The heat from the lava may also heat the ground and this stored heat can be radiated at a later time. The bottom line is that over very long periods of time, the slow burners such as Kilauea and the Virunga volcanoes win out over the big explosive volcanoes. Lava carries the large part of the heat, but a bubbling lava lake or even a lava dome can emit a lot of heat without actually having to erupt the lava.