SVB price: €1,025.17
You save: 20%
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.
10 in stock
Item no.
Model no.
Operating voltage
12 V, 24 V
Max. Kühlvolumen
100 l
Max. Gefriervolumen
35 l
Compressor Type
Cooling type
Air cooling
28 cm
16 cm
17.5 cm
14 kg

Product details

The Isotherm ITC+ systems are designed for installation in existing cool boxes. They are mainly intended for use on sailboats, where battery power is at a premium. The ITC+ system provides maximum cooling capacity with minimum battery drain.

It senses when surplus power is available from the engine alternator and speeds up the compressor to rapidly freeze the holding plate. When surplus power is no longer available it reduces its energy-use accordingly. The stainless steel holding plate can be fitted at any suitable angle high up in the box before being connected to the compressor unit by the 3 meter long 6 mm diameter flexible copper piping fitted with quick-couplings. The compressor unit is small enough to be fitted in a stowage compartment or any other unused space within connecting distance from the holding plate. After connecting the leads to the battery, the prefilled system is ready to go.

Third refrigeration compressor generation with refined ITC+ system. The new Danfoss compressor is not only more compact, but also considerably lighter and more effective. In a system without ASU, the energy saving compared to older compressor types is up to 20 %. With ITC+ and other enhancements, energy consumption has been reduced by up to 50% compared to previous models. The compressor runs so quietly that we have now integrated a separate speed control for the fan, as this was more audible than the compressor. The new ITC+ system regulates the compressor and fan to the lowest possible speed when running on battery power alone.

The ITC+ system is controlled by means of a special control panel. When switched to NORMAL/AUTO, this unique system operates in fully automatic mode, maintaining the correct temperature at the lowest battery load. When battery power is not being used - for example when connected to shore power or a solar panel - MAN TEMP mode can be selected and the temperature set manually using the knob on the control panel. 12/24 Volt.

The practical "click-on" bracket for horizontal and vertical mounting is included (except for the units ASU 4201 and 4701).

Note: For water connection, we recommend replacing the existing through-hull with the one supplied. If there is no through-hull on board, a 1 1/4" ball valve, a nozzle and a hose are required for the connection. These components are not included in the delivery.

Technical data

ITC+ 3201: 14 kg, cold storage dimensions (LxWxH): 300 x 210 x 60 mm, compressor size (LxWxH):280 x 160 x 175 mm, air-cooled, freezer volume: max. 35 l
ITC+ 3701: 16 kg, cold storage dimensions (LxWxH): 355 x 280 x 60 mm, compressor size (LxWxH): 330 x 160 x 175 mm, air-cooled, freezer volume: max. 50 l
ITC+ 3251: 14 kg, cold storage dimensions (LxWxH): 300 x 210 x 60 mm, compressor size (LxWxH):280 x 160 x 175 mm, seawater-cooled, freezer volume: max. 35 l
ITC+ 3751: 18 kg, cold storage dimensions (LxWxH): 355 x 280 x 60 mm, compressor size (LxWxH):420 x 240 x 200 mm, seawater-cooled, freezer volume: max. 50 l
ITC+ 4201: 19 kg, cold storage dimensions (LxWxH): 355 x 280 x 60 mm, compressor size (LxWxH):420 x 240 x 200 mm, seawater-cooled, freezer volume: max. 50 l

What other SVB customers have to say

100% real reviews

16 customer reviews

4.5 (out of 16 ratings)
3 Stars
1 Stars
Rajko Š.
by Rajko Š. Flag of Slovenia 6/19/2023 Verified purchase Variant: 44530
Very, very good! It realy works in all regimes, in die marina, with pfotovoltaics and with motor - optimal for my sailboat !
Pedro P.
by Pedro P. Flag of Portugal 7/16/2021 Verified purchase Variant: 44530
This was to substitute a former ASU 3201 now - 30 years old that finally gave its soul. I wonder how can this new one be so much better. The first time I started it one can of coca-cola was frozen like a stone and blew. I had to moderate the beast.
It is also absolutely silent, which did not happen to the old one.
I absolutely recommend it to a sailboat which keeps sailing most of the time.
Ray L.
by Ray L. Flag of Greece 8/17/2015 Verified purchase Variant: 44530
Superb service yet again, the well packed goods arrived in Greece within seven days which is amazing for here, it\'s early day\'s but the Isotherm asu seems to be a big improvement on my old refrigeration system using less power plus it is also extremely quiet, so far i\'m very pleased.
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Customers ask customers

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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 Maarten O.
Maarten O. asked
on Mar 21, 2023
Flag of English Dear sir, Is the Isotherm ITC+ 3201/3701 compatible with a lithium based electrical system? Specifically, will the eco-mode of the controller work? The manual states that the controller switches to eco-mode when it detects a voltage below 12.7V. However, a 12V lithium system works on a slightly higher voltage than a Lead Acid system. With a SOC bottom of 80% the voltage will never go below approximately 13.4V. Kind regards, Maarten
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User image of Niels R.
Niels R. asked
on Sep 27, 2023
Flag of English I have fridge and freezer in two separate compartments. Both are already fitted with holding plates. Can I buy this kit without the holding plate? What is the maximum size holding plate the unit can be connected to? Does SVB have similar units for sale for larger holding plates?
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General question

User image of Timo M.
Timo M. asked
on Feb 18, 2021
Flag of English ASU 4701: 23 kg Dimension cold storage (LxWxH): 355 x 280 x 90 mm​​, compressor size (LxWxH): 390 x 200 x 175 mm, seawater cooled, frozen Volume: max.80 l Documents I have Isotherm ASU 4701 at specification, but no price or possible to order. Please clarify. Timo
User image of Cory V.
Cory V. answered
on Feb 19, 2021
Dear customer, please email for an offer.
User image of RPA B.
RPA B. asked
on Aug 18, 2021
Flag of English Hallo. Is the unit with ITC control module. Greets
User image of Viljar T.
Viljar T. answered
on Aug 18, 2021
Yes, for me it shipped with ITC control module (without red ASU module)