| Hitte s.r.o. | 04888871 | Lomnice | 9 March 2016 | Active |
| KOVARSON s.r.o. | 29220327 | Vsetín | 14 May 2010 | Active |
| TOMTON s.r.o. | 28614836 | Velké Albrechtice | 25 February 2010 | Active |
| CSTfire s.r.o. | 28607520 | Ostrava | 2 December 2009 | Active |
| BOKI Energy s.r.o. | 26111799 | Praha | 1 November 2006 | Ceased |
| SDS, HLINA & MALÝ s.r.o. | 27663949 | Brno | 19 November 2005 | Active |
| Hořáky Třebíč, spol. s r.o. | 26966310 | Třebíč | 14 May 2005 | Active |
| METAL -STYL, s.r.o. | 26950278 | Hodonín | 17 December 2004 | Active |
| Lersen CZ s.r.o. | 25480596 | Hrádek nad Nisou | 6 January 2004 | Active |
| ZEMONT Přeštice s.r.o. | 26352851 | Příchovice | 16 December 2002 | Active |
| KOVOS KOTLE s.r.o. | 25405730 | Teplice | 17 August 1999 | Active |
| CHEMITERM-PECE-CZ,s.r.o. | 25744739 | Praha | 10 March 1999 | Active |
| Unigaz servis s.r.o. | 25623010 | Praha | 12 November 1997 | Active |
| ISAN Radiátory s.r.o. | 25334727 | Brno | 16 April 1997 | Active |
| N.D.B. plyn s.r.o. "v likvidaci" | 25370880 | Krnov | 7 April 1997 | Active |
| KORADO, a.s. | 25255843 | Česká Třebová | 1 September 1996 | Active |
| AQUATERM, s.r.o. | 25301381 | Šlapanice | 5 June 1996 | Active |
| INKRUSTA spol. s r.o. | 63493217 | Vizovice | 29 January 1996 | Active |
| ELTOP - elektrické vytápění, spol.s r.o., v likvidaci | 64944123 | Praha | 15 January 1996 | Ceased |
| ZT METAL a.s. | 64830837 | Kralovice | 11 January 1996 | Active |
| SLOKOV kovo a.s. | 60752564 | Moravský Písek | 22 May 1995 | Active |
| FEROSTAV, a.s. | 63078937 | Praha | 14 April 1995 | Active |
| S-Montáže s.r.o. | 60715383 | Brno | 26 July 1994 | Active |
| ZIKÁN a spol., s.r.o. | 60933011 | Česká Třebová | 1 April 1994 | Active |
| Nordic Group Central Europe s.r.o. | 60489014 | Praha | 10 March 1994 | Active |
| THERMO 2000, spol. s r.o. | 60467037 | Praha | 22 February 1994 | Active |
| REGULUS Production s.r.o. | 49904434 | Stráž nad Nisou | 8 February 1994 | Active |
| LICON s.r.o. | 60462183 | Stráž nad Nisou | 27 January 1994 | Active |
| REGULUM spol. s r.o. | 60471107 | Praha | 10 January 1994 | Active |
| FINBOSI v.o.s. | 49449834 | Brno | 14 October 1993 | Active |
| OPOP spol. s r. o. | 47674105 | Valašské Meziříčí | 30 September 1993 | Ceased |
| SIMPO-MH s.r.o. - v likvidaci | 49444433 | Uherské Hradiště | 6 September 1993 | Ceased |
| THERMO-KOV, spol. s r.o. | 48362115 | Kdyně | 2 July 1993 | Active |
| AZ TOPENÁŘI, spol. s r.o. | 48909840 | Brno | 24 June 1993 | Active |
| O´papa s.r.o. | 48538248 | Praha | 9 April 1993 | Active |
| ITEVO, spol. s r.o. | 47906651 | Brno | 8 February 1993 | Active |
| TACHOS, s.r.o. v likvidaci | 48173576 | Příkrý | 21 January 1993 | Ceased |
| INVENCE s.r.o. | 48039918 | Praha | 9 December 1992 | Active |
| O P K a , společnost s r.o., v likvidaci | 47286776 | Stráž pod Ralskem | 2 September 1992 | Active |
| PONAST spol. s r. o. | 47678232 | Valašské Meziříčí | 27 August 1992 | Active |
| INTOP, s.r.o. v likvidaci | 45793760 | Praha | 14 July 1992 | Ceased |
| JAGA N.V. - organizační složka | 42729548 | Hostivice | 13 May 1992 | Active |
| EKOEFEKT a.s. | 40232697 | Veltruby | 1 January 1992 | Active |
| ENE-M.A., s.r.o. v likvidaci | 44222181 | Jablonec nad Nisou | 31 December 1991 | Active |
| SDRUŽENÍ TOPENÁŘŮ, spol. s r.o. | 44796684 | Praha | 19 December 1991 | Active |
| Energo-Engineering, spol. s r.o. "v likvidaci" | 44743459 | Ostrava | 18 December 1991 | Active |
| T O P E K O , spol. s r.o. v likvidaci | 15031993 | Provodov-Šonov | 16 December 1991 | Ceased |
| ETRA, s.r.o. v likvidaci | 43000452 | Praha | 4 December 1991 | Ceased |
| Svoboda a spol. | 42195853 | Hradec Králové | 1 December 1991 | Active |
| EKOS MIMOŇ spol. s r.o. | 41328663 | Mimoň | 5 August 1991 | Active |