Public sector
Collective housing, municipal pools, educational facilities.
Key benefits
Limescale in Collective Water Networks
Multi-unit residential buildings, social housing complexes, condominiums, and public facilities face a unique and costly challenge with limescale. Unlike single-family homes where one household bears the impact, collective water networks amplify scale problems across dozens or hundreds of connected units, creating systemic failures that are expensive and disruptive to remediate. The central hot water production system — whether a gas-fired boiler room, a heat pump installation, or a district heating substation — is the primary victim. Heat exchanger surfaces in collective boilers accumulate calcium carbonate deposits that reduce thermal efficiency progressively: every millimeter of scale on a heat exchanger surface increases energy consumption by approximately 7-10%. For a 100-unit building spending €40,000-60,000 annually on hot water heating, this translates to €3,000-6,000 per year in wasted energy from scale deposits alone. Beyond the boiler room, limescale accumulates throughout the entire distribution network. Vertical risers serving upper floors develop progressive narrowing that reduces water pressure and flow rate to top-floor apartments. Horizontal distribution branches within apartments lose diameter over years of service, leading to resident complaints about low pressure, slow hot water delivery, and temperature inconsistency. Recirculation loops — essential for maintaining hot water availability throughout large buildings — suffer particular fouling because the constant circulation at elevated temperatures creates ideal conditions for continuous scale deposition. Mixing valves, pressure reducing valves, thermostatic cartridges, and individual apartment meters all degrade faster in hard water areas, generating a steady stream of maintenance calls that burden building management budgets and frustrate residents.
LIMPEO for Multi-Unit Buildings
LIMPEO electromagnetic water treatment offers a uniquely practical solution for multi-unit building water networks because a single installation at the building's main water entry point protects the entire collective system — boiler room, distribution risers, recirculation loops, and every connected apartment — without any intervention inside individual units. The LIMPEO device is installed on the main water supply pipe where it enters the building, typically in the technical room or basement. For most multi-unit buildings with 20 to 150 apartments, the main supply pipe is 63 to 110 mm diameter, corresponding to the LIMPEO J-630 or J-1100-P models respectively. Installation is completely non-invasive: the device clamps around the exterior of the existing pipe without cutting, welding, or any modification to the plumbing system. No water shutoff is required, and installation takes approximately one hour. From the moment of activation, all water flowing into the building receives electromagnetic treatment that converts dissolved calcium carbonate from calcite to aragonite crystallization. This means new scale deposits cannot form on any surface throughout the building's water network — from the boiler heat exchanger to the faucet aerator in the furthest apartment. Over the following 3-6 months, the treated water also gradually softens and removes existing scale deposits from pipes, valves, and fixtures throughout the building. The treatment requires no chemicals, no salt, no consumables, and no ongoing maintenance. There is no impact on water quality, taste, or potability. The device operates silently at under 50 watts electrical consumption and has a guaranteed lifespan of 25 years. For building managers and condominium associations, this represents a single capital investment that provides building-wide water treatment protection for a quarter century with zero ongoing costs.
Savings for Building Managers
The financial case for LIMPEO in multi-unit buildings is driven by measurable savings across four primary cost categories that building managers and condominium associations track closely. Energy savings on collective hot water production represent the largest benefit. By maintaining clean heat exchanger surfaces in the building's boiler or hot water production system, LIMPEO ensures thermal efficiency remains at the manufacturer's design specification rather than degrading by 7-10% per millimeter of accumulated scale. For an 80-unit building with annual hot water energy costs of €45,000-55,000, maintaining scale-free heat exchangers saves €4,000-8,000 per year in energy costs alone. Over LIMPEO's 25-year lifespan, cumulative energy savings reach €100,000-200,000. Maintenance cost reduction is equally significant. Scale-related maintenance in collective buildings includes annual or biannual boiler descaling interventions (€2,000-5,000 per service), replacement of scaled thermostatic mixing valves and cartridges (€50-120 per unit, with dozens failing annually in hard water areas), pressure reducing valve replacement, water meter malfunction, and emergency plumbing calls for blocked pipes. Buildings using LIMPEO consistently report 40-60% reduction in plumbing maintenance costs, typically saving €5,000-15,000 annually depending on building size and water hardness. Equipment lifespan extension provides long-term capital expenditure savings: collective boilers, heat exchangers, circulation pumps, expansion vessels, and distribution valves all last significantly longer when operating with treated water. A collective boiler that might require replacement after 12-15 years in hard water can operate for 20-25 years with LIMPEO protection, deferring a €30,000-80,000 capital replacement. Resident satisfaction improvement — fewer complaints about low pressure, slow hot water delivery, and malfunctioning fixtures — reduces management overhead and improves the building's overall service quality.
