Ariston TOP WIFI, Manual

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Hybrid electric water heater – SAFETY WARNINGS
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must be made to operate frequently in order to check that it is not blocked
and to remove any limescale. In countries which acknowledge EN 1487,
the appliance's water intake pipe must be equipped with a safety device
compliant with said standard; it must be calibrated to a maximum pressure
of 0.7 MPa, including at least a cock, check valve, safety valve and
hydraulic load cut-out.
14. It is normal that water drips from the overpressure safety device or from the
EN 1487 safety unit when the appliance is heating. For this reason one
must install a drain, open to the air, with a continuously downwards sloping
pipe, in an area not subject to subzero temperatures. A condensate drain
should also be connected to the same pipe with a special coupling.
15. The appliance must be drained if left inactive in a room subject to frost
and/or in the event of prolonged inactivity. Drain as described in the
appropriate chapter.
16. Water heated to over 50°C can cause immediate serious burns if delivered
directly to the taps. Children, disabled persons and the aged are particularly
at risk. We recommend installing a thermostatic mixer valve on the water
delivery line, identified by a red ring.
17. Do not leave flammable materials in contact with or in the vicinity of the
appliance.