4.2L capacity Auto feed Hot water/Boiler dispenser with keep Warm Function and Automatically Re-boil. Both inner/outer shell are using stainless steel Micro-computer PCB with function of 1. Electric pumping with 2 stages of water feed to prevent hot water splashing. The 1st stage is low volume water feed in 3 Sec and 2nd stage is after 3 second with regular water feed. 2. Three water temperature setting plus warm keeing. 3. Safty: dry-boiled protection.