Taco’s FuelMizer outdoor reset switching relay is a microprocessor-based control designed to regulate the supply water temperature of a single boiler based on the outdoor temperature. With reduced supply water temperatures, substantial energy savings are achieved. The FuelMizer is a boiler reset control and switching relay in one unit and is ideal for retrofits, but may be used for new installations. Including functions such as automatic reset, ratio calculation, warm weather shutdown, minimum boiler temperature settings and boiler differential settings, the FuelMizer’s control monitors both boiler and outdoor sensors. It is capable of controlling a system or zone valve circulator as well as overriding outdoor resets when a DHW tank calls for heat. Typical energy savings are about 14%, though some customers have experienced up to 30% reductions in energy used once the FuelMizer is installed.