HydroWatch MP
It uses the incoming mains cold-water supply to fill, pressurise and continuously maintain the system, replacing the traditional combination of an RPZ valve, fill loop and pressure switch with a single integrated unit.
Unlike conventional pressurisation kit, HydroWatch MP measures every litre it delivers. It reports the system’s average daily water loss, calculates the volume of inhibitor required for correct dilution, and gives the building manager actionable data on system integrity — not just an alarm contact when something has already gone wrong.
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The HydroWatch Mains-Pressure Automatic Pressurisation and Monitoring Unit
The NEW HydroWatch MP Mains-Pressure Automatic Pressurisation and Monitoring Unit uses the incoming mains cold-water supply to fill, pressurise and continuously maintain the system, replacing the traditional combination of an RPZ valve, fill loop and pressure switch with a single integrated unit.HydroWatch MP Advanced Features
It measures, it doesn’t just maintain
- Accurate fill-volume and fill-rate measurement; no bypass hose required.
- Displays the average amount of water lost per day on the LCD panel.
- Slow leaks, weeping joints and failing seals show up as a trend on the controller and over MODBUS.
Minor pressure losses — typically due to small leaks, air venting or service work — trigger a measured re-pressurisation cycle.
Significant losses raise the appropriate alarm. The 24-hour fill timeout halts a cycle that fails to reach pressure (for example, during a major leak) and is reset with a single button press once the underlying problem has been addressed.
Backflow Compliance
- Incorporates a physical air break to provide Fluid Category 5 backflow protection in accordance with the Water Supply (Water Fittings) Regulations 1999 and BS EN 1717.
- Designed to replace RPZ-valve-based filling arrangements on sealed systems.
It commissions itself
The installer enters six items — system type, kW rating, static head, PRV rating, expansion-tank volume and precharge. HydroWatch MP calculates and sets every operating set point, alarm threshold, and timer automatically.
System features:
- Automatic system-inhibitor dose calculation
- 24-hour fill timeout, resettable from the front panel
- Pumpless operation
- Twin electronic pressure sensors – mains supply and circulating system
- Self-commissioning controller with on-screen guided set-up
- “Limp” mode for fluctuating mains supplies
- Backlit LCD display with four-button keypad and multi-colour status LEDs
- Fault history (most recent three events), pump run-hours and mains-voltage logging
- MODBUS RTU over RS485 for full Building Management System integration
- Three volt-free dry-contact relays
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HydroWatch MP
Operating principle
Mains-pressure, pumpless
Mains supply pressure range
1.5 – 9.0 bar
System fill pressure
To within 0.3 bar of available mains pressure
Inlet / outlet connections
15 mm BSP, isolating valves fitted
Inlet filter
Serviceable in-line mesh
Tundish drain
¾" BSP
Power supply
230 V / 50 Hz, 1.5 m flex with fused plug
Control valves
24 V DC solenoid
Pressure sensors
2 × electronic (mains and system)
Display
Backlit LCD, 4-button keypad, multi-colour status LEDs
Volt-free outputs
3 × dry contact (HP, LP, General) — selectable NO/NC, 24 V / 1 A resistive
BMS interface
MODBUS RTU over RS485 (8 data, no parity, 1 stop)
Fill timeout
24 hours, resettable
Mounting
Vertical wall-mount; 5 × self-tapping fixings supplied
Clearances
600 mm front, 150 mm each side, 1000 mm above
Backflow protection
Physical air break — Fluid Category 5 (BS EN 1717 / Water Supply (Water Fittings) Regulations 1999
Approvals
WRAS approval in progress
Shipping Weight
2kg
For installation and commissioning details, please refer to the brochure and manual located under the documents tab.
Compliance
HydroWatch MP complies with with the Water Supply (Water Fittings) Regulations 1999 and BS EN 1717. -
