UTICA BOILERS Hotline Indirect Water Heater offers twice the recovery of a standard gas-fired water heater and four times the recovery of an electric water heater, providing a continuous supply of hot water. Its counterflow design increases heat transfer by 50% for better temperature mixing. The unique, smooth tube heating coil resists lime buildup, extending the heater's lifespan. The steel coil enhances heat transfer for faster recovery, eliminating the worry of running out of hot water.