Manuals Brands Horstmann Thermostats Horstmann Thermostats Manuals ProdManuals has more than 12 Horstmann Thermostats manual(s) covering 12 model(s). 4 C H T Models Document Type 4 425 Tiara C CentaurPlus C27 CentaurPlus C17 ChannelPlus H37XL Series 2 ChannelPlus H21XL CentaurStat H HRT4 HCT2 HRT3 Mechanical Room HTT4 Tamper Proof HFT4 Frost Protection T ThermoPlus