Return Temperature; Accumulator Tank - Baxi Bioflo Installation & Servicing Instructions Manual

For the Installer
Circulation pump :
(installed as standard in BAXI Bioflo)
The circulation pump shaft is lubricated by water, therefore the pump is never allowed to run without water.
Model: HUP 15–4.0 U
Installation dimension: 130 mm
Diagram 1 Pump characteristic curve
2.5.3 Domestic water (hot water tank)
If BAXI Bioflo is used for loading a hot water tank, a gravity brake must be installed in the heating return. This
is provided as standard with BAXI Bioflo.

2.5.4 Return temperature

The return flow temperature increase installed as standard means that BAXI Bioflo can be operated with a return
temperature down to min. 20 °C. No external return flow temperature increase is required.

2.5.5 Accumulator tank

In principle a pellet boiler system does not need a buffer tank. A guaranteed minimum heat consumption is
required, e.g. fit a consumer circuit that cannot be blocked off or do not fit thermostat valves on all radiators.
Exceptions:
If the total heating requirements of the building according to the EN 12831 calculation are less than 50 % of the
boiler's nominal output, we would recommend integrating a buffer tank in the system. This means that the BAXI
Bioflo loads the buffer tank with a return hold-up group.
Boiler installation criteria:
– controlled residential area ventilation is an advantage if the boiler is being installed in a small space or if
building heat loads are low
– the room temperature in the installation room is too high
– BAXI Bioflo operating times are set by the system control
16