TNO NL and BSRIA UK: less heat transfer without a deaerator           The TNO and BSRIA have investigated how air can affect the efficiency of central heating systems and how a deaerator can benefit systems by optimising efficiency.           Based on the information in these reports, it can be concluded that air in a central heating system can sometimes cause considerable additional heat loss. Click here for a summary of the research carried out by the TNO and BSRIA.       Calculate savings   Cases