Master DH 721 – Condensation Dehumidifier (20 l/day)
Available to order: typical lead time 5–10 working days. We confirm the exact date after your order or enquiry.
The Master DH 721 is a mobile condensation dehumidifier for demanding conditions on construction sites, in industry and during renovation work. It removes up to 20 l/24h (at 30 °C / 80 % r.h.) with an air flow of 200 m³/h, is recommended for rooms of up to 156 m² / 390 m³ and collects the condensate in a 4.7-litre water tank. Digital control with built-in hygrostat, timer and a connection for continuous drainage make it suitable for longer drying jobs without interruption.
How it works
Humid room air is drawn in through the air filter and cooled at the cold refrigerant coil; the excess moisture condenses and drains into the water tank. The dried air then passes the warm condenser coil and re-enters the room at a slightly higher temperature.
The digital control panel has an ON/OFF button, humidity up/down buttons, a fan speed button (high/low), a TIMER button and a temperature button. The built-in hygrostat switches the unit on and off automatically: set a target humidity between 40 % and 80 % or select continuous operation. The display shows the room humidity and, at the press of the TEMP button, the room temperature. The timer sets an operating time of 1 to 24 hours; pressed while the unit is off, it pre-sets a delayed start. When the tank is full, the compressor stops and the "Full Water" indicator lights up.
Key benefits
- Automatic humidity control — built-in hygrostat switches the unit on and off as soon as the set humidity is reached; continuous operation is also possible.
- Digital control with timer — operating time of 1 to 24 hours or delayed start, plus display of room humidity and temperature.
- Two fan speeds — high or low ventilation to suit the drying task.
- Overflow protection — automatic shut-off when the water tank is full.
- Continuous drainage — connection for an external condensate drain hose for longer operation without emptying the tank.
- Protected components — air filter on the inlet, easy to clean with a vacuum cleaner or warm water.
- Mobile — castors for moving the unit between rooms and sites.
Typical applications
- Construction projects and renovation
- Limiting and removing moisture damage (water damage restoration)
- Industrial applications in storage and production areas
- Commercial buildings, archives and rental fleets
Operating conditions and installation
- Operating temperature: 5 °C to 35 °C; relative humidity: 35 % to 90 % r.h.
- Minimum room size: 4 m². According to the manual, the unit must not be installed, operated or stored in a room smaller than 4 m² (refrigerant R290).
- Electrical supply: 220–240 V, 50 Hz; power consumption 0.49 kW.
- Indoor use only. Place the unit upright on a flat, level surface with at least 10 cm of free space on either side for efficient air flow, and keep at least 50 cm from flammable materials.
- After transport or tilting, let the unit stand for 12 hours before connecting it to the mains. The manufacturer does not recommend extension leads.
- For continuous drainage, remove the water tank, position the drain spout and connect a suitably sized drain hose leading to a drain without kinks; in very cold conditions protect the drain hose against freezing.
Scope of delivery
The scope of delivery follows the manufacturer's specification; please ask us if you need a detailed list.
Technical data
- Article number: 4512492 · EAN: 5904542923283
- Length without packaging: 335 mm
- Length with packaging: 380 mm
- Width without packaging: 305 mm
- Width with packaging: 350 mm
- Height without packaging: 640 mm
- Height with packaging: 640 mm
- Weight without packaging: 19 kg
- Weight including packaging: 21 kg
- Recommended room size: 156 m² / 390 m³
- Water tank capacity: 4.7 l
- Max. dehumidification capacity: 20 l/24h
- Max. air flow: 200 m³/h
- Mains connection and frequency: 220–240 V, 50 Hz
- Power consumption: 0.49 kW
- Sound pressure level: 42 dB(A)
- Max. operating temperature: 35 °C
- Min. operating temperature: 5 °C
- Minimum room size: 4 m²
- Max. relative humidity: 90 % r.h.
- Min. relative humidity: 35 % r.h.
