Solar heat that remains available after the sun goes down

TECHNOTHERM TTB-E 14 Duo 34+ converts electricity into heat and stores it in a substantial fireclay core. With suitable energy management, charging can be scheduled for PV-surplus periods, off-peak tariffs or low dynamic prices. After electrical input stops, the core continues to release comfortable radiant and convective heat into the room.

Who should choose the 14-hour version?

The 14 Duo 34+ is designed for installations with a longer charging window. Its 1.92 kW storage input places a lower instantaneous load on the electrical supply than the 7-hour version. A separate 750 W direct heating element can provide a quick temperature boost outside the storage cycle.

Key benefits

• stores electricity in a durable fireclay core without a chemical battery,
• approximately 14–16 hour charging window,
• even radiant and convective heat after charging has stopped,
• separate 750 W direct boost for rapid temperature correction,
• electronic thermostat, time programmes and open-window detection,
• fixed-temperature, weekly programme, Boost and Off operating modes,
• Comfort, Eco and Frost Protection levels, adaptive start and keypad lock,
• internet and app control depending on system configuration,
• slim 18.5 cm body finished in white RAL 9003,
• made in Germany by TECHNOTHERM / LUCHT LHZ.

Technical data

Included

TTB-E 14 Duo 34+ heater, two floor feet, anti-tip mounting hardware and eight packs of fireclay storage blocks according to the supplier specification. The connection cable and any external PV-surplus control equipment are not included.

PV integration

The heater is a thermal store; it does not measure grid export by itself. Automatic PV-surplus charging requires compatible energy management, a suitably rated switching device and professional electrical installation. The appliance supports separate 24-hour control power and switched 8/14-hour charging power; the final circuit arrangement must be selected by the electrician for the installation.

Installation note: the appliance weighs approximately 162 kg. It must stand on a level load-bearing floor and be secured to the wall against tipping. The fireclay blocks are fitted on site. The manufacturer requires the first charge to be supervised by a qualified electrician. Heater sizing must be based on the building's calculated heat loss, not floor area alone.