for the user and the qualiﬁed installer
The MTH hydraulically controlled open (non pressure-type) small-instantaneos water heater is designed to
heat water for one draw off point. When the draw-off ﬁtting is opened, the heating capacity switches on
automatically and the water is heated. The hot water output is dependent on the cold water temperature, the
heating capacity, and the ﬂow rate.
The most important points in brief
Temperature adjustment is effected using the ﬁtting:
– To increase the temperature, restrict the ﬂow rate a little.
– For low temperatures, increase the ﬂow rate or mix in cold water.
Hot water output
* The built-in automatic ﬂow regulation provides a constant ﬂow rate. Temperature increase of about 25 K.
In the case of temperature selection, water temperatures of over 60 °C can be reached at the hot water
outlet. Small children should therefore be kept away from the hot water outlets.
Danger of scalding!
If the water feed of the MTH has been interrupted - e.g. because of the danger of frost or work on the
water pipe, the following steps must be taken before the unit is brought back into operation:
1. Remove or switch off fuses.
2. Open a tap downstream of the unit until the unit and the cold water feed pipe are free of air.
3. Replace or switch on fuses again.
The small-instantaneous water heater must not be connected to any pressure. Never close off the ﬁtting out-
let and do not use an aerator or a hose with a jet regulator. Furring can close off the outlet and thus cause
the small-instantaneous water heater to be under pressure.
It is important that only the enclosed jet regulator is used.
Maintenance and care
Maintenance work, such as for example checking the electrical safety, may only be carried out by a quali-
A damp cloth is sufﬁcient for care of the unit. Do not use any abrasive or corrosive cleaning agents.
Please de-scale or replace the enclosed jet regulator „SR" regularly:
MTH 350 / MTH 440: SR 3 Order.-No. 289591
MTH 570: SR 5 Order.-No. 270582
Scale built up (furring) can close off the outlet and impair (or even destroy) the appliance.
First actions to be taken in the event of malfunction
... First actions to be taken in the event of malfunction „Please look up: „3. Fault ﬁnding by the user"
In the event of maintenance and possibly repair work please inform the qualiﬁed installer of the data on the
identiﬁcation plate (
MTH . . .
. . . . . . . .
Operating and installation instructions
Keep these instructions carefully and pass them on to your successor in the event of a change in ownership,
in the event of maintenance and possible repair work they should be passed to the qualiﬁed installer for his
Output by 230 V
hot water output*
. . . . . .