Flue type gas water heater: Capacity from 6-20L, color can be customized, have metal panel and glass panel, the ignition method: with 3V*2 battery or 5V USB connection, LOGO can be customized; Force exhaust type gas water heater: Capacity from 8-20L, with single layer chimney pipe, LOGO can be customized, electric ignition ; Balance type gas water heater: Capacity 10L/12L are available, with double layer chimney pipe, LOGO can be customized,electric ignition; Constant temperature gas water heater: Capacity 12L/14L/16L/18L are available, with double layer chimney pipe, LOGO can be customized,electric ignition.