Introduction to Ajax WaterStop Smart Motorised Shut-off Valve (DN25 / 1")
Ajax WaterStopis a professional-grade smart shut-off valve kit that combines a high-torque electric actuator with a RuB/Bonomi brass ball valve to deliver automated water isolation for homes and commercial properties. Sold under SKU ITM003239 as the DN25 / 1" size, this model is part of the Ajax WaterStop family that connects wirelessly to Ajax Hubs via the Jeweller radio protocol. Designed to close quickly on leak detection or operate manually and remotely, the WaterStop is aimed at preventing water damage, minimising repair costs and adding a reliable layer of protection to monitored alarm and automation systems.
Key features at a glance:
- Integration:Two-way Jeweller radio for seamless integration with Ajax Hubs and leak detectors.
- Robust valve:RuB (Bonomi/RuB) brass ball valve available in DN15, DN20, DN25.
- Power options:4 × CR123A batteries (preinstalled) with optional 9 V DC / 2 A external supply.
- Fast and powerful:Up to 8.5 N·m torque and 5–7 s typical closing time.
- Security & compliance:Anti-tamper lock, sabotage alarm and regional certifications — check datasheet for CE/UKCA.
Detailed specifications and benefits
The Ajax WaterStop DN25 is engineered for reliability and simplicity. Below are the most important technical specifications and the practical benefits they deliver.
- Product family / protocol:WaterStop (Jeweller)
- Connection sizes:½" (DN15), ¾" (DN20), 1" (DN25) — this article focuses on DN25
- Radio frequency & range:868/915 MHz depending on region; up to 1,100 m open-field range
- Max radiated power:Up to 20 mW ERP
- Actuator torque:Up to 8.5 N·m
- Closing time:Typically 5–7 seconds (size and condition dependent)
- Operating pressure:Up to 10 bar
- Liquid temperature range:Approx. −20 °C to +170 °C (size dependent)
- Valve material:RuB brass (Bonomi / RuB)
- Power / Batteries:4 × CR123A preinstalled; optional 9 V DC (2 A) input
- Battery life:Up to ~3 years (usage dependent)
- Tamper protection:Anti-tamper mounting lock and sabotage alarm
- Dimensions & weight:≈104 × 150 × 70 mm; ~0.87–1.01 kg depending on size
- Warranty:24 months (region dependent)
- Manufacturer:Ajax Systems
- SKU:ITM003239
- Rapid response to leaks:With typical closing times under 7 seconds, the valve can isolate a water supply quickly to prevent catastrophic damage from burst pipes or persistent leaks.
- Reliable, service-grade valve:The RuB brass ball valve is an industrial plumbing component known for durability, corrosion resistance and stable performance under typical building water pressures (up to 10 bar).
- Flexible power strategy:Battery operation keeps the unit functional during power outages and avoids the need for mains wiring at every location. Where constant power is preferred, the optional 9 V DC input supports uninterrupted operation and can reduce battery replacement frequency.
- Secure, tamper-aware installation:The anti-tamper mounting lock and sabotage alarm help ensure the valve cannot be disabled unnoticed — important for monitored installations.
- Wide integration possibilities:Because WaterStop uses Ajax’s Jeweller protocol, it integrates tightly with Ajax Hubs, leak detectors and automation scenarios for coordinated responses (close valve, send alarm, notify users, trigger cameras, etc.).
Use cases and scenarios where Ajax WaterStop excels
The Ajax WaterStop DN25 is suited to a range of applications, from single-family homes to light commercial sites. Typical scenarios include:
- Residential leak protection:Protect basements, bathrooms, kitchens and utility rooms. If a leak detector senses water, the WaterStop isolates supply to prevent flooding while the system notifies occupants or a monitoring centre.
- Vacation homes and short-term rentals:Remote owners can rely on automated shut-off if a leak occurs while the property is unoccupied, reducing the risk of long-term water damage.
- Property management and landlords:Installed at a tenant meter or building riser, WaterStop can reduce liability and maintenance costs by stopping leaks early and alerting managers.
- Commercial and light industrial sites:Small offices, retail outlets or technical rooms benefit from automated isolation of water during maintenance or emergency situations.
- Contractor installations:Plumbers and security integrators can offer a premium service by adding WaterStop to monitored systems, combining leak detection with forced isolation and remote control.
- Integration with monitoring services:In centrally monitored alarm systems, WaterStop can act on triggers to shut off a supply before an emergency escalates, and provide status information to a monitoring station.
Comparisons with similar products on the market
Smart shut-off valves are an increasingly common way to protect properties from water damage. When comparing Ajax WaterStop to alternatives, consider the following dimensions: integration, valve quality, power options, installation and ecosystem.
Ajax WaterStop’s primary strength is deep integration into the Ajax security ecosystem via Jeweller radio. That makes it an excellent choice where an Ajax Hub and Ajax leak detectors are already in place. Competing products that pair with their own hubs (for example, some offerings from LeakSmart, Moen Flo or Phyn) may provide similar automation, but require their own platform and subscription to get full functionality.
The inclusion of a RuB/Bonomi brass ball valve is a distinguishing point: RuB is a recognised manufacturer of plumbing valves used by professionals. Some consumer-focused smart valves use plastic components or lower-spec valves, which may not match the mechanical longevity of a brass ball valve rated to 10 bar and high temperatures.
Battery operation with optional mains input gives WaterStop flexibility. Systems that depend solely on mains power can fail during outages; conversely, fully battery-only products might require more frequent maintenance. Ajax’s balance of CR123A batteries with an optional 9 V DC input is practical for most installs.
Ajax recommends qualified plumbers or authorised installers for compliant installation — a necessary requirement for many commercial and insured installations. Some other smart valves are designed for DIY installs and may sacrifice valve/spec robustness for ease of fitment. For properties where compliance and durability matter, a professional-grade valve like WaterStop typically provides better long-term value.
Customer feedback and sample reviews
Public, anonymised feedback for professional smart valves tends to highlight three recurring themes: peace of mind, integration convenience and reliability. Example, anonymised testimonials that reflect typical user experiences:
- Homeowner, UK:"Installed with my Ajax system — the WaterStop closed instantly when my leak detector tripped. Saved me from a flooded utility room while I was away."
- Property manager, Netherlands:"We fitted WaterStop units on several rental properties. The tenants appreciate the app control, and we like the brass valve — it feels like a proper piece of plumbing, not a gadget."
- Installer, Poland:"Good radio range and reliable actuation. Recommend using the optional power input on high-usage sites to extend battery life."
Note: these sample comments summarise common user sentiment observed in the market and in installer feedback; verify current user reviews for regional specifics and real customer quotes.
Conclusion — why choose Ajax WaterStop DN25 (ITM003239)?
For homeowners, landlords, facility managers and security integrators seeking a robust, professionally specified smart shut-off valve, the Ajax WaterStop DN25 stands out for several reasons: it combines an industrial-grade RuB brass valve with a powerful actuator, it integrates seamlessly into the Ajax security and automation ecosystem via the Jeweller radio protocol, and it offers practical power options for resilient operation. With fast closing times, tamper protection and a warranty backed by Ajax Systems, the product is particularly well-suited to monitored installations where rapid intervention makes the difference between a small leak and major property loss.
Before purchase and installation, confirm regional certifications (CE/UKCA where applicable), choose the correct valve size for your plumbing (DN25 for 1" connections) and have a qualified plumber or authorised installer commission the unit to ensure compliance with local regulations. At a suggested retail price of approximately 199.99 (check local pricing and availability), Ajax WaterStop delivers a blend of reliability, integration and professional plumbing standards that make it a compelling choice for serious water damage prevention.
