Drazice
400-liter hygienic storage tank with insulation and 25-liter heat exchanger
400-liter hygienic storage tank with insulation and 25-liter heat exchanger
Delivery & collection by arrangement [usually within 5 working days]
Couldn't load pickup availability
400-liter hygienic storage tank with insulation & 25-liter heat exchanger
Intelligent heat storage for maximum energy efficiency: The Drazice NADO V11 hot water storage tanks combine two functions in one system – a buffer tank for heating water and hot water preparation with an integrated stainless steel tank. Perfect for combining multiple heat sources such as solid fuel boilers, heat pumps, solar thermal systems, and wood-burning stoves.
Your advantages at a glance
- Dual function: Buffer tank + hot water preparation in one unit
- Flexible application: Can be combined with solid fuel boilers, heat pumps, solar thermal systems, and more Fireplace
- Stainless steel inner tank: 20-25 liter rust-free tank for hygienic drinking water
- Optimal boiler operation: Stores excess heat with maximum efficiency
- High-quality insulation: 80 mm thick, removable thermal insulation
- 4 sizes available: 300L, 500L, 750L and 1000L for every need
Functionality & Applications
Buffer storage function
The NADO V11 hot water storage tank stores excess heat from your heating source – be it a solid fuel boiler, wood gasifier, heat pump or solar thermal system. This intelligent intermediate storage enables:
- Optimal boiler operation: The boiler always operates within the optimal temperature range with maximum efficiency
- Energy storage: Excess heat is stored instead of being wasted
- Longer combustion intervals: Less frequent refueling is required with solid fuel boilers
- Hydraulic separator: Optimal integration of different heating circuits
Domestic hot water preparation
The integrated 20-25 liter stainless steel tank enables direct domestic hot water heating or preheating:
- With solid fuel boiler: Direct heating to target temperature is possible
- With solar/heat pump: Preheating of the water, Reheating via electric heating element possible
- Stainless steel inner tank: Hygienically perfect drinking water quality
- Flexibly expandable: Combination with an additional hot water storage tank possible
Technical equipment
Construction & Construction
-
Main tank: Steel, exterior with protective coating
-
Inner tank: 20-25 liters stainless steel for drinking water
-
Tube heat exchanger: Integrated for optimal heat transfer
-
Insulation: 80 mm rigid polyurethane foam, removable for maintenance
-
Connections: 2x G1½" pipe connections for hot water preparation
-
Optional: Mounting for electric heating element TJ6/4"
Available Sizes
| Model | Buffer Tank Volume | Stainless Steel Inner Tank | Ideal for |
|---|---|---|---|
| NADO V11 300 | 300 Liters | 20 Liters | 2-4 Persons, Small Single-Family Homes |
| NADO V11 500 | 500 Liters | 25 Liters | 3-5 Persons, Single-Family Homes |
| NADO V11 750 | 750 liters | 25 liters | 4-6 people, large single-family homes | NADO V11 1000 | 1000 liters | 25 liters | Multi-family homes, commercial properties |
Typical application examples
1. Combination with solid fuel boiler Optimal solution for wood, pellet, or coal heating: Boiler operates in its optimal power range with maximum efficiency Excess heat is temporarily stored in the buffer tank Direct hot water preparation is possible in the stainless steel tank Less frequent refueling required Ideal for log boilers and wood gasifiers 2. Combination with a solar thermal system Maximum solar utilization through heat storage: Storage of solar heat for later use Preheating of domestic hot water in a stainless steel tank Re-heating via electric immersion heater or a second heat source Up to 60% energy savings in summer 3. Combination with a heat pump Efficient buffer storage for heat pumps: Reduces heat pump cycling Stores heat when electricity prices are low (Smart Grid) Domestic hot water preheating possible Optimized system hydraulics 4. Hybrid systems (multiple heat sources) Maximum flexibility through combination: For example: Solid fuel boiler + solar thermal system Or: Heat pump + wood-burning stove with water jacket Or: Pellet boiler + solar thermal system Intelligent use of all available energy sources Special advantages of solid fuel boilers The NADO V11 hot water storage tank is the ideal complement to solid fuel boilers (wood, pellets, coal): Optimal combustion: The boiler can run continuously at the ideal temperature and maximum efficiency Longer burn time: The stored heat bridges periods without active boiler operation Reduced emissions: Optimal combustion reduces pollutants minimized
Installation & Expansion Options
Electric Heating Element (Optional)
The NADO V11 can be retrofitted with a TJ 6/4" electric heating element:
- For additional domestic hot water heating
- Ideal for solar or heat pump combinations
- Independent hot water preparation in summer
- Easy retrofitting possible
Combination with external hot water storage tank
For higher hot water demand, the NADO can serve as a preheating stage:
- Preheating in the NADO stainless steel tank (20-25L)
- Postheating in a separate hot water storage tank
- Maximum energy efficiency through cascade use
- Particularly useful when Solar/Heat Pump Systems
General Technical Data
Available Volumes: 300L, 500L, 750L, 1000L Main Tank: Steel with protective coating (exterior), uncoated (interior) Inner Tank (Domestic Hot Water): 20-25L stainless steel Stainless steel Heat exchanger: Steel tubular heat exchanger Insulation: 80 mm rigid polyurethane foam, removable Domestic hot water connections: 2 x G1½" Optional: Electric heating element TJ 6/4" Max. operating pressure: 6 bar (buffer tank) Max. Temperature: 95°C Energy efficiency & cost savings
The NADO V11 hot water storage tank contributes significantly to the energy efficiency of your heating system:
- Boiler efficiency: Up to 15% higher efficiency thanks to optimal operating point
- Reduced fuel costs: Less consumption

PDF - Downloads
Further information
-
PRODUCT SAFETY
Družstevní závody Dražice-strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
Czech Republic
Tel.: +420 326 370 911
Email: info@dzd.cz
SHOP STANDORT
Radius
Tags
Countries
- Choosing a selection results in a full page refresh.
- Opens in a new window.