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DIN Rail BTU Meter for Chilled Water — Titan BTU

Thermal Energy Metering. Designed to EN 1434 Class 2.

DIN rail thermal energy meter for chilled-water, hot-water, and district-cooling networks. Dual PT1000 RTDs, external flow input via Modbus RS485, and IAPWS-IF97 water properties for defensible BTU measurement at tenant-billing accuracy.

A BTU meter measures the thermal energy a water loop delivers or extracts, from flow rate and the supply-to-return temperature difference. Titan BTU is a DIN-rail BTU meter for chilled-water tenant sub-billing, district cooling and hot-water networks, designed to EN 1434 Class 2 with dual PT1000 RTDs and Modbus or BACnet output. Pricing starts at ₹17,400 excluding the flow sensor.

EN 1434 Class 2 (design)AccuracyDual PT1000 RTDSensorsModbus RS485Flow InputWiFi + Ethernet + RS485Comms
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Titan BTU DIN Rail Thermal Energy Meter on DIN rail
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At a glance

What it is
A compact DIN-rail BTU (thermal energy) meter for chilled-water, hot-water, and district-cooling networks.
Best for
Tenant chilled-water sub-billing, district cooling, HVAC consultants, and BMS integrators needing per-floor or per-tenant kWh-thermal data.
Standards
Designed to EN 1434 Class 2 thermal accuracy, IAPWS-IF97 water properties, logged audit trail for tenant billing.
Interfaces
Dual PT1000 RTDs (supply + return), external flow meter via Modbus RS485, WiFi + Ethernet for cloud + BMS.
Price & lead time
From ₹17,400 per meter, excluding the flow sensor. Ships from stock; 200+ units in 4 weeks.

Why Titan BTU

Three reasons HVAC consultants, district-cooling operators, ESCOs, and tenant-billing teams reach for Titan BTU.

Designed to EN 1434 Class 2

Thermal energy measurement designed to the international heat-meter standard. Dual PT1000 RTDs on supply and return, external flow meter via Modbus RS485, IAPWS-IF97 water properties for temperature-dependent density and specific heat.

DIN Rail Form Factor

Compact 94×89×69 mm DIN rail housing — fits inside the same control panel as the chiller controls or building electrical metering. Many BTU meters need a separate panel-mount enclosure.

Cloud-Ready Out of the Box

WiFi and Ethernet built in, RS-485 for legacy BMS, Modbus RTU/TCP and BACnet throughout. Stream thermal data to the Energy Intelligence Platform, your existing BMS, or any third-party tenant-billing system without an external gateway.

The Problem

Most BTU meters available in India today are bulky panel-mount devices, often imported, often requiring civil work for the calculator enclosure plus separate flow-meter installation. Locally available DIN rail thermal meters are rare and usually limited in connectivity — RS-485 only, no embedded Ethernet, no built-in BMS-friendly Modbus TCP.

Buildings that should sub-bill chilled water by tenant often skip BTU metering entirely because the install cost is disproportionate. District-cooling operators commission substation BTU meters but lose the data because the legacy communications layer never reaches the operator's SCADA.

Titan BTU is built to fit modern building electrical panels, modern BMS networks, and modern cloud platforms — without forcing a redesign of the existing chilled-water plant.

How It Works

One DIN rail device. Two RTD inputs. One flow signal. EN 1434 thermal energy at the output.

Applications

Where defensible thermal energy measurement earns its keep.

Chilled-Water Tenant Sub-Billing

Per-tenant thermal metering for malls, IT parks, hotels, and commercial buildings. Bill chilled-water consumption at the per-floor or per-tenant level, with a logged audit trail from a meter designed to EN 1434 Class 2.

District Cooling Networks

Substation-side metering for district cooling delivered to individual buildings, with Modbus or BACnet output to the central plant's SCADA or BMS.

Hot Water & Heating Networks

Hot-water and heating-system metering for hotels, hospitals, and large commercial kitchens. Same hardware, swap chilled-water context for hot-water context — IAPWS-IF97 covers both.

Plant Efficiency & ESG Reporting

Thermal output of chillers and heating plant measured in real time. Pair with electrical metering to compute kW/TR and COP; feed corporate ESG reporting tools.

Technical Specifications

Full datasheet — thermal measurement, communication, and mechanical.