Implementation and Technical Support
JAEGER SAS provides a comprehensive implementation process for multi-unit building installations, designed to address the specific requirements of building managers, condominium associations, and social housing operators. The process begins with a free technical site study: a JAEGER SAS technician visits the building to assess the water supply configuration, measure pipe diameters and materials, test incoming water hardness, map the hot water production and distribution system, and identify the optimal installation point. This study typically takes 1-2 hours and results in a detailed technical recommendation with exact model specification and quoted pricing. For condominiums, JAEGER SAS provides documentation formatted for presentation at the general assembly, including projected savings calculations, technical specifications, and reference installations for similar buildings. Installation is scheduled at the building manager's convenience and completed in approximately one hour without any water service interruption. The device is mounted in the main technical room, requiring only a standard electrical outlet. Commissioning includes recording baseline measurements: incoming water hardness, hot water temperature at production and at delivery points, water pressure at representative locations, and photographic documentation of accessible heat exchanger and pipe conditions. Follow-up measurements are conducted at 3 and 6 months post-installation to document treatment effectiveness. These reports provide building managers with quantified evidence of scale reduction and efficiency improvement for their annual management reporting. For social housing operators managing portfolios of multiple buildings, JAEGER SAS offers fleet pricing and centralized technical follow-up across all installations. The 25-year device lifespan with zero maintenance aligns perfectly with social housing asset management horizons, and the documented energy savings contribute directly to regulatory energy performance improvement requirements under European building energy directives.
LIMPEO multi-unit buildings: key figures
15-25%
Energy savings on collective hot water production
40-60%
Reduction in plumbing maintenance costs
1 device
Single installation protects the entire building
25 years
Guaranteed lifespan, zero consumables or maintenance
Case Study: 80-Unit Social Housing Complex
An 80-unit social housing complex in central France, managed by a regional social housing operator, faced persistent and escalating water-related maintenance costs. The building, constructed in 1985, received municipal water at 34°f hardness (340 mg/L CaCO3) through a 90 mm main supply pipe feeding a centralized gas-fired boiler room producing domestic hot water for all apartments. Annual hot water energy costs had risen to €52,000 despite stable consumption volumes, indicating progressive heat exchanger fouling. The boiler room required professional descaling every 18 months at €4,200 per intervention. Plumbing maintenance calls averaged 85 per year — predominantly thermostatic cartridge failures, blocked aerators, and low hot water pressure complaints from upper-floor apartments. Annual plumbing maintenance expenditure reached €18,000 including parts, labor, and emergency call-out fees. A water pressure survey revealed that top-floor apartments received only 1.8 bar dynamic pressure at peak hours, below the 2.0 bar minimum specified in French building regulations. Pipe inspections in accessible sections showed 3-5 mm of calcium carbonate buildup reducing effective pipe diameter by 15-20%. The social housing operator evaluated three options: full pipe network replacement (€180,000 estimated), installation of a water softener system (€12,000 purchase plus €3,500 annual salt and maintenance), or LIMPEO electromagnetic treatment. A LIMPEO J-1100-P was installed on the 90 mm main water entry pipe in the basement technical room. Installation was completed in one hour with no water service interruption to residents.
Results after 18 months
After 18 months of continuous LIMPEO operation, the social housing operator documented comprehensive improvements across all monitored parameters. Boiler efficiency: gas consumption for hot water production decreased by 18% year-over-year, reducing annual energy costs from €52,000 to €42,600 — a saving of €9,400. Heat exchanger inspection at the 18-month mark showed clean surfaces with only trace mineral residue, and the scheduled descaling intervention was cancelled. Plumbing maintenance calls decreased from 85 per year to 34 — a 60% reduction — with thermostatic cartridge failures dropping most dramatically as the treated water stopped degrading internal sealing surfaces. Annual plumbing maintenance costs fell from €18,000 to €7,200. Water pressure at top-floor apartments improved from 1.8 bar to 2.3 bar as existing scale deposits in vertical risers gradually softened and detached over the first 6 months. Resident complaints related to water pressure and hot water delivery time decreased by 75%. Total verified annual savings reached €19,200 (€9,400 energy plus €9,800 maintenance reduction). With a total LIMPEO investment of €8,500 including installation and commissioning, full return on investment was achieved in just 5.3 months. The social housing operator has since approved LIMPEO installation across 12 additional buildings in its portfolio, standardizing electromagnetic water treatment as part of its building asset management strategy.