STS Prepaid Water Meter XT815-M
20-digit encrypted token recharge with a built-in ball valve — water revenue collected before it is delivered.
Product overview
The XT815-M is a household prepaid water meter built around the STS (Standard Transfer Specification) prepayment protocol. Water is purchased in advance and loaded into the meter as a 20-digit encrypted token, so no card and no physical recharge point is required — tokens can be distributed by SMS, by a sales office terminal, or through a mobile top-up channel.
A motorised ball valve is built into the meter body. When the credit runs down the valve warns the user by closing once; when credit is exhausted it closes and stays locked until a new token is entered. Every recharge event is written back to the management system, which keeps the utility’s billing data and the meter’s stored credit in step.
Key benefits
Practical advantages for distributors, contractors and project buyers selecting a water meter for daily metering work.
No card, no recharge queue
Credit is loaded as a 20-digit encrypted STS token typed into the keypad: no card, no kiosk, no recharge point
What it means for youYou sell water by SMS, at a counter or through a top-up channel without printing, issuing or replacing a single card — and nobody queues anywhere.
Valve built into the meter body
A motorised ball valve inside the housing closes on zero credit and on tamper, and exercises itself monthly to stay free
What it means for youOne part to buy and install instead of a meter plus an external valve, and no seized valves to free on a service call.
Two-stage low-credit warning
At the warning level the valve closes once and lets the user reopen it with a token; at zero it locks until a valid token arrives
What it means for youMost users top up before the water actually stops, so disconnection complaints and reconnection visits fall without anyone chasing them.
Every recharge writes back to your system
Consumption, credit and status are reported to the management platform each time a token is entered
What it means for youYou reconcile and audit from the office — no site visit to find out what a meter is doing.
Magnetic tamper is logged, not just stopped
An external magnetic field closes the valve and records the event on the meter
What it means for youAttempted theft stops the water and leaves a dated record you can bill against or take into a dispute.
No unmetered water when the battery runs down
Before the battery fails the valve closes and the user is alerted
What it means for youRevenue stays protected right up to the battery change — there is no window where water flows and nothing is counted.
Technical specifications
Check the product parameters used for model selection, quotation review and project documentation.
| Parameter | Value |
|---|---|
| Model | XT815-M mechanical pulse type |
| Metering principle | Mechanical impeller + pulse acquisition (dry dial) |
| Nominal sizes | DN15 / DN20 / DN25 |
| Permanent flow rate Q3 | DN15: 2.5 · DN20: 4.0 · DN25: 6.3 m³/h |
| Turndown ratio | R100 |
| Accuracy class | Class 2 |
| Prepayment protocol | STS (IEC 62055), 20-digit encrypted TOKEN |
| Valve | Built-in motorised ball valve |
| Battery | Long-life lithium battery, 6–10 years service |
| Communication | 4G / LoRa / LoRaWAN |
| Static current | ≤ 20 μA |
| Rated water pressure | 1.6 MPa |
| Temperature class | T30 |
| Ingress protection | IP68 |
| Installation orientation | Horizontal or vertical |
| Applicable standard | GB/T 778.1-5-2018; JJG 162-2019 |
Materials and dimensions
Review the main component materials and dimensions before confirming water conditions, installation space and packaging requirements.
| Component | Material |
|---|---|
| Meter housing | Brass (cast iron / engineering plastic / stainless steel available on other models) |
| Valve | Built-in ball valve that closes on arrears or fault |
| Counter | Vacuum-sealed dry dial |
Where this model is installed
Where this model is already doing the job. Each application page carries the parameters buyers check before they specify.
Applications
Where this model is specified, and who is usually the buyer.
Apartment and dormitory prepayment
Landlords and housing operators who need water paid for in advance before handing over a unit.
Typical buyer: Property manager / landlordOld-community meter replacement
Replacing mechanical meters where arrears are the main problem rather than metering accuracy.
Typical buyer: Municipal utility, retrofit contractorPer-tenant sub-metering
One meter per rented room, so each tenant pays only for what they use.
Typical buyer: Building owner, dormitory operatorProduct FAQ
Answers to common questions about product selection, options and quotation.
Do users need a physical card?
What happens when credit runs out?
Get a quote for STS Prepaid Water Meter XT815-M
Tell us the sizes and quantities you need and we will come back with pricing, lead time and the data sheet.
- Factory-direct pricing with no trading company in between
- OEM branding, dial customisation and private labelling available
- Samples available for evaluation before a full order
- Technical support on sizing, installation and system integration
Prefer to talk to us directly?
- Tel: +86 15615396327
- Email: jiang@sd-chenshuo.com