Marine heating system Installation Instructions
32 © Webasto Global Comfort Solutions
®
10.3.2.2 Minimum pipe diameter
The pipe diameter of the main pipe depends on the diameter of the heating system water
connection.
Thermo Top C
®
20 mm
Thermo 90 ST
®
20 mm
DBW 2010/2016
®
20 mm
Thermo 230/300/350
®
38 mm
Pipe diameter in side branches: keep at least to the connection diameter of the heat exchangers
(heating elements, blower heat exchanger, convectors).
10.3.3 Circulation pump
For particularly large ships (depending on length/diameter of the pipelines), a larger circulation
pump is necessary. Ask a specialist for an estimate.
To avoid sound conductance as much as possible, fit rubber grommets.
10.3.4 Water volumes and additives
Heater unit recommended water volumes Minimum water volumes
Thermo Top C
®
8 l 4 l
Thermo 90ST
®
12 l 6 l
DBW 2010/2016
®
20 l 10 l
Thermo 230/300/350
®
30 l 30 l
Keep to the recommended water volumes as much as possible. If necessary, use buffer storage in
the circuit to increase the volume. Add branded anti-freeze as a corrosion and freezing protection
according to the manufacturer’s instructions.
10.3.5 Water system – open or closed
Water circulation: Open and closed system versions are available.
Closed: less sensitive to corrosion, if carefully bled. Guide: per 1 KW of heating capacity, approx. 1
liter water content in pressure expansion vessel. Safety valve required (P > 2.0 bar). Heater and
expansion vessel can be lower than the heating elements.
Open: Header tank with safety valve (P > 1.0 bar) in circuit for absorbing expanding water volume.
Guide: per 10 l water content, approx. 1 l compensation vessel. Compensation vessel: install at the
highest point in the circuit.
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