- CO2 equivalent: 0.0003 t
- GWP factor: 3
- Refrigerant quantity: 90 g
- Refrigerant type: R290
- Device type: condensation
- Equipment: air filter; built-in hygrostat; connection for external condensate drain; continuous operation; digital control; timer function
- Compressor: reciprocating piston compressor
- Condensate drain: hose connection possible; with condensate drain; with condensate tray
- Condensate tank monitoring: overflow protection with automatic switch-off
- Air flow, max. stage: 200 m³/h
- Dehumidification capacity at 30 °C / 80 % r.h.: 20 l/24h
- Dehumidification capacity at 20 °C / 60 % r.h.: 7 l/24h
- Dehumidification capacity, max.: 20 l/24h
Frequently asked questions
Can the DH 721 run unattended for longer periods?
Yes. Connect a drain hose to the continuous drainage spout so that the condensate runs off into a drain; the built-in hygrostat switches the unit on and off according to the set humidity. Without a hose, the unit stops automatically when the 4.7-litre tank is full.
How do I use the timer?
With the unit running, press TIMER to set an operating time of 1 to 24 hours; the compressor stops when the time has elapsed. If you press TIMER while the unit is switched off, you pre-set a delayed start, for example after 2 hours.
Which humidity can I set?
The target humidity can be set between 40 % and 80 % r.h. in 5 % steps, or continuous operation can be selected. The display normally shows the current room humidity.
How do I clean the air filter?
Unplug the unit, remove the filter and clean it with a vacuum cleaner or by tapping it lightly; if it is very dirty, wash it in warm water with a little mild detergent. Let the filter dry completely and do not expose it to direct sunlight.
Original Master equipment (Dantherm Group) — supplied with full manufacturer documentation by BMB Rheinland, your authorised distribution partner.
Planning a project or a larger requirement? Request a quote.
Downloads
Manufacturer information (GPSR)
Manufacturer: Dantherm S.p.A., Via Gardesana 11, 37010 Pastrengo (VR), Italy, info.it@danthermgroup.com, www.danthermgroup.com
Product identification: model and article number as stated on this page and on the type plate.
Safety information and warnings: see the operating manual of the manufacturer supplied with the product.
Product compliance and certifications depend on the specific product and manufacturer.
CE marking: Products carry CE marking where required by applicable EU legislation. The relevant conformity information is provided in the manufacturer's documentation where legally required.
Product-specific standards: Applicable standards, certifications, and classifications, such as HEPA filter classes under EN 1822 or hygiene requirements under VDI 6022, are indicated in the product specifications or manufacturer documentation where verified.
Manufacturer and origin: Products are supplied under their respective manufacturer's brand. The country of origin, quality management certifications, and other manufacturer-specific information are stated only where verified.
Documentation: Available technical information, operating instructions, and conformity documents can be found in the Downloads section or obtained from us upon request, where available. Legally required product documentation is provided in accordance with applicable requirements.
Delivery: We supply business customers and consumers within the European Union, subject to product availability and applicable delivery conditions. Delivery costs and estimated delivery times are provided during the ordering process or in our individual quotation. Freight and pallet deliveries can be arranged depending on the product and delivery address.
Delivery times: The delivery period applicable to your order is stated before purchase or in the individual quotation. For orders requiring separate confirmation, we provide the applicable delivery information before the contract is concluded.
Statutory rights: All customers retain their applicable statutory rights in respect of defective goods. For consumers purchasing new goods, statutory defect claims generally have a limitation period of two years from delivery, subject to applicable legal provisions. Any separate manufacturer's warranty applies only where expressly offered and does not limit statutory rights against us as the seller.
Consumer withdrawal: Consumers generally have a statutory right to withdraw from qualifying distance contracts within 14 days, subject to statutory exceptions. Further information is provided in our Withdrawal Policy (Widerrufsbelehrung).
Business customers: Business purchases are subject to the applicable statutory provisions and any validly agreed contractual conditions. Commercial buyers must comply with their statutory inspection and notification obligations where applicable, including Section 377 of the German Commercial Code (HGB).
Returns and complaints: Please contact us regarding returns, incorrect deliveries, or defective goods so that we can coordinate the next steps. Further information is provided in our Refund Policy and General Terms and Conditions. These policies do not restrict mandatory statutory rights.
For project, bulk, and pallet orders, please contact us for an individual quotation.
