We present the results of a new experiment with our multicell set-up implemented with mass spectrometric measurements of He-4 and a highly improved neutron detector. The excess heat measured is comparable with the results of other laboratories, but no neutrons were found and the tritium excess was lower than expected from the power excess. He-4 has been measured in the electrolysis gases and a tentative correlation of He-4 with excess power is presented and discussed.