficiency class: B
• Temperature range: 35 - 85 °C
• Heating time to 60°C: approx. 33 min
• Water connection: G 3/8
• Protection class: IP24
• Control: manual rotary knob
• Heating element: copper
• Inner container: polypropylene
• Mounting: wall-mounted

Recommendations

For best performance, install the heater vertically above the sink and ensure the water pressure does not exceed the maximum operating pressure. Regular descaling may be required in hard water areas.