Boiler design
Fleece insulation X
Up to 38 per cent less storage loss as compared to soft foam insulation thanks to the energy-saving and environmentally friendly 100 mm fleece insulation.
Indicating thermometer X
3 indicator thermometers allow easy reading of the heat storage temperatures at the top, centre and bottom.
Solar-powered indirect coil heater X
Simple, cost-effective and efficient solar integration through two coils at the top and bottom.
6/4” Connection X
Very little space required and suitable for niches due to the connections arranged at the front.
Fresh water module FRIWA32 X
Space-saving because of compact design and direct installation on AccuWIN Solar.
Hooked strip X
Simple and quick installation and also sleek visual appearance due to the simultaneous function of a cable duct.
Raised or deep-drawn connection pipes X
Best energy utilisation by extracting the heating water at the highest temperature level (top) and also loading the lower range that is not normally used.
Cogent to the smallest detail
- Up to 38 per cent less storage loss as compared to soft foam insulation thanks to the energy-saving and environmentally friendly 100 mm fleece insulation.
- 3 indicator thermometers allow easy reading of the heat storage temperatures at the top, centre and bottom.
- Simple, cost-effective and efficient solar integration through two coils at the top and bottom.
- Very little space required and suitable for niches due to the connections arranged at the front.
- Space-saving because of compact design and direct installation on AccuWIN Solar.
- Simple and quick installation and also sleek visual appearance due to the simultaneous function of a cable duct.
- Best energy utilisation by extracting the heating water at the highest temperature level (top) and also loading the lower range that is not normally used.
The advantages at a glance
+ Integration of the solar heating system through two high-performance smooth-tube indirect coil heaters
+ Saves space thanks to direct mounting of a drinking water module
+ High-quality, environmentally friendly 100 mm ECO SKIN fleece insulation
Can be combined flexibly
Depending on the requirements, different storage sizes and types can be combined to form a cascade. And of course, a coil heating tank or a drinking water module can be easily combined to treat the domestic hot water.
AccuWIN Solar
Unique, patented cascading
The efficient combined concept patented by Windhager for heat accumulators ensures extremely good use of energy. Thanks to special connection technology, the second accumulator can be loaded without auxiliary energy.
Discharging the heat storage cascade
1/ Loading cascade accumulator
The first cascade accumulator is loaded using the accumulator load control system and hydraulic arrangement. Since only a little water needs to be heated, the energy can be extracted quickly. This also helps to reduce radiation losses.
2/ Loading second accumulator
If the temperature near the middle connection line reaches 45 °C, a valve opens and the second accumulator is loaded without auxiliary energy thanks to the thermal lift. At the same time, the bottom part of the first accumulator remains free, for example for energy from the solar heating system.
3/ Both accumulators have been heated through
Once sufficient energy is supplied, both accumulators are completely heated through.
Loading the heat storage cascade
1/ Unloading first accumulator
When heat is needed, it is discharged from the first accumulator tank. This means that space is made available again in the lower area for the addition of new solar energy. The temperature is ideally stratified in both accumulators because the bottom connection is used for the return. So the second heat accumulator remains warm in the upper part.
2/ Unloading second accumulator
If the temperature in the first heat accumulator falls below that in the second, the heat is moved from the second to the first accumulator using a pump. The ideal heat stratification is therefore retained and all the stored energy can be used.
Technical data
The AccuWIN Solar is available in a total of two different forms.
| Type | AccuWIN Solar 825 | AccuWIN Solar 1000 | |
| Nominal content | l | 825 | 1,000 |
| Diameter with/without insulation | mm | 990/790 | 990/790 |
| Height with/without insulation | mm | 1,940/1860 | 2,135/2050 |
| Overall height without insulation | mm | 1,905 | 2,090 |
| Minimum room height | mm | 1,960 | 2,190 |
| Weight with/without insulation | kg | 160/150 | 170/160 |
| Supply/return connections | Int. thr./Ext. thr. | 6/4" int. thread | 6/4" int. thread |
| Connection ports | Int. thr./Ext. thr. | 6/4" int. thread | 6/4" int. thread |
| Indirect coil heater connections | Int. thr./Ext. thr. | 1" int. thread | 1" int. thread |
| Surface area of solar-powered indirect coil heater bottom/top | m2 | 2.4/1.1 | 3/1.3 |
| Nominal content of solar-powered indirect coil heater bottom/top | l | 15/7 | 19/8 |
| Max. permitted operating pressure of heating system | bar | 3 | 3 |
| Max. perm. operating pressure of solar-powered indirect coil heater | bar | 10 | 10 |