Description
Electric storage heating · 7–8-hour charging window · 750 W boost heater
Charge a large heat store within a shorter tariff window
TECHNOTHERM TTB-E 7 Duo 34+ is a high-capacity, fan-assisted electric storage heater for regularly used living and working spaces. Four 850 W storage elements charge eight brick packs at a total input of 3.40 kW. A complete nominal charge stores 27.2 kWh of heat, which the appliance then releases according to room demand. A separate 750 W boost heater provides additional immediate heat when required.
The 7 Duo version is designed for projects where the available low-price tariff, controlled supply or photovoltaic charging period is concentrated into approximately 7–8 hours. It stores the same nominal amount of heat as the corresponding 14 Duo 34+ model, but uses a higher charging input to complete the charge in roughly half the time. The building supply and control strategy must therefore be designed for the 3.40 kW storage load.
How it works
Electricity is stored as heat and released under electronic control
During the enabled charging period, the storage elements heat the dense ceramic core. The electronic thermostat monitors room temperature, charge level and the active schedule, while adaptive control determines how much heat should be prepared for the next occupied period. The warm cabinet provides radiant heat and a built-in ultra-quiet fan assists controlled distribution into the room. The current catalogue states approximately 10 dB for the fan.
Manual, weekly programme, boost and off modes are available from the TFT control panel. Open-window detection reacts to a rapid temperature drop so heat output is not continued unnecessarily during ventilation. The current catalogue also specifies internet and app access; the required interface and exact project configuration are confirmed with the order.
Full charge in 7–8 hours
The 3.40 kW storage input is intended for a compact off-peak, controlled-supply or planned solar charging window.
27.2 kWh nominal heat store
Eight brick packs retain a substantial amount of heat for later delivery instead of relying only on instant electrical heating.
Separate 750 W boost heater
Short-term comfort demand can be covered without waiting for the entire storage core to charge.
Adaptive weekly control
Room sensing, charge indication and programmable temperatures help align charging and heat release with actual occupancy.
Quiet mixed heat delivery
Radiant heat from the cabinet is combined with a very quiet fan that helps distribute warmth evenly through the room.
Slim 18.5 cm cabinet
The substantial storage core remains close to the wall, while top-mounted controls stay accessible.
Verified technical data
TTB-E 7 Duo 34+ specifications
The model identity and commercial dimensions below follow the supplier-delivered English TECHNOTHERM 2026/27 catalogue. Charging, safety and installation data were checked against the current manufacturer manual MAG-000007, edition 02/26. The manual uses a slightly different cabinet measurement and installed weight; for access and structural planning, use the larger envelope and design load shown below until the documentation supplied with the actual production unit is checked.
| Model | TTB-E 7 Duo 34+ |
|---|---|
| SKU / order number | 842534007 |
| Storage charging input | 3.40 kW (4 × 850 W) |
| Boost heater | 750 W |
| Charging window | approximately 7–8 hours |
| Nominal / maximum thermal charge | 27.2 / 30.9 kWh |
| Storage bricks | 8 packs |
| Indicative room area | up to approximately 26 m²; verify by heat-loss calculation |
| Current catalogue dimensions W × H × D | 1095 × 715 × 185 mm |
| Current catalogue weight | approximately 162 kg |
| Installation planning envelope | allow up to 1095 × 720 × 185 mm and 166 kg according to the current manual |
| Electrical supply | 230 V, 1/N/PE, 50 Hz; fixed connection |
| Protection class | Class I |
| Finish | white, similar to RAL 9003 |
| Control | TFT display, manual mode, weekly programme, adaptive charging, boost mode, open-window detection and app connection |
| Installation | floor-standing on feet with mandatory anti-tip wall fixing |
| Product-family safety standard | EN 60335 |
Choosing between 7 Duo and 14 Duo
Same storage size, different electrical load profile
Choose the 7 Duo 34+ when the building must complete charging in a shorter 7–8-hour window and the electrical installation can supply 3.40 kW to the storage elements. Choose the 14 Duo 34+ when the same nominal storage capacity should be charged more gradually over 14–16 hours at 1.92 kW. Neither version is automatically more economical: the correct choice depends on tariff availability, PV control, heat loss and available connection capacity.
Sizing and energy planning
Heat loss matters more than a simple floor-area figure
The manual’s approximate 26 m² figure is only an initial guide. WodaTherm™ checks room heat loss, insulation, target temperature, usable charging period, tariff or PV strategy and the available electrical supply before confirming the model. The storage heater should be treated as a controllable thermal load within the building energy plan.
Installation and delivery
Plan the floor, wall fixing, electrical connection and delivery route
The appliance stands on its feet; the rear fixing is required to prevent tipping and does not transfer the full heater weight to the wall. The floor must be flat and capable of carrying the installed load. The manual requires clear space around the heater, at least 50 cm in front of the warm-air outlet and suitable distances from window sills, curtains, furniture and combustible materials.
A qualified electrician must provide the fixed 230 V connection, protective conductor, all-pole isolation, circuit protection and charging-control wiring. The storage bricks are inserted during assembly, and the first charge must be supervised and checked by a qualified electrician. The heater must not be covered.
In stock. WodaTherm™ confirms unloading, carrying access and the delivery date with the order because the cabinet and brick packs are heavy. Electrical installation, building work, special internal carrying and external energy-management equipment are included only when expressly quoted.
Documentation
Installation and operating manual hosted by WodaTherm™
Download the TTB-E Duo installation and operating manual
The manual contains binding safety, mounting, wiring, clearance, first-charge, control and maintenance instructions. The documentation supplied with the actual production unit takes precedence for installation and commissioning.
