Key Players Covered Some of the notable companies in the global heat meter market are Sycous Limited, Zenner International GmbH Co. KG, Kamstrup, Danfoss, Apator SA., B Meters, Itron, Diehl Stiftung Co. KG, Siemens, Trend Control Systems Ltd, Premier Control Technologies Ltd, Cosmic Technologies, Grundfos, Spire Metering Technology, Omni Instruments, and Xi'an Kacise Optronics Tech Co., Ltd.