Minol Zenner MTWD-M-CC DN25 Multi-Jet Dry-Dial Hot Water Meter 260 mm
Minol Zenner MTWD-M-CC DN25 Multi-Jet Dry-Dial Hot Water Meter 260 mm
- Minol Zenner MTWD-M-CC multi-jet, dry-dial mechanical hot water meter
- Size DN25 (1”), meter thread G1¼ B (connects to 1” pipework with unions)
- Permanent flow rate Q3 6.3 m³/h or 10 m³/h (the manufacturer makes DN25 in two versions; the applicable value is shown on the meter label)
- Measuring range (R = Q3/Q1): R80 for horizontal installation, R40 for vertical installation
- Temperature range 0.1–90 °C
- Body length (L) 260 mm; approx. 378 mm including union fittings
- Installation: horizontal or vertical
- Communication: selectable in the product options — without module, or with pulse, M-Bus or wM-Bus module
- Operating pressure MAP 16 (16 bar), pressure loss class 0.63 bar; glass/copper register IP68
- MID: EU type-examination certificate DE-13-MI001-PTB001 (PTB, Germany)
Minol Zenner MTWD Series
The ZENNER MTWD is a dry-dial multi-jet water meter made from special materials to measure hot water up to 90 °C. In the MTWD-M-CC version, the 8-digit register sits in a flood-proof, hermetically sealed glass/copper housing (IP68) and is fitted with a modulator disc that allows remote reading modules to detect consumption electronically without affecting the meter's measurement.
Water enters the measuring chamber through multiple jets around the impeller; according to the manufacturer, this design minimizes bearing load and ensures a long service life. The rotation of the impeller is transmitted by a protected magnetic coupling to the dry register, which is separated from the water.
Key Features
- Multi-jet dry dial; the rotation of the impeller is transmitted to the register by a protected magnetic coupling
- Made from special materials for hot water up to 90 °C
- 8-digit, flood-proof, hermetically sealed glass/copper register (IP68); smallest reading 0.02 liters, largest 99,999.999 m³
- Register with modulator disc: the remote reading module performs electronic sensing without affecting the meter's measurement
- Register rotatable by 355°; after the meter is installed, it is turned to face the reading direction
- Brass body compliant with the UBA (German Federal Environment Agency) list
- Horizontal and vertical installation; no straight pipe runs required upstream or downstream of the meter (U0/D0)
- Retrofittable EDC modules: wM-Bus (868 MHz) or LoRaWAN radio module, combined M-Bus + pulse module (1 liter/pulse); the module is fitted without breaking the meter's seals
MTWD-M-CC Size, Dimensions and Flow Rate Table
| Size | Meter thread | Body length L (mm) | Q3 (m³/h) | Q4 (m³/h) | R horizontal / vertical | Starting flow rate (l/h) |
|---|---|---|---|---|---|---|
| DN25 (1”) | G1¼ B | 260 | 6,3 | 7,88 | R80 / R40 | < 18 |
| DN25 (1”) | G1¼ B | 260 | 10 | 12,5 | R80 / R40 | < 18 |
| DN32 (1¼”) | G1½ B | 260 | 10 | 12,5 | R80 / R40 | < 18 |
| DN40 (1½”) | G2 B | 300 | 16 | 20 | R80 / R40 | < 40 |
Values are taken from the manufacturer's datasheet; the Q3 and R values of the installed meter are shown on its label. All versions: temperature range 0.1–90 °C, operating pressure MAP 16, pressure loss class 0.63 bar.
Applications
- Measuring hot water consumption at block, riser and building entrances in central hot water systems
- Consumption-based allocation of hot water costs between blocks or apartments
- Buildings with high hot water consumption such as hotels, dormitories, hospitals and sports facilities
- M-Bus, wM-Bus or LoRaWAN remote meter reading systems
Why Minol Zenner MTWD-M-CC?
The MTWD-M-CC measures hot water up to 90 °C in DN25 lines; its hermetically sealed glass/copper register is unaffected by moisture and flooding, so it stays legible in installation cabinets and damp shafts. It is suitable for horizontal and vertical installation and requires no straight pipe runs; the meter can be purchased without a module and later upgraded to remote meter reading via M-Bus, wM-Bus or LoRaWAN by fitting an EDC module.
Installation, Reading and Re-verification
Install the meter in the hot water line with the arrow on the body pointing in the direction of flow and without mechanical stress; the measuring range is R80 for horizontal and R40 for vertical installation. A strainer upstream of the meter (in case of dirty water) and a valve on each side make maintenance and replacement easier; open the valves slowly to avoid pressure surges.
The meter is read from the 8-digit register. When an EDC module is fitted, the meter reading is collected remotely over the M-Bus line or the wM-Bus / LoRaWAN radio network; the pulse output of the combined module provides 1 liter/pulse.
Check your local regulations for the periodic re-verification requirements of hot water meters.
In Türkiye, Novus Energy provides remote meter reading services for buildings with central heating systems.
Other models: DN25 Hot Water Meter · Hot water meters · All water meters · All products of the brand: Minol Zenner
| Meter Type | : | Hot Water |
| Body Size (DN) | : | DN25 (1″) |
| Meter Design | : | Multi-Jet |
| Permanent Flow Rate (Q3) | : | 6.3 m³/h, 10 m³/h |
| Body Length (L) | : | 260 mm |
| Connection Type | : | Threaded |
| Remote Reading | : | Pulse, M-Bus, wM-Bus (RF) |
| Max. Water Temperature | : | 90 °C |
| Measuring Range (R) | : | R80 |