Heat production

S735 is supplied with a heating control system, which means that the heating supply to the house takes place according to selected settings. When connecting to a system with thermostats on all radiators (or underfloor heating coils), either a bypass valve must be fitted or some of the thermostats must be removed to ensure there is sufficient flow. For more information about heat production, see the Installer Manual.

Hot water production

S735 consists of a storage heater that is heated with a charge coil.

When there is demand for hot water, S735 prioritises this and switches to hot water mode. There is no heat production in this mode.

For more information about hot water production, see the manual for S735.

Heating system 2

This function requires the ECS 40/41 accessory. Shunt valve, supply and return line sensors, as well as circulation pump, are connected to other heating circuits with a lower temperature demand (e.g. underfloor heating system). The temperature in the extra heating system follows the selected curve slope and offset setting. Up to 8 extra heating systems can be connected to the installation.

For further information, see the Installer Manual for the accessory.

See the valve’s manual for a port description.

External heating medium pump

With the AXC 20 accessory, an external heating medium pump can be connected to S735, if the alarm relay (the AUX output) is activated for another function.

Extra hot water heaters

The system should be supplemented with an extra water heater, if a large bath tub or other significant consumer of hot water is installed.

Docking kit DEW S42

In houses with a large hot water demand, VPB S200 can be docked to NIBE S735. Docking kit DEW S42 is required.

For further information, see the Installer Manual for the accessory.

Docking kit DEW S43

In houses with a large hot water demand, AHPH S eller AHPS S can be docked to NIBE S735. Docking kit DEW S43 is required.

Together with AHPS S, the accessory can also be used when docking with an external heat source, such as a water jacketed stove or a thermal solar installation.

For further information, see the Installer Manual for the accessory.

Solar panels

This function requires the NIBE PV accessory. NIBE PV is a complete modular system with solar panels in several basic outputs. NIBE PV is connected to S735, which adjusts to the generated solar electricity produced.

For further information, see the Installer Manual for the accessory.

Supply air module

NIBE SAM S42/S44 is a supply air module specially designed to combine recovery of mechanical exhaust air with preheated supply air together with the exhaust air pump NIBE S735.

The integrated fan in NIBE SAM S42/S44 takes the exhaust air and blows it out into the house via the supply air inlet. The supply air is warmed as needed.

For further information, see the Installer Manual for the accessory.

Hot water circulation

A circulation pump can be controlled by S735 to circulate the hot water. The circulating water must have a temperature that prevents bacterial growth and scalding, and national standards must be satisfied. See the appropriate Installer Manual for more information.