| Company name | Reg. code |
|---|---|
| HEAT3 OÜ (former name 3 Selli OÜ) | 11256808 |
| HEAT UP OÜ kustutatud | 12733660 |
| HEAT NRG OÜ | 12239195 |
| HEAT-EST OÜ | 14775532 |
| HIGH HEAT OÜ | 16123845 |
| OSCO HEAT OÜ | 12293674 |
| COZY HEAT OÜ | 14595758 |
| HEAT POWER OÜ | 12770401 |
| FOMAD HEAT OÜ | 16576096 |
| NORDIC HEAT OÜ kustutatud | 12502528 |
| HEAT BUILDER OÜ kustutatud | 11443315 |
| HEAT SERVICE OÜ | 12081558 |
| INVERTER HEAT OÜ | 16024994 |
| HEAT RECYCLERS OÜ | 12423266 |
| HEAT EXCHANGER OÜ kustutatud | 14776810 |
| HEAT SOLUTIONS OÜ | 16051672 |
| HEAT BY NATURE OÜ | 12522330 |
| VENTUS ECO HEAT OÜ (former name VENTUS Solar 1 OÜ) | 17060974 |
| HEAT-ENER GROUP OÜ | 12945616 |
| NORDIC HEAT GROUP OÜ kustutatud | 14774308 |
| VENTUS ELECTRICITY AND HEAT OÜ (former name VENTUS Electricity and Heat Atlasa OÜ) | 17180236 |
| HEAT AND ENERGY CONSULTING OÜ kustutatud | 12730755 |
| HEAT AND COOL CONSTRUCTIONS OÜ | 16774710 |
| VENTUS ELECTRICITY AND HEAT JUGLA OÜ (former name VENTUS Electricity and Heat 1 OÜ) | 17012252 |
| OILWORLD OÜ (former name SW Heat OÜ) | 14714246 |
| OPTIRAK EESTI OÜ (former name Heat and Light OÜ) | 11036946 |
| FROM HEAD TO HEAL OÜ kustutatud | 16900237 |
| 4HEAD OÜ kustutatud | 12669613 |
| HEART OÜ | 10242856 |
| HEAD OÜ | 11711661 |
| HEAP OÜ | 17339085 |
| TIM HEATH LANGUAGE AGENCY OÜ | 12422338 |
| HEA5 OÜ | 12749269 |
| HEAD RIIMID OÜ | 12180852 |
| WILD HEART OÜ | 17447573 |
| HEAD KARDINAD OÜ kustutatud | 11914909 |
| HEAD INVESTMENTS OÜ | 14009401 |
| MIDAGI HEAD OÜ | 17179530 |
| T-HEAD OÜ | 14593328 |
| HEAD JUHID OÜ | 14372768 |
| HEAD ARSTID OÜ | 10980376 |
| HEAD KONTSERDID OÜ | 16716462 |
| HEART PRINT OÜ | 17115492 |
| HEAD CAPITAL OÜ | 14010999 |
| HEAD NÕUANDED OÜ | 12326244 |
| MISKIT HEAD OÜ kustutatud | 14291219 |
| HEAD IDEED OÜ | 16291407 |
| KÕIKE HEAD OÜ kustutatud | 12718665 |
| HEART NAMASTE OÜ | 12407617 |
| HEAL US OÜ | 16687878 |