The Laars Heating Systems R0457501 Pool Heater HSI is a high-performance ignition control designed specifically for pool heaters. Operating at 120V, this unit uses Hot Surface Ignition (HSI) technology to provide reliable and efficient ignition of the pool heater. The HSI system ensures a quick and consistent start-up by utilizing a heated element to ignite the fuel, which enhances th... https://www.usapoolshop.com/r0457501-laars-heating-systems-pool-heater-hsi