In 2013 the Eco Design and Energy Labelling directives for water heaters and for space- and combination heaters came into force as regulations. Additionally, there is the option for “package labels” allowing for various combinations of e.g. solar collectors, boilers and storage tanks to be labelled by the supplier or the dealer. The package is then rated by means of energy calculations based on component data. In late 2013 SP Technical Research Institute of Sweden on behalf of the Swedish Energy Agency conducted a series of tests on five different hot water storage tanks available on the Swedish market for single-family houses. The objectives were to assess the feasibility of the transitional methods for storage testing and to provide an overview of the compliance of storage tanks on the Swedish market compared to the upcoming regulations. The tests were performed according to requirements for hot water stores as well as according to those for water heaters. Results point out some problems with the current methodology and show a need for improvement of tank performance for the tested models as only one out of five tanks got a rating C or better thus complying with the minimum requirements set by the regulation.