RHI Heat Meters
Heat meters used to claim the Renewable Heat Incentive (RHI) must meet specific requirements for:
positioning
calibration and accuracy
suitability (e.g. is the meter set up correctly for the liquid in the system)
installation (meters must be installed in line with manufacturer's instructions and appropriate for the system they are monitoring, e.g. flow rates)
Heat meters must be Measuring Instruments Directive (MID) compliant. For the Non-Domestic RHI must also comply with accuracy class 2 or better of the Measuring Instruments Directive (MID). If heat meters are required for the Domestic RHI this means accuracy class 3 or better.
The following is a non-exhaustive list of heat meters that have been independently verified as MID-compliant.
| Meter | Manufacturer | MID class | Min pipe size | Max pipe size |
| Hydrometer Ray | Diehl Metering Group | Class 2 | 15mm | 20mm |
| Hydrometer Sharky | Diehl Metering Group | Class 2 | 15mm | 100mm |
| ISOFLUX IFX-M4-01 | ISOIL INDUSTRIA SPA | Class 2 | 25mm | 100mm |
| ISOFLUX IFX-M4-03 | ISOIL INDUSTRIA SPA | Class 2 | 15mm | 50mm |
| ISOFLUX IFX-M4-04 | ISOIL INDUSTRIA SPA | Class 2 | 25mm | 100mm |
| ISONRG ML311 | ISOIL INDUSTRIA SPA | - | N/A | N/A |
| Ista Sensonic II Compact Version | Ista International GmbH | Class 2 | 15mm | 20mm |
| Ista Ultego III Eco | Landis & Gyr | Class 2 | 15mm | 20mm |
| Ista Ultego III Perfect | Landis & Gyr | Class 2 | 15mm | 100mm |
| Ista Ultego III Smart | Landis & Gyr | Class 2 | 15mm | 20mm |
| Itron CF51/55 Calculator | Itron | - | N/A | N/A |
| Itron CF Echo II | Itron | Class 2 | 15mm | 50mm |
| Itron CF UltramaXX V | Itron | Class 2 | 15mm | 20mm |
| Ultraheat UH50 (T550) | Landis & Gyr | Class 2 | 15mm | 100mm |
| Multical 302 | Kamstrup A/S | Class 2 | G3/4B (R1/2) | G1 B (R3/4) |
| Multical 402 | Kamstrup A/S | Class 2 | G3/4B (R1/2) | G2 B (R1 1/2) |
| Multical 602 with Ultraflow 54 | Kamstrup A/S | Class 2 | G3/4B (R1/2) | DN250 |
| Multical 801 with Ultraflow 54 | Kamstrup A/S | Class 2 | G3/4B (R1/2) | DN250 |
| Supercal 531 with Superstatic 440 | Sontex | Class 2 | G3/4B (R1/2) | DN500 flanged |
| Superstatic 449 with 449 integrator | Sontex | Class 2 | G3/4B (R1/2) | G1 B(R3/4) |
| Superstatic 749 | Sontex | Class 2 | 15mm | 20mm |
| T230 Ultraheat T230 | Landis & Gyr | Class 2 | 15mm | 20mm |