12
GB
MH 3..7, MDH 3..7
12
• Installation, commissioning and maintenance of this appliance may only be undertaken by an authorized
technician who will then be responsible for adherence to the applicable standards and installation regula-
tions.
• The appliance may only be used when correctly installed and in perfect working order!
• The appliance must be installed in a frost-free room!
• The appliance must be completely filled with water before being switched on!
• The appliance and its wiring and piping must not be modified in any way!
• The front cover of the appliance must never be opened before disconnecting the appliance from the
mains power supply!
• Be careful! When the appliance has been in use for some time, the fittings may be very hot!
• The appliance must be earthed at all times!
Safety notes:
This small instantaneous water heater shall supply a single outlet and shall only be used for heating drinking
water with a specific water resistance of ≥ 800 Ω cm at 15 °C.
Types MH 3..7 may be used only with
special safety taps (open outlet)!
Use for any other purpose is not permitted. When the hot water tap is
open, the heater switches on automatically and heats the water as it passes through the appliance. The hot
water temperature depends on the flow rate (see diagram, fig.3). For this reason:
• slightly close the tap for higher temperatures or
• mix with cold water for lower temperatures.
Varying inlet temperatures and available pressure may affect the outlet temperature. In winter, when the
incoming water is cold, the desired outlet temperature can often be achieved only by reducing the flow rate.
If the flow rate or the water pressure is too low, or if the hot water tap is closed, the heater switches off
automatically. For a satisfactory water output, the enclosed special jet regulator and/or hand shower shall
be used.
Intended use, operation
