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ASU Systems

Isotherm ASU Systems (Automatic Start Up)

Indel Webasto Marine

Isotherm ASU Systems (Automatic Start Up)

The patented isotherm ASU system has now been available for several decades and has been installed on tens of thousands of boats worldwide.

The ASU system starts the compressor when the engine is running to freeze the holding plate completely.

The energy stored in the holding plate will keep the refrigerator cool for many hours.

When the engine is stopped, the compressor will not restart until the cold stored in the plate is completely consumed. Once the stored cold is consumed, the compressor starts to run for short periods in order to maintain the required temperature inside the cabinet.

Reference Max
fridge capacity
Compressor Current draw Compressor dimensions
(WxLxH) mm
Holdover plate
dimensions (WxLxH) mm
Average Max
IG200 125 BD35 0,4 A 5A 270x160x155 300x210x60 12
IG201 200 BD50 0,65 A 6,5 A 315x160x155 355x280x60 14
IG210 125 BD35 0,35 A 4,8 A 210x135x155 300x210x60 14
IG211 200 BD50 0,55 A 6A 210x135x155 355x280x60 16
IG220 / IG221 200/70 BD50 0,9 A 7,1 A 390x200x175 355x280x60 17
IG222 / IG223 240/85 BD50 1A 7,1 A 390x200x175 355x280x90 21
IG224 / IG225 325/105 2xBD50 1,4 A 10,3 A 475x225x175 400x320x90 28
IG227 / IG228 500/180 BD80 1,6 A 10,5 A 390x200x175 530x325x117 32
Pipe length: 3m (air cooled units and water cooled units w/ built-in pump); 1.5m (compressor/through hull coil exchanger); 3m (through hull coil exchanger/evaporator).
(1) Performances for a 12 V installation, a cabinet half the size of the maximum recommended, with appropriate insulation (ambient temperature: Air/Water: +22°C, cabinet temperature: +4°C). Voltage delivered to the compressor: 13.2 V minimum (running engine or charger).

Shipping and delivery

We are proud to offer international shipping services that currently operate in over 200 countries and islands worldwide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in Greece will be shipped by TNT, UPS, DHL and more depending on the weight and size of the product.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:

Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says "no information available at the moment".

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you have specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.

Refunds & returns policy

Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • You do not receive them within the guaranteed time (45 days not including 2-5 day processing)
  • You receive the wrong item
  • You do not want the product you have received (but you must return the item at your expense and the item must be unused)

We do not issue the refund if:

  • Your order does not arrive due to factors within your control (e.g. providing the wrong shipping address)
  • Your order does not arrive due to exceptional circumstances outside our control (e.g. not cleared by customs, delayed by a natural disaster)
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on page.

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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