Smart Water Meters for London Homes: Leak Alerts and Monitoring

What Is a Smart Water Meter and How Does It Differ from a Standard Meter?

A smart water meter is a water meter that is equipped with a radio or cellular transmitter that sends meter readings automatically to the water company at regular intervals, typically hourly or daily, rather than requiring a manual reading visit by a meter reader or a self-reported reading from the customer. Thames Water has been installing smart meters across London since 2016 as part of its metering programme, and by the mid-2020s a significant proportion of metered London properties were served by smart meters capable of transmitting automated readings.

Standard water meters, like the ones that have been installed in London since metering began in the 1990s, record total consumption as a cumulative figure and must be read manually or by the customer submitting a reading online or by telephone. Smart meters remove the need for estimated bills or customer reads by transmitting accurate readings automatically. Beyond this basic administrative convenience, the hourly or daily granularity of smart meter data enables a range of additional services that are not possible with a standard meter, including leak detection alerts, consumption pattern analysis, and budget management tools.

How Thames Water Uses Smart Meter Data for Leak Detection

Thames Water uses the hourly consumption data from smart meters to identify patterns that are consistent with a slow continuous leak in the property supply pipework. A household that uses no water for eight or more hours consecutively, such as during the night, should show zero consumption during that period on the smart meter data. If the smart meter records a continuous low-level flow throughout the night on multiple consecutive nights, this pattern is consistent with a leak in the supply pipework and Thames Water may alert the customer proactively.

The Thames Water WaterSure and My Account online portal allows customers with smart meters to view their hourly consumption data, set consumption alerts, and compare their usage against similar households in their area. A customer who notices an unusual upward step in their daily consumption data, particularly if it is consistent and does not correspond to any change in household activities, should arrange a leak investigation as soon as possible to avoid accumulating a large bill for wasted water.

The Customer Portal: Reading and Acting on Smart Meter Data

Customers served by a Thames Water smart meter can register for online access to their meter data through the Thames Water online account portal. Once registered, the portal provides a dashboard showing daily and hourly consumption in cubic metres, a comparison against the customer previous period consumption and against similar households, and a history of the past twelve months of data. Consumption alerts can be set to trigger an email or text message notification if daily consumption exceeds a threshold set by the customer, which is useful for detecting sudden increases due to a leak or an appliance malfunction.

For London landlords with multiple metered properties, the ability to monitor consumption data remotely is particularly valuable. A sudden increase in consumption at a rental property where tenants are not reporting any issues may indicate a hidden leak in the supply pipework or a running toilet that the tenants have not noticed or have not yet reported. Monitoring consumption data proactively allows the landlord to identify and repair leaks before the bill for wasted water becomes large, and to demonstrate active water management to tenants as part of a responsible property management approach.

Requesting a Smart Meter Upgrade in London

If your London property has a standard water meter and you would like to upgrade to a smart meter, you can request an upgrade through the Thames Water website or by calling the Thames Water metering team. Thames Water smart meter installations are carried out free of charge as part of the company metering programme, and the smart meter is installed in the existing meter chamber without any internal work to the property. In some areas of London where the smart meter rollout is ahead of schedule, Thames Water may proactively offer customers an upgrade without them needing to request it.

Properties that do not yet have a water meter can request both an initial meter installation and a smart meter upgrade at the same time, and Thames Water will endeavour to install a smart meter as the first meter if the technology is available in that metering district. The customer will typically be contacted by Thames Water to arrange an installation appointment, and the meter will be installed within 20 working days in most London areas.

How Prestige Engineers Can Help with Leak Investigations Following Smart Meter Alerts

When a Thames Water smart meter alert or a review of consumption data suggests that a London property may have a hidden leak, Prestige Engineers can carry out a comprehensive leak investigation to identify and repair the source. The investigation begins with a confirmatory meter test to verify that water is flowing through the meter when all outlets are closed, followed by acoustic detection to identify the precise location of the leak. Once located, the leak is repaired and a second meter test confirms that the flow through the meter has stopped.

In cases where the leak is in the section of supply pipe that is Thames Water responsibility, Prestige Engineers will advise the customer to report the leak to Thames Water so that Thames Water can carry out the repair at their cost. For leaks in the section of supply pipe between the boundary stopcock and the internal outlets, Prestige Engineers carry out the repair and can provide all the documentation required for a Thames Water leak allowance application if the customer is seeking a credit for excess water charges incurred while the leak was running undetected.