JS hot water meter, type GSD8-RFM, DN20 (3/4"), Q3 = 4.0 m³/h, R100/50, Tmax: 90 °C, L = 130 mm, GZ1" connection, dry‑running, non‑magnetic, for remote reading. 8MA00C24SSDIVS

Single‑jet water meter, dry‑running, with anti‑magnetic protection and radio reading

The GSD8-RFM water meter is designed for measuring hot water consumption up to 90 °C and cold water without temperature limits. Engineered for circuits that require high accuracy and durability, it operates stably even at low flows. Its construction eliminates errors caused by slip or clutch breakage thanks to a reinforced four‑pole magnetic coupling that keeps the rotor in hydromagnetic balance, ensuring constant measurement precision throughout its service life.

The eight‑drum counter rotates 360° to provide a clear and durable reading, and a sapphire stone in the mechanism’s support increases sensitivity to small flows and extends the device’s lifespan. An additional anti‑magnetic ring protects against interference from external magnetic fields – an important feature in modern installations where the risk of tampering or interference is real.

The GZ1" (DN20) connection allows easy installation in existing systems, and the 130 mm length requires no extra adaptations during fitting. The device meets the MID directive requirements and is approved for measuring water intended for consumption, confirmed by a hygienic certificate. Accuracy class R100-H / R50-V guarantees reliable results under both medium and low loads.

The RFM version does not include a built‑in pulse transmitter, but it is ready for one to be added. In practice, the installer can attach a Wireless M-BUS radio module or a wired M-BUS module during a retrofit or new installation – without having to replace the whole meter. This flexibility reduces long‑term costs and enables gradual implementation of remote‑reading systems.

Working pressure up to 16 bar and a temperature range of T30/90 make this model suitable for both heating system loops and domestic hot‑water circuits – without risk of damage during failure or overheating. Weighing 0.6 kg and with a compact height of 75 mm, it is easy to transport and install even in confined spaces.

There are no compromises: no plastic parts in the counting mechanism, no weak magnetic isolation, no “approximate” measurements. This is a tool for those who need certainty that every litre of water is measured accurately.