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Item no. 17850, 17851, 17852, 17853, 17857, 17858
SVB price: €415.92
You save: 16%
Excl. VAT, excl. shipping costs.
This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
9 left in stock
Item no.
Model no.
Operating voltage
230 V
Heating Coil
Zulauf (Kaltwasser)
Ablauf (Warmwasser)
Zulauf (Motorkühlung)
Ablauf (Motorkühlung)
inkl. Mischventil
Not specified
Not specified
43 cm
36.6 cm
35.8 cm
7 kg
B0 20 UC

Product details

The COMPACT series from SIGMAR marine offers innovative water heaters of 20 to 60 liters, developed specifically for use in recreational boating. The solid 1.5 mm thick stainless steel tank is argon gas-shielded welded. Due to their design, COMPACT boilers are particularly suitable for installation on flat surfaces/ bulkheads. They feature a thermostat and a safety/check valve. The water heater uses the excess heat produced by the engine cooling circuit, shore power supply or energy from a generator. Using excess heat is very economical: water is permanently heated and the excellent insulation of the boiler keeps it hot for a long time. Each boiler has an integrated safety valve which opens for protection from a pressure of 4 bar (58 psi). The hoses can be connected via ½" fittings/nozzles (the connection nozzles are not included).

Tip: The COMPACT heaters are also available with a second heat exchanger - so in addition to excess cooing water engine heat, an existing water heating system can also be used to pre-heat the water and maximise the energy used by the engine. Heaters with a second heat exchanger have an additional thermostat to control a hot water heating system.

Choose a boiler with a second heat exchanger

  • if you plan to utilise waste heat from more than one engine,
  • or to install an auxiliary burner to heat the water when the engine is not running.
  • B0 20 UC: 800W
  • B0 22 UC: 800W
  • B0 30 UC: 800W
  • B0 40 UC: 800W
  • B0 40 UCD: 1200W
  • B0 60 UXD: 800W


it-flag Brochure
.PDF, 5,21 MB
multi-flag Drawing
.PDF, 212,86 KB
Item no.: 17858
multi-flag Drawing
.PDF, 110,33 KB
Item no.: 17857
multi-flag Manual
.PDF, 2,98 MB

What other SVB customers have to say

100% real reviews
Bart D.
by Bart D. Flag of Belgium 3/1/2021 Verified purchase Variant: 17852
Boiler replacement for Beneteau 473
Replaced the quick 43 litres boiler with this 30 liter model.
It was easier to mount the new one then to remove the old one.

I miss some connection parts like 12" tube couplings to connect to the engine and 12" F-F couplings to connect the hot and cold water tubes.
I also recommend to order the mixing valve to keep the temperature under control when the water is heated by the engine.
Leo K.
by Leo K. Flag of Finland 4/5/2020 Verified purchase Variant: 17850
Umpirosteria, putkiteippiä pitää käyttää liitoksissa. Erittäin laadukkaan tuntuinen laite. Olen tyytyväinen. S.
by S. Flag of Lithuania 10/26/2017 Verified purchase Variant: 17858
Personal thanks Jasmin Schröder!
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Customers ask customers

Ask other SVB customers who have already purchased this product from us about their experience.

Your question will be automatically forwarded to other SVB customers and published on the product page. Please do not ask any questions which can only be answered by the SVB team – such as the status of an order or product availability. You are also more than welcome to contact our SVB team by email at: or by phone on: +49 (0)421 57290510 .

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Technical question

User image of Marko R.
Marko R. asked
on Feb 20, 2020
Flag of English Bought this unit from SVB: SM40 double. I noticed two thin cables from thermostat, there is label on them, saying max current something. I cant find those two cables in manual? Is there additional manual/help somewhere?
User image of Cory V.
Cory V. answered
on Oct 7, 2022
Dear customer, please email in this case.
User image of Simon R.
Simon R. asked
on Sep 21, 2021
Flag of English Hi there, are these ignition protected ?
User image of Cory V.
Cory V. answered
on Oct 7, 2022
Dear customer, please email in this case.
User image of Michael M.
Michael M. asked
on Apr 5, 2022
Flag of English Hello.looking for information. on how to control the the temperature of the engine coolant going through the heat exchanger / coil on my Sigmar hot water heater..any help would be very much appreciated..thank you michael
User image of Cory V.
Cory V. answered
on Oct 7, 2022
Dear customer, please email in this case.

General question

User image of Don Ranjith S.
Don Ranjith S. asked
on Sep 9, 2020
Flag of English i want make payment online ii have a visa card please show payment link
User image of Cory V.
Cory V. answered
on Sep 16, 2020
Dear customer, please make your order directly through our webshop as prompted. Thanks.