STIEBEL ELTRON ETS 300

Need help?

Do you have a question about the STIEBEL ELTRON ETS 300 and is the answer not in the manual?

Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document provides comprehensive information for the operation, installation, and maintenance of Stiebel Eltron ETS 200-700 series storage heaters. The manual is available in multiple languages, including German, English, French, Dutch, Czech, and Polish.

Function Description

The ETS series appliances are electric storage heaters designed to heat living areas. They operate by storing electrically generated heat, primarily during off-peak hours when electricity is cheaper, as enabled by the power supply utility. The stored heat is then released into the room as hot air via a fan, and partially through the appliance's surface, to maintain a desired room temperature.

The heat storage (charge) level is set via a charge controller. The appliance can be used with or without a central weather-compensated charge control system. For appliances without a weather-compensated system, the "charge controller" rotary selector is adjusted based on seasonal needs (e.g., Stage 0 for no charge, Stage 1 for approx. 1/3 charge in between seasons, Stage 2 for approx. 2/3 charge on mild winter days, and Stage 3 for full charge on winter days). For appliances with a weather-compensated system, the "charge control" rotary selector is typically set to Stage 3, and the system ensures the correct charge level.

Heat transfer (discharge) is regulated by a room temperature controller, which can be wall-mounted or integrated into the appliance. This controller automatically manages the fan to maintain the adjusted room temperature. On extremely cold days or when away for several days, it is advisable to set a reduced room temperature (e.g., 10 °C) for frost protection rather than switching off the controller.

The storage blocks inside the heater are heated by elements positioned between them. The charge level can be infinitely adjusted, and the start and duration of the charge time are determined by the local power supply utility. Two integral protective temperature controllers and a high-limit safety cut-out prevent overheating. The protective temperature controllers reset automatically, while the high-limit safety cut-out requires manual resetting after the fault cause is addressed.

Room air is drawn in by the fan through the air inlet grille, heated by passing through ducts in the storage blocks, and then released as hot air. Before release, the hot air is mixed with cooler indoor air via two mixing air dampers to ensure the expelled air does not exceed the highest permissible temperature. The mixing ratio is regulated by a bi-metal controller.

Important Technical Specifications

The ETS series includes models ETS 200, ETS 300, ETS 400, ETS 500, ETS 600, and ETS 700.

Electrical Data:

Connected Load: Ranges from 2000 W (ETS 200) to 7000 W (ETS 700).
Rated Voltage: 400 V for all models.
Phases: 3/N/PE for all models.
Frequency: 50 Hz for all models.
Rated Heat-up: Ranges from 16 kWh (ETS 200) to 56 kWh (ETS 700).
Max. Charge: Ranges from 17 kW (ETS 200) to 61.5 kW (ETS 700).
Electric Booster Heater: Ranges from 0.35 kW (ETS 200) to 1.5 kW (ETS 700).

Dimensions:

Height: 650 mm for all models.
Width: Ranges from 605 mm (ETS 200) to 1480 mm (ETS 700).
Depth: 275 mm for all models.
Feet Clearance: Ranges from 415 mm (ETS 200) to 1290 mm (ETS 700).

Weights:

Weight (appliance only): Ranges from 32 kg (ETS 200) to 72 kg (ETS 700).
Weight (incl. blocks): Ranges from 116 kg (ETS 200) to 366 kg (ETS 700).

Other Values:

Four-stage charge level reduction: 100/90/80/70 for all models.
Heat retention capability: Ranges from 48% (ETS 200) to 59% (ETS 700).
Operating noise: Ranges from 30 dB(A) (ETS 200) to 34 dB(A) (ETS 700).
Number of stone packs: Ranges from 6 (ETS 200) to 21 (ETS 700).

The connected load can be reduced in three output stages by moving or removing jumpers at the terminals, in conjunction with a charge level reduction at the charge controller. The appliance is factory-wired for maximum output (100%).

Usage Features

User Interface: The appliance features a user interface with rotary selectors for charge control (heat storage) and discharge control (heat transfer/room temperature), along with ON/OFF switches for the discharge controller and an optional booster heater. The user interface cover can be flipped open for operation.

Safety:

Only permanent connection to the power supply is allowed, with an isolator that disconnects all poles with at least 3 mm contact separation.
The appliance must be installed by a qualified contractor.
Children under 3 should be kept away unless constantly supervised. Children aged 3-7 may operate the appliance under supervision and after instruction on safe use. Children aged 8 and older, and persons with reduced capabilities, may use the appliance if supervised and instructed.
Never cover the appliance.
Do not install directly below a wall socket.
Ensure control equipment cannot be touched by a person in the bath or shower.
Avoid operating in rooms with fire/explosion risk from chemicals, dust, gases, or flammable materials.
Surfaces and expelled air can become hot (above 80 °C), so caution is advised, especially with children or vulnerable persons.

Charge Controller Fault Characteristics: The factory setting is "positive fault characteristics (80% PS)," meaning the appliance fully charges if the charge control system is faulty. For digital charge control systems, this can be changed to "negative fault characteristics" (storage heater not charged) by replugging jumper X16 to "80% NS."

Control Signals: The electronic charge controller can be connected to different control unit control signals (AC or DC) and integrated into existing systems.

Maintenance Features

Cleaning:

The appliance casing should be wiped with a damp cloth and hot water with washing-up liquid if brownish discolouration appears.
Clean the appliance when cold using ordinary cleaning products.
Avoid abrasive or corrosive cleaning products and never spray cleaning spray into the air slot.
The fluff filter in the air inlet grille must be cleaned regularly to ensure trouble-free discharge. If a fluff filter is added, the fan should be switched OFF during cleaning.

Regular Checks:

The fan duct behind the air outlet grille should be checked every two years for dirt deposits.
Control components, safety components, and the entire charge and discharge control system should be checked at least within the first ten years after commissioning.

Troubleshooting: The manual includes a status display for the charge controller (LED indicators for no fault, charging fault, or discharge fault) and a detailed fault table with common problems, causes, and remedies. For example, if the appliance does not heat up, potential causes include a faulty heating element contactor control, no power supply, or a tripped high-limit safety cut-out (F1). The high-limit safety cut-out can be manually reset.

Replacing a Fuse: The electronic charge controller is protected by a replaceable fine fuse (5x20 mm 2A slow) located in a two-part fuse holder between mains terminals X1 and X2. The appliance must be isolated from the power supply before changing the fuse.

Recommissioning: When reinstalling or modifying an appliance, thermal insulation parts should be replaced if damaged, insulation checked, and rated consumption measured. The appliance should then be started according to the commissioning chapter.