Thermal Measurement

ParameterSpecification
Accuracy ClassDesigned to EN 1434 Class 2
Temperature SensorsDual PT1000 RTD (matched pair)
Temperature Range0 °C to +180 °C (typical chilled & hot water service)
Flow InputExternal flow meter via Modbus RS485
Compatible Flow Meter TypesUltrasonic flow meter
Thermal CalculationIAPWS-IF97 water property tables (density + Cp temperature-corrected)
KPIs LoggedThermal kWh, instantaneous kW, ΔT (return − supply for chilled water), flow rate, supply/return temperature
Tariff / TOUUp to 8 tariff zones with TOU/TOD

Communication

ParameterSpecification
InternetWiFi and Ethernet built-in
Wired / LocalRS485 (Master or Slave) — Modbus RTU or BACnet MS/TP, selectable
ProtocolsModbus RTU/TCP, BACnet MS/TP, BACnet/IP
BMS IntegrationDirect Modbus or BACnet, or via Energy Intelligence Platform

Mechanical

ParameterSpecification
MountingDIN rail
Dimensions94 × 89 × 69 mm
Operating Temperature−25 °C to +70 °C
Auxiliary PowerUniversal wide-range AC/DC

How Titan BTU Compares

The four ways buildings handle chilled-water and district-cooling metering today — and how a DIN rail BTU meter changes the install economics.

CapabilityTitan BTUImported Panel-Mount BTU MeterRTD Pair + SpreadsheetNo Thermal Meter (Status Quo)
Form factorDIN rail — fits inside electrical panelPanel-mount + civil enclosuren/an/a
EN 1434 accuracy classDesigned to Class 2Class 2 / 3Not applicableNone
BMS connectivityWiFi + Ethernet + RS485RS485, sometimes EthernetNoneNone
Tenant sub-billing defensibleYesYesNo — disputed at auditNo
Install effortRetrofit on DIN rail in an existing panelSeparate enclosure usually neededManualn/a
Real-time dashboardYes — Energy Intelligence PlatformOptional add-onNoNo
IAPWS-IF97 water propertiesYes — temperature-correctedYesManual approximationn/a
Hot-water + chilled-waterBoth — same hardwareBothBothn/a
District-cooling SCADA fitNative Modbus RTU/TCPModbus, often legacyNoneNone
Indicative price per pointFrom ₹17,400 (ex flow sensor)Varies by supplierLow, but not defensibleZero capex / unmeasured
Lead timeShips from stock; 200+ units in 4 weeks (built in India)Varies with importn/an/a

Standards

The standards Titan BTU is designed to, plus the Indian frameworks it supports for chilled-water sub-metering.

ParameterSpecification
EN 1434Designed to EN 1434 Class 2 (heat meters)
IEC 61010Designed to safety requirements for measurement equipment
IEC 61000Designed to EMC requirements for industrial environments
ECBC 2017ECBC-aligned — supports chilled-water sub-metering requirements
ISHRAEIndian Society of HVAC Engineers reference design alignment
BEE PATSupports PAT thermal energy reporting workflows

Energy Intelligence Platform

Titan BTU pairs with the Energy Intelligence Platform for fleet-wide thermal energy dashboards, per-tenant billing export, district-cooling network mapping, and ECBC-aligned reporting. Operates standalone for sites that prefer to land Modbus data directly in an existing BMS, SCADA, or third-party tenant-billing platform.

Explore the Platform →

Size Your Deployment

Three free engineering resources that pair with Titan BTU for specifying chilled-water and district-cooling deployments:

  • →BTU Meter Sizing Guide — engineering reference for sizing thermal energy meters: flow-meter selection, RTD pairing, EN 1434 Class 2 requirements, common installation gotchas.
  • →BTU Meter Sizing Calculator — plug in your chilled-water load and ΔT, get a meter-size recommendation back instantly.
  • →Chiller COP Calculator — derive COP, kW/TR, and EER from thermal and electrical measurements. Benchmark against ECBC 2017.

Frequently Asked Questions

Common questions about BTU meters, EN 1434, flow meter pairing, and chilled-water tenant billing.

