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For the qualified installer
2.6 Regulations and provisions
• Installation (water and electrical installation), as well as the first start-up and maintenance of this
unit, may only be carried out by a qualified installer in accordance with these instructions.
• Faultless operation and operational safety are only guaranteed if the original accessories and spare
parts intended for the unit are used.
• In accordance with IEE and WRC Regulations.
• Regulations of the local energy supply company.
• Regulations of the relevant water supply company.
The following should also be observed:
• The unit rating plate.
• Technical data (see Table 1).
The specific electrical resistance of the water must not be lower than specified on the rating
plate. In the case of a water grid supply network, the lowest electrical resistance of the water is
to be taken into account (see Table 2). Your water supply company will advise you of the
specific electrical resistance or the electrical conductivity of the water.
Water installation:
• A safety valve is not necessary.
• Operating the unit with preheated water is not permitted!
• Fittings for pressurised units are not permitted!
Electrical installation:
• It must be possible to isolate the unit from the main supply on all poles with an isolating distance of
at least 3 mm, for example using fuses.
2.7 Technical data (the data on the unit identification plate are applicable)
Table 1
Type MTH 350
Rated power 3.5 kW
Rated voltage 230 V ~
Rated current 15 A
Hot water output ∆ϑ = 25 K 2.0 l/min
Flow rate „on“ ≤ 2.0 l/min
Flow rate „off“ ≥ 0.9 l/min
Automatic flow regulation 2.2 l/min
Pressure drop (during switch-on flow) 0.05 MPa
Max. inlet temperature 25 °C
Rated capacity 0.1 l
Design open
Weight 1.4 kg
Protection class in accordance with EN 60335 1
Protection mode in accordance with EN 60529 IP 25
Test mark See unit identification plate
Structural inspection test certificate PA-No. (Nr. for Germany)
Water connections (external thread) G 3/8, surface installation
Electrical connection 1/N/PE ~ 230 V
Heating system Bare-wire
Area of use Low-lime and limy water
Range of use with regard to specific
electrical resistance / conductivity See Table 2
MTH 350 DE_GB.p65 14.04.2004, 10:4514
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