We require a heating engineer to inspect our heating system, as the radiators are only getting lukewarm rather than heating up properly. The thermostat is an older model, as shown in the attached photograph. However, the batteries have recently been replaced, and the thermostat appears to be functioning. Despite this, the radiators are not reaching the desired temperature, and the property is not heating adequately. We would appreciate an engineer attending to diagnose the issue as to why the radiators are lukewarm and ensure they are hot.