A BTU meter (heat meter / thermal energy meter) measures the thermal energy delivered or extracted by a fluid loop. For chilled water it computes thermal energy as flow × density × specific heat × ΔT, where ΔT = return − supply temperature for chilled water (supply − return for hot water), integrated over time. Titan BTU takes its temperature inputs from a matched PT1000 RTD pair on supply and return, its flow input from an external flow meter over Modbus RS485, and uses IAPWS-IF97 water property tables to keep the calculation accurate across the full operating temperature range.
BTU stands for British Thermal Unit and it measures thermal energy — heat — not electricity. One BTU is the energy needed to raise one pound of water by one degree Fahrenheit, which is about 1,055 joules or 1.055 kJ. In HVAC the rate matters more than the unit: one ton of refrigeration (1 TR) is 12,000 BTU per hour. A BTU meter therefore measures how much cooling or heating actually moved through a pipe, which is what you bill a tenant for or judge a chiller on.
Thermal energy is the product of flow rate, the temperature difference between supply and return, and the density and specific heat of the fluid. The familiar shortcuts are BTU/hr = GPM × 500 × ΔT(°F) for water in imperial units, or kW = m³/h × 1.163 × ΔT(°C) in metric — but both assume fixed water properties. Titan BTU does not use that approximation: it computes density and specific heat from IAPWS-IF97 water properties at the measured temperature every cycle, which is what a meter designed to EN 1434 Class 2 needs across a real chilled-water ΔT.
Same thermal hardware platform, designed to EN 1434 Class 2, dual PT1000 RTDs, same Modbus connectivity. Titan Plus BTU adds a Class 0.5S electrical metering channel on the same device — useful when you also want to measure the chiller's electrical input and compute kW/TR or COP in real time. Titan BTU is the thermal-only configuration: cheaper per measurement point if your electrical metering is handled by another device or if you only need thermal billing.
An ultrasonic flow meter that exposes flow rate over Modbus RS485. The flow meter is sized and selected for the pipe diameter and rate; Titan BTU consumes the rate and pairs it with the temperature pair to produce thermal energy.
Titan BTU is designed to EN 1434 Class 2, the international heat-meter accuracy class; we do not currently hold an EN 1434 certificate. EN 1434 specifies the temperature pair matching, the flow integration, the calculator, and the reporting requirements that European tenant-billing applications and ECBC-aligned commercial buildings reference.
Yes — that is one of the primary use cases. Chilled-water billing per tenant requires defensible thermal energy measurement, which is what Titan BTU is designed for (EN 1434 Class 2). Each tenant gets their own BTU meter on the chilled-water inlet to their floor or zone; the Energy Intelligence Platform aggregates consumption into monthly bills.
Yes — the thermal calculation works equally well for hot-water service. IAPWS-IF97 covers liquid water from 0 °C up through the operating range typical of building heating systems. Same hardware, same temperature-pair installation, just the supply/return roles reversed in the BMS configuration.
Yes. District cooling substations use BTU meters at every building connection to allocate cooling consumption back to the central plant. Titan BTU's DIN rail form factor fits substation control panels, and Modbus RTU/TCP or BACnet integrates with district-cooling SCADA and BMS systems.
Tech OVN manufactures the Titan BTU thermal energy meter in India — a DIN-rail BTU meter for chilled-water HVAC, chiller plants, and district cooling, with PT1000 RTDs and Modbus/BMS output. Regular orders ship from stock; orders of 200+ units take 4 weeks.
A Titan BTU chilled-water meter starts at ₹17,400 (ex-flow-sensor); final price depends on pipe size and the flow meter paired with it. Because it is DIN-rail and BMS-ready, it fits an existing panel without a separate calculator enclosure.

The Titan Family — One Platform, 11 Applications

The same accuracy, connectivity, and design language across the full metering range.

ProductDescriptionStatus
TITANCore smart energy meter. WiFi + Ethernet + RS485Available
TITAN AUDITRapid deployment logger. Split-core CT, plug & playAvailable
TITAN EVEV charge controller. OCPP 1.6J + 2.0.1, designed to IEC 61851Available
TITAN PQPower quality meter. Harmonics, sags, swells, flicker, transientsComing Soon
TITAN ASSETCondition monitoring. Energy + vibration + temperatureAvailable
TITAN PLUS BTUChiller efficiency meter. kW/TR + BTU on a single deviceAvailable
TITAN BTUYou are hereBTU meter. Chilled water, hot water, district coolingAvailable
TITAN COMPLIANCEFire pump monitoring. NFPA 25 / IS 15301 test loggingAvailable
TITAN PUMPPump controller. Dry-run protection + energy monitoring + remote startAvailable
TITAN PUMP RMSRemote pump monitoring. 4G, run hours + dry run + fault alertsAvailable
TITAN BLOWERBlower controller. Filter-clog + over-pressure protection + energy monitoringAvailable

Ready to specify Titan BTU for your next project?

Talk to an engineer about deployment for chilled-water sub-billing, district cooling, or hot-water plant metering.

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