1. Viessmann Climate Solutions SE.
2. Vaillant Group UK Limited
3. Daikin Airconditioning UK Ltd.
4. Hitachi Europe Ltd.
5. Robert Bosch UK Holdings Limited
6. NIBE Energy Systems Limited
7. Samsung Electronics (UK) Limited
8. Trane UK Limited
9. Aermec UK Ltd
10. Mitsubishi Electric Europe B.V.