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Metering servicesIn development

Warmio OS

Warmio OS covers the entire workflow of a metering service provider — from device and meter management through remote reading and legally compliant heating cost billing to in-year consumption information for tenants. in the EU, with every service provider disclosed.

This product is still in development — the feature set below shows what is planned. Ask us about the current status — or get in early.

Devices & readings

  • Device and meter management (heating, hot/cold water, heat energy) with location and serial number
  • Radio/remote reading (Smart Metering, walk-by) and mobile manual capture
  • Calibration-deadline monitoring and device replacement planning
  • Interim readings on change of occupant

Billing

  • Heating cost billing under the German Heating Costs Ordinance (Heizkostenverordnung) — base/consumption split
  • Operating and service charge billing
  • CO₂ cost allocation under CO2KostAufG (landlord/tenant)
  • Invoicing and payment reconciliation

Properties & communication

  • Property and building management (buildings, residential units, owners/managers)
  • In-year consumption information for tenants (a legal requirement)
  • Tenant and owner portal, interfaces to property management companies
  • Legally compliant archiving, data in the EU, GDPR-compliant

An overview of the feature set. The exact scope is defined per customer — talk to us about what your industry needs.

Anyone who bills heating costs and water for the housing sector knows the rhythm of the industry: the year runs quietly until the billing period ends — then meter readings have to be captured in large numbers, occupant changes traced and statements produced, while the property managers wait for results. Missing readings, incomplete details on move-ins and move-outs and queries about individual items cost the most time in this phase — often it is only when the statement is being produced that a value turns out to be missing or implausible. And every statement that raises questions with a tenant comes back to your own desk as a complaint via the property manager.

The metering services market is shaped by its history: a few large providers, systems grown over decades, devices and software often from a single source and matched to each other — but hard to switch away from. Smaller metering services frequently work with a mix of industry software, spreadsheets and paper, because up-to-date tools for their size of operation are missing. At the same time, the requirements have risen: remote radio reading is becoming the standard, in-year consumption information is required, and the housing sector expects to receive data digitally instead of as a stack of paper.

A system for metering service providers would have to run properties, devices, meter readings and statements in one continuous flow. Meter readings should arrive where they are needed, without intermediate steps through lists and manual transfers. Occupant changes would be recorded once and would thereby be reflected in the statement, and the property manager could look up the state of a statement themselves instead of asking by phone. Missing values would surface early, not just before the submission deadline — and could be resolved while there is still time to do so.

Traceability matters most. A heating cost statement allocates real costs to real households; every value must be traceable back to the individual reading when a tenant or a property manager asks. A statement that can do this saves long discussions — one that cannot damages trust in the metering service. Added to that is data protection: consumption data allows conclusions about life inside a home and demands careful handling under the General Data Protection Regulation (GDPR). Warmio OS is therefore planned with a data held in the EU, with open technology and no lock-in to any particular provider.

Warmio OS is in development and not yet in use with any metering service. The planned approach: a system that maps the path from meter reading to finished statement in documented form and shows metering services and property managers the same, current state. We are building it step by step and aligning the design with the industry's everyday work, not with feature lists. If you would like to know where development stands, ask us — you will get an honest answer, not a brochure.

Check the numbers

Only 10,8 % of enterprises with 10 to 49 employees use a cloud-based CRM — email, by contrast, 38,7 %.

For metering service providers this means in practice: meter readings, billing and customer communication often sit in separate systems or spreadsheets. That works as long as the same person keeps track of everything — and becomes a problem the moment they are unavailable or the service area grows.

Source: Eurostat, table isoc_cicce_use, Germany 2025, enterprises with 10 to 49 employees.

Securely built, EU-sovereign

EU infrastructure

Data held in the EU — a server exclusively in Germany is available on request.

GDPR from day one

Data protection under EU law, built into every line of code.

Encrypted

TLS transmission, protected access, secured backups.

Your data belongs to you

No vendor lock-in — exportable at any time.