The controls are all built-in and a daily charge period can be set to work with either “time of use -smart meter” or “controlled load” off-peak power. Solar as well! Heatboss has a second daily charging period available that can use your peak solar production times if you have solar panels and a smart meter. You can then adjust the amount of daily charge based on your house Solar PV usage. Optimise the solar energy going into the heater and top up overnight with lower-cost “time-of-use’ power from the grid. All Heatpac storage heaters have a very dense ceramic core that is heated by resistive elements whenever power is available. Great for bedrooms, offices and smaller living areas.