Standby generators, or “gensets”, are used to power buildings in the event of an electric grid outage. As they are often needed to turn on within a matter of seconds, gensets utilize heaters to keep their engine blocks warm and at the ready. The conventional style of engine block heaters, called thermosiphon heaters, are simple and rely on natural convection alone to circulate coolant throughout the engine. While effective, the convection process requires a significant temperature gradient in the coolant loop in order to function properly. A newer type of block heating, called forced circulation, utilizes a pump to circulate coolant, rather than relying on convection alone. These heaters do not need to maintain such a large temperature gradient in the coolant loop, which can lead to lower average loop temperatures – and as a result, potential energy savings and less coolant system wear and tear.