Dual-fuel series of the initial industrial level for medium-power heat generators. It runs on natural gas and diesel fuel, switching via the built—in automation unit, without reconfiguration. Three standard sizes from 100 to 581 kW.

| Manufacturer | ExEco |
| Series | RLS 28-50 |
| Burner type | Monoblock, two-stage, gas and diesel fuel |
| Heat output | 100-581 kW |
| Fuel type | Natural gas and diesel fuel |
| Control type | Two-stage for gas and liquid fuel |
| Number of sizes | 3 |
| Power supply | 230/1/50, 400/3/50 V/phase/Hz |
| Noise level | 68-72 dB |
| Ambient temperature | from 0 to +50 °C |
| Electrical protection rating | IP44 |
| Control system | Microprocessor control and safety unit with fault diagnostics |
| Connection | Flanged, with heat shield and fixing kit |
| Scope of supply | Burner, nozzles, fuel filter, flexible fuel hoses, gasket, heat shield, fixings, data sheet and manual |
| Model | Heat output, kW | Power supply, V/phase/Hz |
| RLS 28 | 100/163÷325 | 230/1/50 |
| RLS 38 | 116/232÷442 | 230/1/50 |
| RLS 50 | 145/290÷581 | 400/3/50 |
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