FRIWA 31

Well-designed to the smallest detail

Plate heat exchanger

Copper-soldered plate heat exchanger for optimum transmission values.

Thermostat head

If required, the thermostat head can be used to set the hot water temperature desired.

Feed pump (primary side)

Removes the hot heating water from the buffer tank and transports the cold return back to the tank.

Electrical box

There is space for all the electrical connections needed in the splash-protected electrical box.

Water switch

When hot water is drawn off, this is activated and switches on the feed pump to heat domestic water.

Push-in connection for circulation unit

Simple connection option for an optional circulation pump.

FRIWA 31

Method of operation

Thanks to patented temperature control, the fresh water unit guarantees permanently fresh and hot water of the required volume at a constant temperature, without waiting.

Functional description

If a tap is opened in the house, the water switch activates the feed pump. This transports the hot buffer tank water to the heat exchanger where the cold water is heated to the set hot water temperature. Mixing via the mixer circuit ensures that the hot water exits the system at a constant temperature. This setup also ensures that only as much hot water is removed from the buffer tank as is needed and that the return to the buffer tank is as cold as possible.

Once the amount of hot water needed is covered (tap is closed again), the feed pump is switched off again. Hot water is therefore provided to suit demand and any losses resulting from down-time of a hot water storage tank or the formation of legionella bacteria in the tank are not possible.