Spain headquartered technology supplier SARRALLE is developing new technologies, based on the application of hydrogen in the steelmaking processes to reduce CO2 emissions and also to reduce production costs. One of the steelmaking processes that consume the most natural gas is the Reheating Furnace and SARRALLE has already started working on this process to ensure a process that is more adapted to the new challenges that they are already visualizing and that they will have to face in the following years.SARRALLE, within the framework of the H-ACERO project, is developing a reheating furnace prototype for the evaluation of hydrogen combustion technologies. The prototype allows the installation of various types of burners, including air-fired burner technologies, and oxy-combustion technologies, using both natural gas and hydrogen, or mixtures or both gases, as fuel. The burners to be evaluated will allow temperatures of 1200 degree Celsius to be reached in the combustion chamber.The transition from normal operation with natural gas and air, to oxy-combustion, represents a fuel saving of between 10-50% depending on the current operation of the equipment, with its consequent reduction in CO2 emissions. The introduction of hydrogen as fuel will mean an even greater reduction in CO2 emissions, with higher energy efficiency if oxygen is used as an oxidant. The presence of hydrogen as fuel, as well as the use of air or oxygen as an oxidizer, results in different concentrations of water vapor in the combustion atmosphere, as well as the modification of the CO & CO2 balances and the partial pressure of oxygen in the furnace.These new combustion atmospheres can produce changes in the refractory and in the steel that must be characterized and interpreted. The reheating furnace prototype that SARRALLE is developing enables the placement of various refractories, allowing their evaluation under different combustion atmospheres, as well as the placement of steel samples inside the combustion chamber for their evaluation. The equipment includes instrumentation for monitoring refractory temperatures at different points in the furnace, as well as the steel samples introduced into the combustion chamber. In addition, the equipment will have a vision camera that allows visualizing the development of the flame inside the chamber. It also allows the monitoring of the temperature and composition of the gases.