Bosch Tronic Heat 3500, 12 kW + WD 120

Product detailed description

The concept of intuitive boiler control ensures simple operation and running. The clearly

laid-out control panel with buttons and a graphic display is user-friendly and makes every

step of operation effortless.

 

Technology that makes your life easier

The Tronic Heat 3500 electric boiler is light and relatively compact. This makes installation especially

easy. It is so easy that hanging the boiler and connecting it can be done by you or a professional installer alone, without further help. Maintenance of the boiler is also an easy task. By removing a few screws you gain access to all the important components. This makes it possible, for example, to carry out work on the pump without having to remove the electronics. Maintenance is also not time-consuming, which saves time not only for you but also for the service technician.

 

Overview of all advantages

▶ Tronic Heat 3500 with an expansion vessel and an energy-efficient pump

▶ Available in 7 outputs, from 4 to 24 kW

▶ Simple installation and low-maintenance operation

▶ Compact dimensions and low weight

▶ Modern functional design

▶ Simple and convenient control concept

▶ Intelligent electronics with self-diagnostics and smart functions

 

Dimensions and connections

 

 

 

Inside view

 

 

 

1 Expansion vessel

2 Boiler frame

3 Power switching relay

4 STB (safety thermostat)

5 Display

6 Pump

7 Automatic air vent valve

8 Insulated heat exchanger

9 Hydraulic piping

10 Pressure switch

11 Safety valve

12 Hydraulic and electrical connections

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Technical data

Front design colour: white

Max. rated heat output: 12 kW

Output stages: 3 pcs x 4.0 kW

Fuse rating upstream of the boiler: 20.0 A

Mains voltage: 3 x 400 (-10%/+6%) V AC

Seasonal space heating energy efficiency

according to ErP15: 36%

Energy efficiency class: D

Equipment

Expansion vessel: 7.0 l

High-efficiency pump EEI ≤ 0.23: integrated

Dimensions and weight

Height: 712 mm

Width: 330 mm

Depth: 273 mm

Net weight: 17 kg

 

 

BOSCH WD 120 - tank

 

• stationary, rectangular
• inner tank: enamelled steel 
• capacity: 115 l
• heat output of heating coil: 25.1 kW
• max. operating pressure: 10 bar
• heating time at 18 kW output: 25 minutes
• weight without water: 50 kg
• replaceable magnesium anode: yes
• dimensions (H x W x D): 951 x 500 x 585 mm 
• rated overpressure: 0.6 MPa
• safety valve: yes
• energy class: B

 

Frequently Asked Questions

• How do I choose the right output for a BOSCH electric boiler? As with gas boilers, base your choice on the calculated heat loss of the building to be heated. For electric boilers it is also crucial to check whether the capacity of your electrical connection to the house (flat) allows it - higher outputs (from roughly 12 kW upwards) usually require a three-phase 400 V connection and a correspondingly sized main circuit breaker, which will be confirmed by a revision technician or directly by the electricity distributor.

This particular BOSCH model has an output of 12 kW - as a rough guide, this corresponds to an electric current considerably higher (with a three-phase connection) than you would expect from a typical household appliance, so it is necessary to check the capacity of the house circuit breaker and connection in advance.

• Is an electric boiler worth it compared to a gas or solid-fuel boiler? An electric boiler has the lowest purchase price and the simplest installation (no flue gas extraction is needed, since it burns nothing), but operating costs for electricity are usually higher than for gas or wood/coal for the same amount of heat delivered. It is particularly suitable where gas is not available, as a supplementary/backup source, or for a building with low consumption (well-insulated new builds, cottages, flats).
• How does an electric boiler regulate output? Most models switch individual heating elements on/off gradually (in stages); some more modern models also allow smoother output modulation - this affects the smoothness of heating and, to some extent, the service life of the switching components.
• Can I install this electric boiler myself? Connection to the electrical network, inspection and commissioning must be carried out by a person with electrotechnical qualification in accordance with the applicable standard STN 33 2000 and related regulations - DIY installation is not permitted, either for warranty or safety reasons.
• Can this electric boiler also heat domestic hot water? For many models, yes, usually in combination with a separate domestic hot water tank and a switching (3-way) valve, which switches between the heating circuit and heating the tank - the exact possibility and required accessories for this particular model can be found in the technical parameters above, or consult our customer service.