How can I calculate the water volume in heating and cooling systems? October 14, 2021 By Every building has its own characteristics so that water volume cannot be calculated by looking m² only. There are several methods which can be used to calculate the volume of water in a hydronic heating or cooling systems. However, these methods are not always 100% accurate due to inaccurate or incomplete systems information and variations in measurement techniques. Consequently, we recommend to use at least two methods at the same time for accuracy. For full details ask for Water Calculation Document from your distributor/reseller in your territory or contact email@example.com.